Hi All, I have been running pca smoothly for some time now. However, the error message below makes progress difficult for me. It will be much appreciated if anybody can hint me on the possible source of this error. Thanks Ogbos The error: Error in pca$rotation %*% sqrt(data.cor.eigen.matrix) : non-conformable arguments In addition: Warning message: In sqrt(data.cor.eigen.matrix) : NaNs produced [[alternative HTML version deleted]]