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Results tagged with math
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user 31849
The challenge involves mathematics in some central way. Also consider using more specific tags, listed in the tag wiki info.
1
vote
Accepted
Identify the Conic Section
Matlab, 154 bytes
p=input();c=null([p.^2 prod(p,2) p 1+p(:,1)*0]),s={'circle' 'ellipse' 'parabola' 'hyperbola'};s{3+sign(c(3)^2-4*c(1)*c(2))-~max(abs(c(3)),abs(c(1)-c(2)))}
Saved some bytes thanks …
- 1,316
3
votes
Derivative at the Edge
MATL, 21 15 bytes
2/d1)6Mh8Mt0)h+
TryItOnline
Halves the input vector, and takes successive differences, to give d=[i(2)-i(1) i(3)-i(2) ... i(end)-i(end-1)]/2 and then makes two modified vectors, …
- 1,316
2
votes
Where should I put my restaurant?
MATLAB, 42
If it is OK to take input as
I=[5.7 3.2
8.9 8.1]
then this statement
fminunc(@(y)sum(hypot(I(:,1),I(:,2)-y)),0)
returns 5.113014445748538.
Shamelessly stealing Thomas Kwa's meth …
- 1,316
3
votes
Find the number in the Champernowne constant
MATL, 22 bytes
it10+:Yst' '=~)wYsXf1)
Take the input (i), make the vector 1 to input+10 (10+:), converts the vector to a string (Ys), and remove the spaces, which is painful, (t' '=~)). Then, conve …
- 1,316
12
votes
Smallest integers after N divisible by 2, 3, and 4
MATL, 8 bytes
Qt_2:4\+
Uses Denis' Jelly algorithm, I'm surprised it's the same length!
Try it online, or, verify all test cases.
Q % takes implicit input and increments by one
t_ % duplicat …
- 1,316
1
vote
Divisor reduction
MATL, 13 bytes
tX`t:\ztt]Nq&
Try it online
Explanation:
t % Duplicate input
X` ] % while loop, consumes 1 input
t:\z % calculates n-d(n), by counting number no …
- 1,316
4
votes
Two steps forward and one step back
MATL, 7 bytes
Uses the 3*n-4*(n>1) formula. Multiply input by 3 (3*), push input again (G) and decrement it (q). If the result is not zero (?) then subtract 4 from the result (4-).
3*Gq?4-
Try it …
- 1,316
6
votes
Output the Juggler sequence
MATL, 13 12 bytes
`tt2\.5+^ktq
Try it online!
Explanation
` % do...while loop
tt % duplicate top of stack twice, takes implicit input on first iteration
2\ % take a_k mod 2
.5+^ % adds …
- 1,316
1
vote
Solve an algebraic expression
Matlab, 61 bytes
x=[1 0];a=eval([strrep(input(''),'=','-(') ')']);a(2)/diff(a)
Uses the same algorithm as Ton Haspel to solve the equation. Replaces the = by -( and adds a ) at the end to make the …
- 1,316