Print this diamond

Question

This question has been spreading like a virus in my office. There are quite a variety of approaches:

Print the following:

        1
       121
      12321
     1234321
    123454321
   12345654321
  1234567654321
 123456787654321
12345678987654321
 123456787654321
  1234567654321
   12345654321
    123454321
     1234321
      12321
       121
        1

Answers are scored in characters with fewer characters being better.

What is the winning criterion ? And is this a challenge or a golf ? — Paul R, Oct 12 '12 at 15:33
@DavidCarraher "kolmogorov-complexity" was edited in after the question was asked. The original questioner has not specified the winning criteria yet. — Gareth, Oct 12 '12 at 20:56
@Gareth My comment was made after the "kolmogorov-complexity" tag was added but before the "code-golf" tag was added. At that time people were still be asking whether it was a code-golf question. — DavidC, Oct 12 '12 at 22:00

Community · Accepted Answer · 2020-06-17 09:04:33Z

26

J, 29 26 24 23 22 21 chars

,.(0&<#":)"+9-+/~|i:8

Thanks to FUZxxl for the "+ trick (I don't think I've ever used u"v before, heh).

Explanation

                  i:8  "steps" vector: _8 _7 _6 ... _1 0 1 ... 7 8
                 |     magnitude
              +/~      outer product using +
            9-         inverts the diamond so that 9 is in the center
  (      )"+           for each digit:
      #                  copy
   0&<                   if positive then 1 else 0
       ":                copies of the string representation of the digit
                         (in other words: filter out the strictly positive
                          digits, implicitly padding with spaces)
,.                     ravel each item of the result of the above
                       (necessary because the result after `#` turns each
                        scalar digit into a vector string)

edited Jun 17 '20 at 9:04

Community♦

1

answered Feb 8 '14 at 19:18

FireFly

7,17724 silver badges40 bronze badges

\$\begingroup\$ Instead of "0], write "+. \$\endgroup\$ – FUZxxl Apr 11 '15 at 10:26
\$\begingroup\$ For one less character, write ,.0(<#":)"+9-+/~|i:8 \$\endgroup\$ – FUZxxl Apr 11 '15 at 13:24
1

\$\begingroup\$ Here is your solution translated to 25 characters of APL: ⍪↑{(0<⍵)/⍕⍵}¨9-∘.+⍨|9-⍳17 \$\endgroup\$ – FUZxxl Apr 11 '15 at 13:44
\$\begingroup\$ This here is peak J \$\endgroup\$ – Jonah Oct 4 '20 at 14:37

add a comment |

marinus · Accepted Answer · 2012-10-14 21:13:34Z

APL (33 31)

A⍪1↓⊖A←A,0 1↓⌽A←⌽↑⌽¨⍴∘(1↓⎕D)¨⍳9

If spaces separating the numbers are allowed (as in the Mathematica entry), it can be shortened to 28 26:

A⍪1↓⊖A←A,0 1↓⌽A←⌽↑⌽∘⍕∘⍳¨⍳9

Explanation:

(Long program:)
⍳9: a list of the numbers 1 to 9
1↓⎕D: ⎕D is the string '0123456789', 1↓ removes the first element
⍴∘(1↓⎕D)¨⍳9: for each element N of ⍳9, take the first N elements from 1↓⎕D. This gives a list: ["1", "12", "123", ... "123456789"] as strings
⌽¨: reverse each element of this list. ["1", "21", "321"...]
(Short program:)
⍳¨⍳9: the list of 1 to N, for N [1..9]. This gives a list [[1], [1,2], [1,2,3] ... [1,2,3,4,5,6,7,8,9]] as numbers.
⌽∘⍕∘: the reverse of string representation of each of these lists. ["1", "2 1"...]
(The same from now on:)
A←⌽↑: makes a matrix from the list of lists, padding on the right with spaces, and then reverse that. This gives the upper quadrant of the diamond. It is stored in A.
A←A,0 1↑⌽A: A, with the reverse of A minus its first column attached to the right. This gives the upper half of the rectangle. This is then stored in A again.
A⍪1↓⊖A: ⊖A is A mirrored vertically (giving the lower half), 1↓ removes the top row of the lower half and A⍪ is the upper half on top of 1↓⊖A.

