Nothing
## Some tests of Alt()
test_that("Function Alt() behaves itself", {
foo <- function(S){ # idempotence of Alt()
discrepancy <- Alt(Alt(S)) - Alt(S)
## discrepancy should be zero in theory, but numerical
## roundoff means discrepancy might not be the zero tensor.
if(!is.zero(discrepancy)){
error <- coeffs(discrepancy)
expect_true(max(abs(error))<1e-8,info=dput(S))
} else {
expect_true(TRUE)
}
} # foo() closes
bar <- function(S,V){ # Alt() is in fact alternating
S <- Alt(S)
if(ncol(V)>=2){
V1 <- V[,c(2,1,seq(from=3,to=ncol(V)))]
expect_true(abs(as.function(S)(V) + as.function(S)(V1)) < 1e-6)
}
}
for(i in 1:10){
terms <- sample(2:4,1)
k <- sample(3:4,1)
n <- sample(2:4,1)
S <- rtensor(terms,k,n,rnorm(terms))
foo(S)
V <- matrix(rnorm(k*n),ncol=k)
bar(S,V)
}
# test that issue #48 has been resolved:
foo(as.ktensor(matrix(c(4,2,4,3,4,2,2,3,3),3,3),1:3))
expect_silent(Alt(spray(rbind(1:3,2:4),1:2),give_kform=TRUE))
})
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