Solved
eliminate some values
how can I fix this:
if (a )is less than zero the answer should alwyas be zero
You don't need a range variable w !
What your program tried to achieve can be done that way:
The assignment in the first line is mandatory, otherwise you would have to use an else-statement to assign the (positive) value of a[w to the Result vector.
The same effect could be achieved using a boolean expression (a>0) and vectorization:
Prime 10 worksheet attached