[pstricks] Draw a vector field

[David Tarazona]

Hi again and thanks for the support

My question is simple, how i can to draw a vector field of the gradient of a
z=f(x,y) function???

i mean, the gradient of z is:

∇Z=(∂z/∂x) î + (∂z/∂y) ĵ

so i want to graph the vector field as seen on pages 9 and 23 on this PDF:
http://www.math.msu.edu/~hensh/latex/pstricks/seminarSS08.pdf<http://www.math.msu.edu/%7Ehensh/latex/pstricks/seminarSS08.pdf>

i think that i could use simply a "double multido" for x and y and graph the
vectors, but i dont know how to get the color effect shown in the PDF...

thanks for the support again

-- 
Att,

David Tarazona
Desarrollos Inteligentes - Mechcorp Ltda.
Tel: (57)(1) 700-6364
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