simplifying symbolic expressions with factors of pi

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David H
David H 2014-7-18
评论： David H 2014-7-18
If I have some symbolic expression say
FF = besselj(1/2,x)
FF = (2^(1/2)*sin(x))/(pi^(1/2)*x^(1/2))
I wish to cancel this factor of pi^(1/2) however if I do
GG = FF*pi^(1/2)
then I will get an expression that still has the factor of 1/pi^(1/2) but also a numeric approximation to pi^(1/2) multiplied by it.
How does matlab hold this "symbolic" pi value, since clearly normal pi is just a dp variable and how do I cancel it in expressions?

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-7-18
编辑：Azzi Abdelmalek 2014-7-18
vpa(FF)
or
vpa(FF,4)
  1 个评论
David H
David H 2014-7-18
vpa will convert this expression yes but there must be a way to simply cancel this symbolic pi that matlab introduces itself exactly to produce nicer expressions?

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