Shouldn't non-ascii code be counted in UTF-8 instead of code-points? This would push APL closer to his earthly relatives. — John Dvorak, Mar 23 '13 at 5:39
@JanDvorak No, since there is an APL code page, which fits the entire character set into a single byte. But I think you've probably figured this out at some point since 2013. ;) — Martin Ender, Jan 25 '15 at 0:34

Community · Accepted Answer · 2020-06-17 09:04:33Z

Clojure, 191 179 bytes

#(loop[[r & s](range 18)h 1](print(apply str(repeat(if(< r 8)(- 8 r)(- r 8))\ )))(doseq[m(concat(range 1 h)(range h 0 -1))](print m))(println)(if s(recur s((if(< r 8)inc dec)h))))

-12 bytes by changing the outer doseq to a loop, which allowed me to get rid of the atom (yay).

A double "for-loop". The outer loop (loop) goes over each row, while the inner loop (doseq) goes over each number in the row, which is in the range (concat (range 1 n) (range n 0 -1)), where n is the highest number in the row.

(defn diamond []
  (let [spaces #(apply str (repeat % " "))] ; Shortcut function that produces % many spaces
    (loop [[row-n & r-rows] (range 18) ; Deconstruct the row number from the range
           high-n 1] ; Keep track of the highest number that should appear in the row
      (let [top? (< row-n 8) ; Are we on the top of the diamond?
            f (if top? inc dec) ; Decided if we should increment or decrement
            n-spaces (if top? (- 8 row-n) (- row-n 8))] ; Calculate how many prefix-spaces to print
        (print (spaces n-spaces)) ; Print prefix-spaces
        (doseq [m (concat (range 1 high-n) (range high-n 0 -1))] ; Loop over the row of numbers
          (print m)) ; Print the number
        (println)

        (if r-rows
          (recur r-rows (f high-n)))))))

Due to a bug in the logic in my first attempt (accidentally inserting the prefix-spaces between each number instead), I managed to get this:

1
1       2       1
1      2      3      2      1
1     2     3     4     3     2     1
1    2    3    4    5    4    3    2    1
1   2   3   4   5   6   5   4   3   2   1
1  2  3  4  5  6  7  6  5  4  3  2  1
1 2 3 4 5 6 7 8 7 6 5 4 3 2 1
12345678987654321
1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 1
1  2  3  4  5  6  7  8  9  8  7  6  5  4  3  2  1
1   2   3   4   5   6   7   8   7   6   5   4   3   2   1
1    2    3    4    5    6    7    6    5    4    3    2    1
1     2     3     4     5     6     5     4     3     2     1
1      2      3      4      5      4      3      2      1
1       2       3       4       3       2       1
1        2        3        2        1
1         2         1

Not even correct ignoring the obvious bug, but it looked cool.

Community · Accepted Answer · 2020-06-17 09:04:33Z

20

Mathematica 83 49 43 54 51

Print@@#&/@(Sum[k~DiamondMatrix~17,{k,0,8}]/.0->" ")

formatting improved

With 3 bytes saved thanks to Kelly Lowder.

Analysis

The principal part of the code, Sum[DiamondMatrix[k, 17], {k, 0, 8}], can be checked on WolframAlpha.

The following shows the underlying logic of the approach, on a smaller scale.

a = 0~DiamondMatrix~5;
b = 1~DiamondMatrix~5;
c = 2~DiamondMatrix~5;
d = a + b + c;
e = d /. 0 -> "";
Grid /@ {a, b, c, d, e}

grids

edited Jun 17 '20 at 9:04

Community♦

1

answered Oct 12 '12 at 16:53

DavidC

24.8k2 gold badges48 silver badges104 bronze badges

1

\$\begingroup\$ David, you beat me this time! :-) \$\endgroup\$ – Mr.Wizard Oct 21 '12 at 15:29
1

\$\begingroup\$ Another try (55 chars): f = Table[# - Abs@k, {k, -8, 8}] &; f[f[9]] /. n_ /; n < 1 -> "" // Grid \$\endgroup\$ – DavidC Mar 22 '13 at 17:56
\$\begingroup\$ Still another (71 chars): Table[9 - ManhattanDistance[{9, 10}, {j, k}], {j, 18}, {k, 18}] /. n_ /; n < 1 -> "" // Grid \$\endgroup\$ – DavidC Mar 22 '13 at 17:57
2

