New answers tagged matrix
1
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Find the box by its corners
Jelly, 20 bytes
ẆZẆ$€ẎØ.p¤œịœ|ƑɗƇṪFS
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Dyadic link taking \$M\$ on the left and \$L\$ on the right.
...
- 16.8k
2
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Find the box by its corners
Brachylog, 20 bytes
⟨{szs}{⟨hzt⟩ⁱ²cp}⟩c+
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Takes a list [M, L] through the input variable and yields the box sum ...
- 16.8k
0
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1
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0
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2
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Find the box by its corners
Charcoal, 60 bytes
ＦＬθＦιＦＬ⌊θＦλ«≔⟦⟧ζＦ⟦ικ⟧Ｆ⟦λμ⟧⊞槧θνξ¿⬤⁺ζη⁼№ζν№ηνＩΣＥ✂θκ⊕ι¹Σ✂νμ⊕λ
Try it online! Link is to verbose version of code. Explanation:
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- 150k
1
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Construct the Identity Matrix
Pip -P, 6 bytes
_=BMCa
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Just for completeness sake, here's the shortest non-builtin answer that I could find in ...
- 10k
2
votes
Find the box by its corners
J, 75 72 71 70 68 66 bytes
+/@,@;@((-:&(/:~)"1(;/-#:i.4)&{&>)#])&,[:g@|:&>g=.[:;@,<@(1}.<\)\.
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This takes all ...
- 30.1k
3
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4
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5
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Find the box by its corners
MATL, 53 52 bytes
xZyXH:2XN!"@XJxHP:2XN!"&GJ@3$)leSwS=?2GJ@,wX{:]3$)ss
Try it online! Or verfy all test cases.
- 101k
1
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Make the cheapest cut
sclin, 50 bytes
"tpose"Q ,"."mapf"\& fold~"Q =
2%`",_ - abs +/"map
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For testing purposes:
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- 9,330
2
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Make the cheapest cut
PARI/GP 114 bytes
C(v,w)=vecsum(abs(v-w));c(M)=vecmin(concat(vector(#M-1,i,C(M[,i+1],M[,i])),vector(#M~-1,i,C(M[i+1,],M[i,]))),&L);L
Input: Matrix M, output: ...
- 511
2
votes
Make the cheapest cut
05AB1E, 8 bytes
ø‚€üαOWQ
Outputs a pair of \$[horizontalCuts,verticalCuts]\$, where the truthy cut (1) is the minimum result (e....
- 111k
3
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Make the cheapest cut
APL (Dyalog APL), 18 bytes
⊃∘⍋,⍥(+⌿∘|2-/⊢)∘⍉⍨
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I/O
Input is a numerical matrix
Output is the index of the cut with the same (1-based) indexing ...
- 4,530
0
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1
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Make the cheapest cut
Charcoal, 36 bytes
Ｆ⟦θＥ⌊θＥθ§λκ⟧Ｆ⊖Ｌ⌊ι⊞υΣＥι↔⁻§λκ§λ⊕κＩ⌕υ⌊υ
Try it online! Link is to verbose version of code. Outputs a 0-indexed integer corresponding to the letters ...
- 150k
3
votes
Make the cheapest cut
MATL, 13 bytes
!G,wd|!s]h&X<
The output indicates the cut as the letters in the challenge text, with 1, ...
- 101k
1
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Construct the Identity Matrix
BQN, 4 bytes
=⌜˜↕
Anonymous tacit function; returns a 2D array. Try it at BQN online!
Explanation
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- 34.7k
3
votes
Make the cheapest cut
Jelly, 9 bytes
,ZạƝ€§NŒM
A monadic Link that accepts a list of lists and yields a list of all possible minimal cuts, each of which is a pair of numbers, the (1-...
- 96.2k
3
votes
Make the cheapest cut
J, 23 bytes
(=<./)@,&(1#.2|@-/\])|:
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output
Output is a boolean list of "all possible horizontal cuts" followed by "all ...
- 30.1k
4
votes
Make the cheapest cut
MATLAB / Octave, 63 46 bytes
-17 bytes thanks to @Luis Mendo
g=@(B)sum(abs(diff(B))')
@(A)min([g(A') g(A)])
Returns an anonymous function, used like
...
- 3,553
4
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1
vote
Calculate the inverse of a matrix
q, 3 bytes
inv
k, 1 byte
!
Does exactly as requested. Input must be a float matrix
- 151
3
votes
Calculate the inverse of a matrix
PARI/GP 8 bytes
f(A)=1/A
Built-in function; particularly efficient for matrices with integer matrix elements.
- 511
0
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Antisymmetry of a Matrix
k, 7 bytes
Similar to the APL solution. Compare (x~) original matrix against negated transpose (-+x}
{x~-+x}
- 151
0
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Antisymmetry of a Matrix
J-uby, 28 bytes
Port of Razetime's Ruby answer.
:=~&(:transpose|:*&(:*&:-@))
Attempt This Online!
Explanation
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- 8,816
0
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Zigzagify a Matrix
05AB1E, 11 bytes
ΣN²‰ÐOŠO<è‚
Inputs as flattened_list, width, height (even though I ignore the ...
- 111k
1
vote
Reconstruct a zigzagified matrix
K (ngn/k), 36 bytes
{y#x@<,/((#c)#(|:;::))@'c:.=+/!y:|y}
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Basically the same as Zagify a matrix but with a grade.
- 481
3
votes
Zigzagify a Matrix
K (ngn/k), 50 41 bytes
-9 Can use odometer directly
{(,/x)@,/((#c)#(|:;::))@'c:.=+/!#'(x;*x)}
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- 481
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