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check whether a number belongs to an array or not

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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?

Accepted Answer

Walter Roberson
Walter Roberson on 28 Dec 2011
Note: if you are not using purely whole numbers, then please read
Walter Roberson
Walter Roberson on 30 Mar 2018
Note: later versions of MATLAB added ismembertol() for dealing with floating point numbers.

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More Answers (1)

Jan on 28 Dec 2011
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.
ha ha
ha ha on 30 Mar 2018
@Jan. Can you teach me how to run FEX: anyEq. as you mentioned? Thanks
James Tursa
James Tursa on 30 Mar 2018
- 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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