Turn a numeric function into a symbolic one

2012 5 11
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Hi all,
do you know ho to turn a function with numeric input and output into a symbolic function?
Thanks!

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回答（2 个）

Doug Hull
Doug Hull 2012-5-11

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You will have to enter the function manually if you know it.

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Antonio
Antonio 2012-5-11
Ok, so I guess it is not possible since my numerical function depends on other numerical functions to be defined.
Antonio
Antonio 2012-5-11
I should define all the functions as symbolic ones

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Walter Roberson
Walter Roberson 2012-5-11

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In the case where the numeric function only involves mathematical calculations with respect to the parameter you wish to be symbolic, then pass a symbol to the numeric function.
If the numeric function has any part that is conditional on the input value (e.g., an "if" statement) then there is no mechanical way of handling the situation.

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Antonio
Antonio 2012-5-11
how do you pass a symbolic variable to a numerical function?
Antonio
Antonio 2012-5-11
and eventually get a symbolic result?
Walter Roberson
Walter Roberson 2012-5-11
Just call the function passing in a symbolic variable. Operator overloading takes care of the details.
For example,
f = @(x) sin(cos(x)^2-tan(x))
then
syms p
f(p)

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Antonio
Antonio
2012-5-11

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