src/test/scripts/functions/builtin/image_mirror.R

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# to you under the Apache License, Version 2.0 (the
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args = commandArgs(TRUE)
options(digits=22)
library("Matrix")


reverseMatrix = function(M)
{
  out = matrix(0, nrow(M), ncol(M));
  for( i in 1:ncol(M) ) 
  {
    col = as.vector(M[,i])
    col = rev(col);
    out[,i] = col;
  }
  return(out)
}

X = as.matrix(readMM(paste(args[1], "A.mtx", sep="")))

Bx = reverseMatrix(X)
writeMM(as(Bx, "CsparseMatrix"), paste(args[2], "Bx", sep=""));

By = t(reverseMatrix(t(X)))
writeMM(as(By, "CsparseMatrix"), paste(args[2], "By", sep=""));