\$\begingroup\$ Grid@#@#@9&[Table[#-Abs@k,{k,-8,8}]&]/.n_/;n<1->"" 50 chars. \$\endgroup\$ – chyanog Mar 23 '13 at 4:26
\$\begingroup\$ A visual display of the code: ArrayPlot[Sum[k~DiamondMatrix~17, {k, 0, 8}], AspectRatio -> 2] \$\endgroup\$ – DavidC Nov 23 '13 at 15:53

| show 2 more comments

Community · Accepted Answer · 2020-06-17 09:04:33Z

17

Python 2, 72 69 67 61

Not clever:

s=str(111111111**2)
for i in map(int,s):print'%8s'%s[:i-1]+s[-i:]

edited Jun 17 '20 at 9:04

Community♦

1

answered Oct 12 '12 at 17:54

Steven Rumbalski

1,4328 silver badges10 bronze badges

2

\$\begingroup\$ doesn't work in Python 3+, which requires parens around the arguments to print :( \$\endgroup\$ – Griffin Oct 12 '12 at 18:27
9

\$\begingroup\$ @Griffin: In code golf I choose Python 2 or Python 3 depending on whether I need print to be a function. \$\endgroup\$ – Steven Rumbalski Oct 12 '12 at 19:29
5

\$\begingroup\$ s=`0x2bdc546291f4b1` \$\endgroup\$ – gnibbler Oct 14 '12 at 1:32
1

\$\begingroup\$ @gnibbler. Very clever suggestion. Unfortunately, the repr of that hexadecimal includes a trailing 'L'. \$\endgroup\$ – Steven Rumbalski Oct 15 '12 at 14:51
1

\$\begingroup\$ @gnibbler: This works in Python running on 64-bit platforms, but not on 32-bit platforms. \$\endgroup\$ – Konrad Borowski Dec 31 '13 at 8:06

| show 1 more comment

baby-rabbit · Accepted Answer · 2012-10-19 02:53:21Z

14

C, 79 chars

v;main(i){for(;i<307;putchar(i++%18?v>8?32:57-v:10))v=abs(i%18-9)+abs(i/18-8);}

answered Oct 19 '12 at 2:53

baby-rabbit

1,6239 silver badges9 bronze badges

4

\$\begingroup\$ Explanation please? \$\endgroup\$ – Lucas Henrique Apr 12 '15 at 16:35
1

\$\begingroup\$ @LucasHenrique 307 characters total. i%18-9 is x value on cartesian plane mirroring itself on the y-axis. i/18-8 is y value on cartesian plane mirroring itself on the x-axis. Sum them together to get 1:1 diagonal (which causes numeric shift to form on 1:1 diamond. (32:57)-v is unichar numeric value for ASCII 0-9. 10 new line. \$\endgroup\$ – Albert Renshaw Feb 14 '17 at 9:13

add a comment |

mbomb007 · Accepted Answer · 2017-02-13 00:07:50Z

14

Python 2, 60 59

for n in`111111111**2`:print`int('1'*int(n))**2`.center(17)

Abuses backticks and repunits.

edited Feb 13 '17 at 0:07

mbomb007

22.4k5 gold badges53 silver badges129 bronze badges

answered Oct 22 '12 at 18:41

nneonneo

11.7k6 gold badges25 silver badges48 bronze badges

\$\begingroup\$ The space after in keyword can be removed, just like you did with print keyboard. \$\endgroup\$ – Konrad Borowski Oct 23 '12 at 17:02
\$\begingroup\$ @GlitchMr: Thanks! Updated. \$\endgroup\$ – nneonneo Oct 23 '12 at 17:06
\$\begingroup\$ I get an extra L in the middle seven lines of output. \$\endgroup\$ – Steven Rumbalski Mar 28 '13 at 14:56
\$\begingroup\$ You shouldn't...what version of Python are you using? \$\endgroup\$ – nneonneo Mar 28 '13 at 15:07

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Community · Accepted Answer · 2020-06-17 09:04:33Z

12

GolfScript, 33 31 30 characters

Another GolfScript solution

17,{8-abs." "*10@-,1>.-1%1>n}%

Thank you to @PeterTaylor for another char.

