src/test/scripts/functions/recompile/rewrite_mapmultchain2.dml

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X = read($1);
P = read($2);
v = read($3);
k = ncol(P);

while(FALSE){}

Q = P[, 1:k] * (X %*% v);
HV = t(X) %*% (Q - P[, 1:k] * (rowSums (Q) %*% matrix(1, rows=1, cols=k)));
        
while(FALSE){}

write(HV, $4);