Integration with variables as constants

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Alex
Alex 2012-1-25
Hi,
I'm trying to integrate the following function with respect to r from 0 to inf:
4 3
4 r z
---------------
3 / 2 r z \
a exp| ----- |
\ a /
My question: How can I get a numerical value (double) while leaving Z and a as just constants in variable form?
For example, something in the form of 0.566 Z/a where Z and a are kept as just variables but the rest is evaluated to a number?
Thanks

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回答（1 个）

Andrew Newell
Andrew Newell 2012-1-25
If your symbolic expression is y, you can use
yInt = int(y,r,0,Inf);
EDIT: However, you may not get a clear answer. I don't have the Symbolic Toolbox, but in Maple I have to specify that a>0 and z>0 before it gives me an algebraic expression.

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