Previos versions:

17,{8-abs" "*9,{)+}/9<.-1%1>+}%n*

(run online)

17,{8-abs" "*9,{)+}/9<.-1%1>n}%

edited Jun 17 '20 at 9:04

Community♦

1

answered Oct 12 '12 at 17:15

Howard

23.3k2 gold badges39 silver badges81 bronze badges

1

\$\begingroup\$ You don't need the trailing spaces (the text in the question doesn't have them), so you can skip adding the numbers to the spaces and save one char as 17,{8-abs." "*10@-,1>.-1%1>n}% \$\endgroup\$ – Peter Taylor Mar 28 '13 at 16:21

add a comment |

chyanog · Accepted Answer · 2014-01-08 06:18:10Z

12

Mathematica 55 50 45 41 38

(10^{9-Abs@Range[-8,8]}-1)^2/81//Grid

Grid[(10^Array[{9}-Abs[#-9]&,17]-1)^2/81]

Mathematica graphics

edited Jan 8 '14 at 6:18

answered Mar 22 '13 at 15:58

chyanog

1,1787 silver badges15 bronze badges

1

\$\begingroup\$ Very nice work. \$\endgroup\$ – DavidC Mar 22 '13 at 17:17
\$\begingroup\$ @DavidCarraher Thank you :D \$\endgroup\$ – chyanog Mar 23 '13 at 4:05
\$\begingroup\$ I echo David's remark. How did you come up with this? \$\endgroup\$ – Mr.Wizard Mar 27 '13 at 7:02
\$\begingroup\$ May I update your answer with the shorter modification I wrote? \$\endgroup\$ – Mr.Wizard Mar 27 '13 at 21:49
\$\begingroup\$ @Mr.Wizard Certainly. \$\endgroup\$ – chyanog Mar 28 '13 at 4:16

| show 1 more comment

Community · Accepted Answer · 2020-06-17 09:04:33Z

11

Javascript, 114

My first entry on Codegolf!

for(l=n=1;l<18;n-=2*(++l>9)-1,console.log(s+z)){for(x=n,s="";x<9;x++)z=s+=" ";for(x=v=1;x<2*n;v-=2*(++x>n)-1)s+=v}

If this can be shortened any further, please comment :)

edited Jun 17 '20 at 9:04

Community♦

1

answered Oct 20 '12 at 17:10

tomsmeding

2,04414 silver badges20 bronze badges

\$\begingroup\$ damn it!! I missed the space and made half diamond. I must sleep now \$\endgroup\$ – Joomler Nov 23 '16 at 12:41

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Gareth · Accepted Answer · 2012-10-13 10:33:20Z

9

PHP, 92 90 characters

<?for($a=-8;$a<9;$a++){for($b=-8;$b<9;){$c=abs($a)+abs($b++);echo$c>8?" ":9-$c;}echo"\n";}

Calculates and prints the Manhattan distance of the position from the centre. Prints a space if it's less than 1.

An anonymous user suggested the following improvement (84 characters):

<?for($a=-8;$a<9;$a++,print~õ)for($b=-8;$b<9;print$c>8?~ß:9-$c)$c=abs($a)+abs($b++);

edited Oct 13 '12 at 10:33

answered Oct 12 '12 at 15:55

Gareth

11.9k1 gold badge31 silver badges81 bronze badges

\$\begingroup\$ 2nd one doesn't work. \$\endgroup\$ – Christian Mar 22 '13 at 4:30
\$\begingroup\$ I know it's very late, but I always have a need to golf when I see PHP scripts. 83 bytes with <? skipped per meta. Also, you seem to have some encoding problems in the second code. \$\endgroup\$ – RedClover May 26 '18 at 18:56
\$\begingroup\$ @Soaku The second one is not mine. It was suggested as an edit to my answer by an anonymous user. I just added it without checking - not really sure why the user didn't just post it as their own attempt really. The meta question post-dates this answer by almost 3 years. \$\endgroup\$ – Gareth May 26 '18 at 19:43
\$\begingroup\$ I meant, that I don't include <? in the bytecount. I've made some other improvements too. \$\endgroup\$ – RedClover May 26 '18 at 19:58

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Strigoides · Accepted Answer · 2012-10-14 02:31:14Z

Common Lisp, 113 characters

(defun x(n)(if(= n 0)1(+(expt 10 n)(x(1- n)))))(dotimes(n 17)(format t"~17:@<~d~>~%"(expt(x(- 8(abs(- n 8))))2)))

First I noticed that the elements of the diamond could be expressed like so:

  1   =   1 ^ 2
 121  =  11 ^ 2
12321 = 111 ^ 2

etc.

x recursively calculates the base (1, 11, 111, etc), which is squared, and then printed centered by format. To make the numbers go up to the highest term and back down again I used (- 8 (abs (- n 8))) to avoid a second loop

DLosc · Accepted Answer · 2016-11-23 04:38:09Z

8

Charcoal (non-competing), 13 bytes

Not competing because the language is (much) newer than the question.

