src/test/scripts/functions/mlcontext/eval-test.dml

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# product between matrix and scalar
f1 = function (matrix[double] M, double factor) return (double res) {
  res = prod(M) * factor
}

# replace the matrix with a scalar and then use calculate the product
f2 = function (matrix[double] M, double r) return (double res) {
  R = replace(target=M, pattern=1, replacement=r)
  res = f1(R, 10)
}

# production of two matrix
f3 = function (matrix[double] M1, matrix[double] M2) return (matrix[double] res) {
  res = M1 %*% M2
}

f4 = function (matrix[double] M1, matrix[double] M2) return (matrix[double] res) {
  res = M1 %*% M2
}

# some variables
X = matrix("1 2 3 4", rows=2, cols=2)
y = 10

R1 = eval("f1", X, y)
R2 = eval("f2", X, y)
R3 = eval("f3", X, X)
for(i in 3:4)
  R4 = eval("f"+i, X, X);

print(toString(R1))
print(toString(R2))
print(toString(R3))
print(toString(R4))