How can I recognize symbolic value with actual value 0?

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Hansol Lee
Hansol Lee 2020-5-3
评论： Hansol Lee 2020-5-3
I was making some calculation and got symbolic value of
ans =
3/2 - (73^(1/2)/4 - 7/4)*(73^(1/2)/4 + 7/4)
it was actually 0, but matlab didn't recognize it. I used double(syms), but the result was
ans =
-4.5278e-72
how can I make matlab recognize it as 0?

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采纳的回答

Walter Roberson
Walter Roberson 2020-5-3
simplify() the expression

更多回答（1 个）

Paresh yeole
Paresh yeole 2020-5-3
You need to specify custom tolerance.
if abs(ans) < 1e-10
ans = 0;
end
You can specify your own tolerance instead of 1e-10.

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