many thanks for answering Matthieu
Actually my problem concerned the old command "matrixmultiply" vs "dot".
I solved it now.
However I have a question regarding Tkinter.
I am doing a small 3D engine using Tkinter, Pmw and, numpy.
I am basically plotting the result from the matrix calculation on
the Tkinter canevas and it appears to be relatively slow depending
on the processor. I did a test on two different PC.
Is there someone here who has experienced such problem ? It looks like the Tkinter canevas needs time to react with my bindings
Vpython for instance is really fast whatever the PC. Should I use Wxpython
instead of Tkinter ?
Best regards
It's "Not A Number". It can occur when you have a division by zero, a difference between two infinite numbers, ...


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