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matlabevalsymbolic-mathmaple

evaluate numeric part of a "sym" variable

I need to evaluate numeric part of a "sym" variable in MATLAB(something like "evalf" function in maple) for instance I have this sym variable :

(12*(51*EE*II - 8*39^(1/2)*EE*II))/(AA*ll^4*ro)

"evalf" in maple gives me 12.48019224*EE*II/(AA*ll^4*ro), is there any way to do this in MATLAB?

Solution

  • I think that you're looking for the vpa (variable precision arithmetic) function

    syms EE II AA ll ro
y = (12*(51*EE*II - 8*39^(1/2)*EE*II))/(AA*ll^4*ro)
vpa(y)

    which returns

    ans =

(12.48019215375377223869826038978*EE*II)/(AA*ll^4*ro)