How can I get a right solution?

2023 6 23
1 个回答
更新时间：2023 6 23
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Ran in:

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Ran in:
From the euqation expression,b is equal to c and both are equal to zero.However,the simulation result is inverse! I guess that is due to the numerical precision of "double".
What should I do to get right solution？
Thanks!
a = exp(-1i*2*pi/491520*8*10000)
a = 0.5211 - 0.8535i
b = 0.4*a-(a-0.6*a)
ans = -2.7756e-17
c = 0.5*a-(a-0.5*a)
ans = 0

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回答（1 个）

Image Analyst
Image Analyst 2023-6-23

0 个投票

If 10^-17 is not close enough for zero, what precision do you need?
See the FAQ:
https://matlab.fandom.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_(or_similar)_not_equal_to_zero?
Maybe you should try the Symbolic Toolbox.

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