Atan function

[laurent berger]

Thanks you for yours answer
So atan(0,-0) is 3.1415927 
If I write 
x=-0
atan(0,x) is still 3.1415927 

atan(x,x) is -3.1415927 

Only for fun , I wonder how can I program this fucntion using scilab ?
How can I guess that variable x is -0 and not 0?

Regards



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