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

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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.

Accepted Answer

Mischa Kim
Mischa Kim on 19 Apr 2015
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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