MATLAB: How does ‘subs’ in MATLAB work with negative large fractional number

subssubstitutionsymbolicsyms

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.

Best Answer

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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