# Does matlab have a function that says "If zero is near?

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Muhendisleksi 2017년 8월 12일
댓글: Walter Roberson 2017년 8월 12일
I need a command that checks that the number is near zero.
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Jan 2017년 8월 12일
편집: Jan 2017년 8월 12일
Note that "near zero" is not well defined. Is 0.00001 near zeros or only 1e-100?

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### 답변 (1개)

Star Strider 2017년 8월 12일
There is not built-in MATLAB function for that.
It is possible to create one easily enough:
nearZero = @(x,tol) abs(x) < tol; % Test If ‘x’ Is Within ‘tol’ OF Zero
tol = 0.5;
x = rand(1,6) .* (-2:3);
Test = [x; nearZero(x,tol)]
Test =
-0.87571 -0.057386 0 0.090743 1.0487 0.082315
0 1 1 1 0 1
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John D'Errico 2017년 8월 12일
+1. Or you can make it an m-file, if this is something you wish to keep around forever because you use it often. To be honest, I think most of us don't bother, just writing the test like (abs(x)<tol) in our sleep as we need it. That is why there is no function to do this explicitly in MATLAB.
Walter Roberson 2017년 8월 12일
ismembertol can also be used for this purpose

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