When using this code
WEHAsum = read.csv("/tmp/wehasum.csv", check.names = FALSE, as.is=TRUE)
plotPCA(as.matrix(WEHAsum[,-1][,sort(colnames(WEHAsum[,-1]))]),
x.coord=-20, y.coord=20)
I get
Error in (function (classes, fdef, mtable) :
unable to find an inherited method for function 'plotPCA' for signature
'"matrix"'