}
/* Copy the input trxframe struct to the output trxframe struct */
frout = fr;
- frout.bV &= bVels;
- frout.bF &= bForce;
+ frout.bV = (frout.bV && bVels);
+ frout.bF = (frout.bF && bForce);
frout.natoms = nout;
if (bNeedPrec && (bSetPrec || !fr.bPrec)) {
frout.bPrec = TRUE;