Ｆ⁹«ＧX⁻⁹ιＩ⁺ι¹→

Try it online!

How?

Draws nine, successively smaller, concentric number-diamonds on top of each other:

Ｆ⁹«   Loop ι from 0 to 8:
ＧX     Draw a (filled) polygon with four equilateral diagonal sides
⁻⁹ι      of length 9-ι
Ｉ⁺ι¹    using str(ι+1) as the character
→       Move right one space before drawing the next one

answered Nov 23 '16 at 4:38

DLosc

23.1k3 gold badges43 silver badges100 bronze badges

5

\$\begingroup\$ This should be now competing as per new consensus in meta. \$\endgroup\$ – officialaimm Sep 13 '17 at 8:16
\$\begingroup\$ The output is incorrect. \$\endgroup\$ – Makonede Jan 18 at 17:01

add a comment |

copy · Accepted Answer · 2013-03-23 01:02:22Z

7

JavaScript, 81

for(i=9;--i+9;console.log(s))for(j=9;j;s=j--^9?k>0?k+s+k:" "+s:k+"")k=i<0?j+i:j-i

answered Mar 23 '13 at 1:02

copy

6,6167 gold badges28 silver badges38 bronze badges

\$\begingroup\$ Running this in my browser shows the diamond, but on an additional line a -7 \$\endgroup\$ – Christiaan Westerbeek Jul 8 '20 at 22:23

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Community · Accepted Answer · 2020-06-17 09:04:33Z

Vim, 62 39 38 keystrokes

Thanks to @DJMcMayhem for saving a ton of bytes!

My first Vim answer, so exciting!

i12345678987654321<ESC>qqYP9|xxI <ESC>YGpHq7@q

I tried to write the numbers via a recording, but it is much longer

Try it online!

Explanation:

i123 ... 321<ESC>                   Write this in insert mode and enter normal mode
qq                                  Start recording into register q
  YP                                Yank this entire line and Paste above
    9|                              Go to the 9th column
      xx                            Delete character under cursor twice
        I <ESC>                     Go to the beginning of the line and insert a space and enter normal mode
               Y                    Yank this entire line
                G                   Go to the last line
                 p                  Paste in the line below
                  H                 Go to the first line
                   q                End recording
                    7@q             Repeat this 7 times

EDIT:

I used H instead of gg and saved 1 byte

You can delete the ma and change `ai<space> to I<space>. — James, Dec 4 '16 at 20:20
Also, you could probably delete stage 3 if you change stage 1 to pasting above and below. — James, Dec 4 '16 at 20:21
@DJMcMayhem Thank you for the suggestion! I initially was thinking about introducing a new register for the copied bits, but this is much shorter! — user41805, Dec 5 '16 at 8:37

Shaggy · Accepted Answer · 2017-07-04 13:19:20Z

PowerShell (2 options): 92 84 45 bytes

1..8+9..1|%{' '*(9-$_)+[int64]($x='1'*$_)*$x}
1..9+8..1|%{' '*(9-$_)+[int64]($x='1'*$_)*$x}

Thanks to Strigoides for the hint to use 1^2,11^2,111^2...

Shaved some characters by:

Eliminating $w.

Nested the definition of $x in place of its first use.

Took some clues from Rynant's solution:

Combined the integer arrays with + instead of , which allows elimination of the parenthesis around the arrays and a layer of nesting in the loops.

Used 9-$_ to calculate the length of spaces needed, instead of more complicated maths and object methods. This also eliminated the need for $y.

Explanation:

1..8+9..1 or 1..9+8..1 generates an array of integers ascending from 1 to 9 then descending back to 1.

|%{...} pipes the integer array into a ForEach-Object loop via the built-in alias %.

' '*(9-$_)+ subtracts the current integer from 9, then creates a string of that many spaces at the start of the output for this line.

[int64]($x='1'*$_)*$x defines $x as a string of 1s as long as the current integer is large. Then it's converted to int64 (required to properly output 111111111² without using E notation) and squared.

enter image description here

You can save a byte by casting to a long instead of int64 — Veskah, Jul 26 '18 at 20:50
Another way to save a byte 1..8+9..1|%{' '*(9-$_)+ +($x='1'*$_+'L')*$x} — mazzy, Sep 19 '18 at 12:12

ngn · Accepted Answer · 2018-09-19 13:05:37Z

APL (Dyalog Classic), 20 19 bytes

(⍉⊢⍪1↓⊖)⍣2⌽↑,⍨\1↓⎕d

Try it online!

