I tried to calculate the pairwise pearson correlation of the column
vector of a matrix of 20,000 columns using the gpuCor fucntion from the
package gputools, and compare the speed with the ordinary cor function.

The gpuCor is supposed to be much faster than cor. But I found that the
ordinay cor is faster than gpuCor.

Anybody has any experience with the gpuCor function? And is it fater han
cor fucntion?

Thanks very much.

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