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numcmp.m

version 1.0.0.0 (3.71 KB) by Carlos Adrian Vargas Aguilera
Compares between numerical arrays up to a certain precision.

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Updated 04 May 2016

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Editor's Note: This file was selected as MATLAB Central Pick of the Week

This program compares numerical arrays up to a certain precision.
Examples:
>> numcmp(x); % compares x==0.1
>> numcmp(x,'<=',y,3); % compares x<=y up to 0.001

See the screenshot for another example.

This is usefull to compare serial dates up to 0.1 seconds by using:
>> numcmp(time1*86400,FUN,time2*86400)
and avoiding floating point problems with the serial dates in days.

Cite As

Carlos Adrian Vargas Aguilera (2020). numcmp.m (https://www.mathworks.com/matlabcentral/fileexchange/21190-numcmp-m), MATLAB Central File Exchange. Retrieved .

Comments and Ratings (4)

Rodrigo Pellegrini

Thanks, helped me alot!

Jan Orwat

Bug report - precision is not persistent due to the fact that variables are rounded twice (each one once). Moreover, due to code in lines 103:105 overall precision depends on smallest value in arrays.
e.g.:
>> numcmp([0.076; 0],'==',[0.039; 0],1)'

ans =

0 1

>> numcmp([0.076; 1],'==',[0.039; 1],1)'

ans =

1 1

Jan Orwat

Bug report - second output to the function is not returned.
It is specified as variable DT, but later in code another variable BA is used.

Bug report - infinite values are not handled properly.

>> numcmp([1 1],'==',[1 inf],1)

returns error

jiro

Thanks for the entry. I found a small bug. If I put in a row vector, I get an error on line 103:

>> numcmp(round(rand(1,10)),'==',1)

Error using vertcat
Dimensions of matrices being concatenated are not consistent.
Error in numcmp (line 103)
ABmin = min([A(isfinite(A)); B(isfinite(B))]); % Fixed bug SEP 09, 2008

MATLAB Release Compatibility
Created with R2007b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Acknowledgements

Inspired: Floating point relational operator.

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