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Re: How to calculate z=f(x,y) with loops [message #3147]

Wed, 09 November 1994 07:48

thompson
Messages: 584
Registered: August 1991

Senior Member

buteau@bali.saclay.cea.fr (A.Buteau 62 17) writes:

> I need to calculate the value of z=f(x,y) .
> Z is a 2D array (fltarr(n,n)).
> X and Y are the X and Y indices of this array.

> I'd like to calculate :

> for y=0,n-1 do begin
> for x=0,n-1 do begin
> z(x,y)=...a function of X and Y (the function can be
> of any kind)
> endfor
> endfor

> But I'would like to do it without (or with only one ) for loops
> for performance consideration.

XX = X # REPLICATE(1,N_ELEMENTS(Y))
YY = REPLICATE(1,N_ELEMENTS(X)) # X
Z = funct(XX,YY)

Bill Thompson

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