mcount (mex)

Version 2.1.2.0 (3.23 KB) by Stefano Gianoli
Counts the number elements in a specified vector or matrix that match a specified criteria.
3.0
(1)
1.5K Downloads
Updated 21 Jun 2016

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Given a vector or matix MATRIX, counts the number of times that the scalar X satisfy the (string) condition COND. The result is returned in the variable RES. the COND operators allowed are: ==, >=, <=, <, >, !=. The function is faster than SUM(MATRIX'COND'X) or LENGTH(FIND(MATRIX'COND'X)). A test script is provided to show the performances.

Cite As

Stefano Gianoli (2024). mcount (mex) (https://www.mathworks.com/matlabcentral/fileexchange/5194-mcount-mex), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2016a
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes
2.1.2.0

small bug fix
2.1.1.0

Name changed to mcount as another function named count exist in MTREE/count.
2.1.0.0

added a test script
2.0.0.0

Can handle NaNs.
To compile it from Matlab Command Window:
>mex count.c
test with:
> count([1 2 2 3 NaN NaN Inf; 1 2 3 4 5 6 7],NaN,'!=')
ans =
12
1.0.0.0