how can I convert a string to an expression which "symvar" can search for identifiers?

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sadel
sadel 2011-6-7
how can I convert a string to an expression which "symvar" can search for identifiers?
I use this: symvar 'cos(pi*x - beta1)'
ans =
'beta1'
'x'
and it works, but when I use this:
insertfunction='cos(pi*x - beta1)'
symvar insertfunction
it doesn't have the same results. How can I make it?

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采纳的回答

Paulo Silva
Paulo Silva 2011-6-7
insertfunction='cos(pi*x - beta1)'
symvar(insertfunction)

更多回答（1 个）

Ivan van der Kroon
insertfunction='cos(pi*x - beta1)'
>> symvar(insertfunction)
ans =
'beta1'
'x'

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