How does 'subs' in MATLAB work with negative large fractional number?

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Rahul Bhattacharya
Rahul Bhattacharya 2015-4-19
评论： Rahul Bhattacharya 2015-4-19
syms x y A A=x^2*y; subs(A,{x y},{4 2e-8})
ans =
3022314549036573/9444732965739290427392 ----- wrong result!!!
syms x y A A=x^2*y; subs(A,{x y},{4 2e8})
ans =
3200000000 ------ correct result!!
How do I resolve this type of problem? Please help.

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采纳的回答

Mischa Kim
Mischa Kim 2015-4-19
Rahul, the first result is correct as well. MATLAB simply outputted the result as a fraction. Use
double(subs(A,{x y},{4 2e-8}))
ans =
3.200000000000000e-07
which is the same as
3022314549036573/9444732965739290427392
ans =
3.200000000000000e-07

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