compiled program error

[Adam D. Ruppe via Digitalmars-d]

On Sunday, 7 June 2015 at 18:59:00 UTC, John Nixon wrote:
> double[] pvi,int_1,int_2;
>
>   int_1=pvi_calc(centre);
>   int_2=pvi_calc(n-1-centre);//pvi_calc is changing int_1!

> double[] pvi_calc(const int n1){
>   return pvi;}


These are the relevant lines: pvi_calc writes to a global array 
(pvi) then returns it.

So the first two lines are just setting int_1 and int_2 both to 
pvi, the same thing. So since they all reference the same array, 
writing to any of them changes all of them.

You'll probably want to move double[] pvi to inside pvi_calc so 
it becomes a new copy, or at least `return pvi.dup;` instead of 
just `return pvi;`