MATLAB Answers

check whether a number belongs to an array or not

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biswajita lenka
biswajita lenka 2011년 12월 28일
댓글: Walter Roberson 2018년 3월 30일
hi all, i want to check a number in the array.i have created an array and i want to know that a whether a perticular number belongs to the array or not. is there any inbuild function for "belongs to" in matlab. can anybody help me?

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Walter Roberson
Walter Roberson 2011년 12월 28일
ismember()
Note: if you are not using purely whole numbers, then please read http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
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Walter Roberson
Walter Roberson 2018년 3월 30일
Note: later versions of MATLAB added ismembertol() for dealing with floating point numbers.

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추가 답변(1개)

Jan
Jan 2011년 12월 28일
A = floor(rand(100, 100) * 1000);
contains5 = any(A(:) == 5);
If the array is large and the searched element is found early, Matlab wastes a lot of time by searching the rest of the array. Then this C-Mex is faster: FEX: anyEq.
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James Tursa
James Tursa 2018년 3월 30일
- Download the code from the provided link
- Compile the code at the command line:
mex anyEq.c -largeArrayDims
- Use the function like any other function. For help on syntax,
help anyEq

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