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Student Support Forum: 'derivitive f'[x] stopped working' topicStudent Support Forum > General > Archives > "derivitive f'[x] stopped working"

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kt
03/30/12 9:12pm

Hi,

I am trying to get Mathematica to give me the value of f'[x, r], where

f[x_, r_] := 4 r x (1 - x)
r = .5

But when I type, say, f'[.1, .5] I only get f'[.1, .5] back as the output. I do not understand why because it was giving me a number for the output just a few minutes before. How can I fix this?

Thanks!

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Subject (listing for 'derivitive f'[x] stopped working')
Author Date Posted
derivitive f'[x] stopped working kt 03/30/12 9:12pm
Re: derivitive f'[x] stopped working yehuda ben-s... 03/31/12 9:33pm
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