Error indexing usig logicals
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Hi there, I have an issue while using logicals for change the size of a vector: here's a simple code test:
rad = 0.3;
A = linspace(0,1,51);
nn = A(A <= 3*rad);
n2 = A(A <= 0.9);
Normally size(nn) has to be equal to size(n2), but nope... I'm kind of lost. Does anyone have an idea what's going on here?
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"Error indexing usig logicals"
There is no error.
" Does anyone have an idea what's going on here?"
Yes. It is very simple: you need to learn about the practical limits of floating point numbers:
And some external links on this topic:
回答（1 个）
Fangjun Jiang
2018-5-17
0 个投票
This is really a floating point data precision issue. Run this to find out and deal with it based on whatever your use case.
isequal(3*0.3, 0.9)
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