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diff and use value

diff and use value

diff and use value

(OP)
Hello,

I doubt if I can use the result from the command 'diff' to calculate in the next step.

Say, I have a function F(x,y,a,b,h). I first 'sym' them and let F be the function. I then let f = diff(F,x), for example. I just then let a,b,x,y,h have some values. Unfortunately I cannot use 'f' to calculate for the result since it is a string varible containing result from diff.

Is there any way to use the result from diff as another function that I can plug in numbers?

Thank you for you kind help.

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