partfrac() function returning same expression
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syms s
% Given expression
F = partfrac((s^2+2*s+1)/(s^3-5*s+3),s)
The output is as follows.
F =
(s^2 + 2*s + 1)/(s^3 - 5*s + 3)
I know syms has a big part to do with it but im not sure exactly what.
回答（1 个）
It gives the same expression as the output because the denominator can not be decomposed with the default factor format i.e. 'rational'.
You can specify a 'full' or 'real' factor mode but the output might not be easy to look at -
syms s
F1 = partfrac((s^2+2*s+1)/(s^3-5*s+3),s,'FactorMode','real')
F2 = partfrac((s^2+2*s+1)/(s^3-5*s+3),s,'FactorMode','full')
vpa(F2)
3 个评论
Esteban
2024-1-31
I assume you mean to show the output with 4 significant digits -
syms s
F = partfrac((s^2+2*s+1)/(s^3-5*s+3),s,'FactorMode','full')
vpa(F, 4)
Dyuman Joshi
2024-2-19
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2024-2-19
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