29
votes
Determinant of an Integer Matrix
Jelly, 15 bytes
LŒ!ðŒcIṠ;ị"Pð€S
Try it online!
How it works
...
- 49.6k
26
votes
Construct the Identity Matrix
MATL, 2 bytes
Xy
A translation of my Octave answer.
Try it online.
A 4 byte version with no built-ins (thanks to Luis Mendo):
...
- 11.2k
20
votes
Construct the Identity Matrix
TI-BASIC, 2 bytes
identity(Ans
Fun fact: The shortest way to get a list {N,N} is ...
- 21.4k
19
votes
Find the inverse of a 3 by 3 matrix
MATL, 54 bytes
th3LZ)t,3:q&XdpswP]w-lw/GtY*tXdsGXdsUw-IXy*2/+GtXds*-*
Try it online!
Just to keep it interesting, doesn't use the inbuilt matrix division or ...
- 6,612
18
votes
Construct the Identity Matrix
Julia, 9 3 bytes
eye
This is just a built-in function that accepts an integer n and returns an ...
- 24.6k
18
votes
Construct the Identity Matrix
APL, 5 bytes
∘.=⍨⍳
This is a monadic function train that accepts an integer on the right and returns the identity matrix.
Try it here
- 24.6k
17
votes
Billiard balls collision
Python 3, 67 66 bytes, 53 bytes
def f(p,v,q,w):p-=q;d=((v-w)/p).real*p;return v-d,w+d
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-1 byte thanks to @ngn
-13 bytes thanks to @Neil
This ...
- 1,751
16
votes
Construct the Identity Matrix
Python 2, 42 bytes
lambda n:zip(*[iter(([1]+[0]*n)*n)]*n)[:n]
An anonymous function, produces output like ...
- 144k
16
votes
14
votes
Construct the Identity Matrix
Octave, 10 4 bytes
@eye
Returns an anonymous function that takes a number n and returns the identity matrix.
- 11.2k
14
votes
14
votes
14
votes
14
votes
Find the inverse of a 3 by 3 matrix
APL(Dyalog Classic),1 byte
⌹
Try it online!
if a flat lis is required this is 8 bytes
,∘⌹3 3∘⍴
Try it online!
- 791
14
votes
Are these the basis vectors?
Octave, 43 41 39 bytes
@(B,v)(r=rank(B))-rows(B)|r-rank([B;v])
Anonymous function that inputs the set of vectors as a matrix B with each vector in a row, and v as ...
- 104k
13
votes
Verify Eigenpairs
Mathematica, 10 bytes
#2.#==#3#&
Takes input like {vector, matrix, scalar} and returns a boolean.
- 196k
13
votes
Determinant of an Integer Matrix
Jelly, 16 15 12 10 bytes
Ḣ×Zß-Ƥ$Ṛḅ-
Uses Laplace expansion. Thanks to @miles for golfing off 3 5 bytes!
Try it online!
How it works
...
- 210k
12
votes
Construct the Identity Matrix
R, 4 bytes
diag
When given a matrix, diag returns the diagonal of the matrix. However, when given an integer ...
- 24.6k
12
votes
Vandermonde Determinant
Jelly, 5 bytes
œc2IP
œc2 gets all combinations without replacement of length 2. I computes ...
- 68.1k
12
votes
Determinant of an Integer Matrix
R, 3 bytes
Trivial Solution
det
Try it online!
R, 94 92 89 bytes
re-implemented solution
outgolfed by Jarko Dubbeldam
...
- 28.1k
11
votes
11
votes
11
votes
Accepted
Verify Eigenpairs
Jelly, 5 bytes
æ.⁵⁼×
This is a triadic, full program.
Try it online!
How it works
...
- 210k
11
votes
Determinant of an Integer Matrix
Haskell, 71 bytes
-3 bytes thanks to Lynn. Another one bytes the dust thanks to Craig Roy.
...
- 16.3k
11
votes
Characteristic polynomial
SageMath, 3 bytes
5 bytes saved thanks to @Mego
fcp
Try it online!
Takes a Matrix as input.
...
- 13.1k
11
votes
Billiard balls collision
JavaScript (Node.js), 90 88 bytes
(m,n,o,p,q,r,s,t,u=(q-=m)*q+(r-=n)*r,v=o*q+p*r-s*q-t*r)=>[o-(q*=v/u),p-(v*=r/u),s+q,t+v]
Try it online! Link includes test ...
- 166k
10
votes
Construct the Identity Matrix
J, 4 bytes
=@i.
This is a function that takes an integer and returns the matrix.
- 31.2k
10
votes
Construct the Identity Matrix
Jelly, 4 bytes
R=€R
Doesn't use a built-in. Try it online!
How it works
...
- 210k
10
votes
Find the Cross Product
J, 27 14 bytes
2|.v~-v=.*2&|.
This is a dyadic verb that accepts arrays on the left and right and returns their cross product.
Explanation:
...
- 24.6k
10
votes
Vandermonde Determinant
Mathematica, 30 bytes
1##&@@(#2-#&@@@#~Subsets~{2})&
This is an anonymous function.
Expanded by Mathematica, it is equivalent to ...
- 31.3k
Only top scored, non community-wiki answers of a minimum length are eligible