Correlation/p values of all combinations of all rows of two matrices

Question

I would like to calculate the correlation and the p value of that correlatio of each species (bac) to each of the factors (fac) in a second data frame. Both were measured at

Answer 1

If you restructure your data, such that you compute correlation between paired columns, it would be super easy.

tbac <- data.frame(t(bac))
tfac <- data.frame(t(fac))

f <- function (x, y) cor(x, y)

tab <- outer(tfac, tbac, Vectorize(f))

as.data.frame.table(tab)

I had an answer using the same idea: Match data and count number of same value.