batchFunc only multiplies first column in a sparse matrix #1988

When using batchFunc to perform element-wise multiplication, only the first column is actually multiplied when using a sparse matrix.

For example, if G is a square sparse matrix and nw is a dense column vector, the following code only applies the multiplication on the first column of G:

array batch_mult(const array &lhs, const array &rhs) {
	return lhs * rhs;
}

array Cw = batchFunc(G, nw, batch_mult); 

If G is dense, then everything works fine.

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