⎕d are the digits '0123456789'

1↓ drop the first ('0')

,⍨\ swapped catenate scan, i.e. the reversed prefixes '1' '21' '321' ... '987654321'

↑ mix into a matrix padded with spaces:

⌽ reverse the matrix horizontally

(...)⍣2 do this twice:

⍉⊢⍪1↓⊖ the transposition (⍉) of the matrix itself (⊢) concatenated vertically (⍪) with the vertically inverted matrix (⊖) without its first row (1↓)

Paolo · Accepted Answer · 2012-10-14 10:40:23Z

4

R, 71 characters

For the records:

s=c(1:9,8:1);for(i in s)cat(rep(" ",9-i),s[0:i],s[(i-1):0],"\n",sep="")

answered Oct 14 '12 at 10:40

Paolo

6965 silver badges9 bronze badges

\$\begingroup\$ +1 - can save a few with message(rep(" ",9-i),s[c(1:i,i:1-1)]) \$\endgroup\$ – flodel Apr 11 '15 at 17:14
\$\begingroup\$ @flodel you'd have to note that that prints to stderr, and you could also do for(i in s<-c(1:9,8:1))... to save a byte \$\endgroup\$ – Giuseppe Dec 14 '17 at 17:10
\$\begingroup\$ 64 bytes \$\endgroup\$ – Giuseppe Apr 6 '18 at 21:05

add a comment |

skeevey · Accepted Answer · 2012-10-18 18:06:02Z

4

k (64 50 chars)

-1'(::;1_|:)@\:((|!9)#'" "),'$i*i:"J"$(1+!9)#'"1";

Old method:

~~-1',/(::;1_|:)@\:((|!9)#\:" "),',/'+(::;1_'|:')@\:i#\:,/$i:1+!9;~~

edited Oct 18 '12 at 18:06

answered Oct 12 '12 at 16:40

skeevey

4,19715 silver badges21 bronze badges

\$\begingroup\$ (1+!9)#'"1" is ,\9#"1" \$\endgroup\$ – ngn Dec 5 '16 at 22:42

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Martin Ender · Accepted Answer · 2015-01-25 00:32:28Z

CJam, 31 27 bytes

CJam is a lot newer than this challenge, so this answer is not eligible for being accepted. This was a neat little Saturday evening challenge, though. ;)

8S*9,:)+9*9/2%{_W%1>+z}2*N*

Test it here.

The idea is to form the upper left quadrant first. Here is how that works:

First, form the string " 123456789", using 8S*9,:)+. This string is 17 characters long. Now we repeat the string 9 times, and then split it into substrings of length 9 with 9/. The mismatch between 9 and 17 will offset every other row one character to the left. Printing each substring on its own line we get:

So if we just drop every other row (which conveniently works by doing 2%), we obtain one quadrant as desired:

Finally, we mirror this twice, transposing the grid in between to ensure that the two mirroring operations go along different axes. The mirroring itself is just

_      "Duplicate all rows.";
 W%    "Reverse their order.";
   1>  "Discard the first row (the centre row).";
     + "Add the other rows.";

Lastly, we just join all lines with newlines, with N*.

Mark Reed · Accepted Answer · 2020-08-23 13:43:31Z

4

Ruby, 76 69 characters

f=->x{[*1..x]+[*1...x].reverse};puts f[9].map{|i|(f[i]*'').center 17}

(Thanks, Patrick!)

Improvements welcome. :)

edited Aug 23 '20 at 13:43

answered Oct 14 '12 at 14:04

Mark Reed

6975 silver badges15 bronze badges

2

\$\begingroup\$ 69 chars: f=->x{[*1..x]+[*1...x].reverse};puts f[9].map{|i|(f[i]*'').center 17} \$\endgroup\$ – Patrick Oscity Nov 5 '12 at 21:11
\$\begingroup\$ Great comment, I didn't know the '...' and didn't understand how this could work. \$\endgroup\$ – G B Nov 25 '16 at 7:10
\$\begingroup\$ 60 chars: [*-8..8].map{|i|puts' '*i.abs+"#{eval [?1*(9-i.abs)]*2*?*}"} \$\endgroup\$ – G B Nov 25 '16 at 8:05
\$\begingroup\$ 54 chars: (-8..8).map{i=_1.abs;puts' '*i+"#{eval(?1*(9-i))**2}"}. It's the same solution optimized. \$\endgroup\$ – Siim Liiser Oct 2 '20 at 12:22

