src/test/scripts/component/resource/mm_test.dml

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fileX = $X;
fileY = $Y;
# R - virtual result
fileR = "R.csv";
fmtR  = "csv";

X = read(fileX);
Y = read(fileY);

R = X%*%Y;

# trigger full calculation
write(R, fileR, fmtR);