[OS X TeX] xy-pic question

[Daniel Becker]

hallo,

a few days ago, this list told me to use xy-pic for diagrams. I am now 
learning to use it and start getting what I want and also to like it.

Question:
Is it possible to draw curves of a specific functional form, e.g. y=k^b 
A^{1-a} (A Cobb-Douglas production function in intensive form....).
Or is it alternatively possible to force a curve passing positions / 
coordinates I specify? (Control points are always outside the curve.)

Thanks for any answer.

daniel


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