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Ingy döt Net 2023-07-01 11:58:00 -04:00
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commit cb5bb5e222
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Task/Determinant-and-permanent/R/determinant-and-permanent.r Normal file
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library(combinat)
perm <- function(A)
{
stopifnot(is.matrix(A))
n <- nrow(A)
if(n != ncol(A)) stop("Matrix is not square.")
if(n < 1) stop("Matrix has a dimension of size 0.")
sum(sapply(combinat::permn(n), function(sigma) prod(sapply(1:n, function(i) A[i, sigma[i]]))))
}
#We copy our test cases from the Python example.
testData <- list("Test 1" = rbind(c(1, 2), c(3, 4)),
"Test 2" = rbind(c(1, 2, 3, 4), c(4, 5, 6, 7), c(7, 8, 9, 10), c(10, 11, 12, 13)),
"Test 3" = rbind(c(0, 1, 2, 3, 4), c(5, 6, 7, 8, 9), c(10, 11, 12, 13, 14),
c(15, 16, 17, 18, 19), c(20, 21, 22, 23, 24)))
print(sapply(testData, function(x) list(Determinant = det(x), Permanent = perm(x))))