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Ilmari Karonen · Accepted Answer · 2012-10-12 16:22:53Z

3

GolfScript, 36 chars

Assuming that this is meant as a code-golf challenge, here's a basic GolfScript solution:

9,.);\-1%+:a{a{1$+7-.0>\" "if}%\;n}%

answered Oct 12 '12 at 16:22

Ilmari Karonen

19.9k3 gold badges46 silver badges96 bronze badges

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chinese perl goth · Accepted Answer · 2012-10-18 22:05:42Z

3

Perl, 43+1

adding +1 for -E which is required for say

say$"x(9-$_).(1x$_)**2for 1..9,reverse 1..8

edit: shortened a bit

edited Oct 18 '12 at 22:05

answered Oct 17 '12 at 22:48

chinese perl goth

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\$\begingroup\$ Is +1 for -E standard? I mean perl -E is the same number of characters as perl -e. :) \$\endgroup\$ – Mark Reed Aug 23 '20 at 13:58

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cardboard_box · Accepted Answer · 2012-10-19 02:01:11Z

3

Python, 65

for i in map(int,str(int('1'*9)**2)):print' '*(9-i),int('1'*i)**2

answered Oct 19 '12 at 2:01

cardboard_box

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\$\begingroup\$ Try prepending I=int; to your code and replacing all subsequent instances of int with I \$\endgroup\$ – Cyoce Nov 27 '16 at 2:51
1

\$\begingroup\$ @Cyoce I had thought of that. It would save 2 chars each time int is used, and it's used 3 times, so it saves 6 chars at a cost of 6 chars. \$\endgroup\$ – cardboard_box Nov 27 '16 at 4:05

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pawel.boczarski · Accepted Answer · 2015-04-12 15:32:07Z

Bash, 126 109 87 chars

87:

q()(printf %$[9+$1%9]s\\n $[$2*$2];[ 7 -lt $1 ]||(q $[$1+1] ${2}1;q $[$1+9] $2))
q 0 1

As it usually goes, changing from iterative to recursive solution helps us win additional bytes.

Meaning of parameters to q:

$1 How much to remove from 8 to get the number of spaces in the beginning. Note value modulo 9 counts here (actual value is also a hint to quit recursion).

$2 The current chain of 1s to be squared and output by printf.

The modus operandi is:

output the sequence (ie. if $2 is 11111, output 123454321)
(if not yet at 12..9..21 - the recursive step)

2.1. output the next sequence (here: 111111 > $2 , output 12345654321

2.2. output the sequence once again (123454321).

In the step 2.2 , we pass (indent value + 9) instead of indent value however, so that the algoritm "knows" we are printing the row for the second time. Without this, the [ 7 -lt $1 ] would be false, causing us to retrigger the recursive step 1. This would never finish then.

The recursion goes like this:

q 0 1:                          1
 q 1 11:                       121
  q 2 111:                    12321
   q 3 1111:                 1234321
    q  4 11111:             123454321
     q  5 111111:          12345654321
      q  6 1111111:       1234567654321
       q  7 11111111:    123456787654321
        q  8 111111111: 12345678987654321
        q 16 11111111:   123456787654321
       q 15 1111111:      1234567654321
      q 14 111111:         12345654321
     q 13 11111:            123454321
    q 12 1111:               1234321
   q 11 111:                  12321
  q 10 11:                     121
 q  9 1:                        1

109:

p()(printf "%$[8+i]s\n" $[k*k])
k=;for i in `seq 9`;do k+=1;p;done;for i in `seq 8 -1 1`;do k=${k:1};p;done;

"k+=1" is much cheaper as k=$[10*k+1] , and for k being a string of ones it's the same. Same goes for ${k:1} and $[k/10] .

126:

p() (printf "%$[$1+i]s\n" $[k*k];)
k=1;for i in `seq 8`;do p 8;k=$[10*k+1];done;for i in `seq 8 -1 0`;do p 9;k=$[k/10];done;

I guess there may be even shorter solution, but weather is glorious, I can't stand sitting in front of computer any more :).

