>Anyway, it doesn't do what you wanted. You should use
>diferrent variables than xx and yy in your external loops
>(e.g. #while (sx < 2) and #while (sy < 2) and add #declare
>xx = sx ; #declare yy = sy ; just before #while (i <
>MaxIter))

Right, and it has been fixed (and now it works) !, but it doesn't explain
the -nan !

> As for the error, do you get it immediately, or does it
>loop some before crashing? (if the second, I'd be interested
>in seeing the values of tt, xx, and yy just before the
>crash...)
No way : it crashes when I want to call #warning  str(tt, 5,0) (1st time)

Thanks for helping
Philippe

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