Leo · Accepted Answer · 2016-11-23 14:41:06Z

3

Befunge-93, 155 chars

9:v:<,+55<v5*88<v-\9:$_68v
> v>     ^>3p2vpv  -1<!  *
, 1^  2p45*3+9<4:    ,:  +
g -^_75g94+4pg7^!    +^ ,<
1 : ^ `0    :-1$_:68*^$
^1_$:55+\-0\>:#$1-#$:_^

Try it online!

It could definitely be golfed more, but it's my first Funge program and my head already hurts. Had a lot of fun, though

answered Nov 23 '16 at 14:41

Leo

9,1621 gold badge18 silver badges54 bronze badges

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Metoniem · Accepted Answer · 2017-02-13 13:00:17Z

JavaScript, 170 bytes

My first code golf :)

Golfed

a="";function b(c){a+=" ".repeat(10-c);for(i=1;i<c;i++)a+=i;for(i=2;i<c;i++)a+=c-i;a+="\n";}for(i=2;i<11;i++)b(i);for(i=9;i>1;i--)b(i);document.write("<pre>"+a+"</pre>");

Ungolfed

var str = "";
function row(line) {
    str += " ".repeat(10 - line);
    for (var i = 1; i < line; i++) {
        str += i;
    }
    for (var i = 2; i < line; i++) {
        str += line - i;
    }
    str += "\n";
}
for (var line = 2; line < 11; line++) {
    row(line);
}
for (var line = 9; line > 1; line--) {
    row(line);
}
document.write("<pre>" + str + "</pre>");

\$\begingroup\$ Welcome to PPCG! \$\endgroup\$ – Евгений Новиков Jul 4 '17 at 10:53 — Евгений Новиков, Jul 4 '17 at 10:53

Community · Accepted Answer · 2020-06-17 09:04:33Z

3

Octave, 38 bytes

x=abs(-8:8);m=x+x';m(m>8)=25;[57-m,'']

To make it work in MATLAB too, you'd need to write x=ndgrid(abs(-8:8));m=x+x';m(m>8)=25;[57-m,''] or x=meshgrid(abs(-8:8));m=x+x';m(m>8)=25;[57-m,'']

edited Jun 17 '20 at 9:04

Community♦

1

answered Feb 28 '17 at 22:49

flawr

41.3k7 gold badges92 silver badges235 bronze badges

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Business Cat · Accepted Answer · 2017-07-26 15:52:54Z

3

Gaia, 9 bytes

9┅…ṫ¦€|ṫṣ

Explanation

9┅         Push [1 2 3 4 5 6 7 8 9]
  …        Prefixes; push [[1] [1 2] [1 2 3] ... [1 2 3 4 5 6 7 8 9]]
   ṫ¦      Palindromize each row: e.g. [1 2 3 4] -> [1 2 3 4 3 2 1]
     €|    Centre-align the rows, padding with spaces
       ṫ   Palindromize the rows
        ṣ  Join with newlines

answered Jul 26 '17 at 15:52

Business Cat

9,0971 gold badge12 silver badges31 bronze badges

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Erik the Outgolfer · Accepted Answer · 2018-04-05 12:44:20Z

3

05AB1E, 9 bytes

žh¦η€ûû.c

Try it online!

answered Apr 5 '18 at 12:44

Erik the Outgolfer

39.1k4 gold badges33 silver badges117 bronze badges

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Print this diamond

107 Answers 107

J, 29 26 24 23 22 21 chars

Explanation

APL (33 31)

Clojure, 191 179 bytes

Mathematica 83 49 43 54 51

Python 2, 72 69 67 61

C, 79 chars

Python 2, 60 59

GolfScript, 33 31 30 characters

Javascript, 114

PHP, 92 90 characters

Common Lisp, 113 characters

Charcoal (non-competing), 13 bytes

How?

JavaScript, 81

Vim, 62 39 38 keystrokes

Explanation:

PowerShell (2 options): 92 84 45 bytes

APL (Dyalog Classic), 20 19 bytes

R, 71 characters

k (64 50 chars)

CJam, 31 27 bytes

Ruby, 76 69 characters

GolfScript, 36 chars

Perl, 43+1

Python, 65

Bash, 126 109 87 chars

Befunge-93, 155 chars

JavaScript, 170 bytes

Golfed

Ungolfed

Octave, 38 bytes

Gaia, 9 bytes

Explanation

05AB1E, 9 bytes

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