# REPOP -- efficient replicating n-d array operations

Version 1.3.1.0 (45.7 KB) by
REPOP -- any element-wise operator between different sized n-d matrices without memory copies
Updated 17 Nov 2021

# repop

auto replicating operators in matlab

Replicating arithmetical and logical operators.

Does element by element operations on X and Y where non-same sized dimensions are implicity wrapped round to match the size of the larger to give a result matrix Z with size max(size(X),size(Y));

In general this is at least 2x faster than the equivalent matlab code using repmats and has the advantage of requiring no additional memory.

Example Usage:

X = randn(10000,10); example signal with data in rows

stdX = repop(X,mean(X,1),'-'); subtract the mean vector

stdX = repop(stdX,std(stdX,0,1),'/'); % divide by std-deviation

Operator can be one of:

Arthemetical -- returns a double matrix

'+','.+',plus - Implicitly repmatted elementwise addition

'-','.-',minus - Implicitly repmatted elementwise addition

'','.',times - Implicitly repmatted elementwise multiplication

'^','.^',power - Implicitly repmatted elementwise raise X to power Y

'','.',ldivide- Implicitly repmatted elementwise divide Y by X

'/','./',rdivide- Implicitly repmatted elementwise divide X by Y

Relational -- returns a logical matrix

N.B. for complex inputs the <,>,<=,>= operators are based upon abs(x) (not real(x) as in matlab)

'==',eq - Implicitly repmatted elementwise equality

'~=',ne - Implicitly repmatted elementwise dis-equality

'<' ,lt - Implicitly repmatted elementwise less than

'>' ,gt - Implicitly repmatted elementwise greater than

'<=',le - Implicitly repmatted elementwise less than equal

'>=',ge - Implicitly repmatted elementwise greater than equal

### Cite As

Jason Farquhar (2024). REPOP -- efficient replicating n-d array operations (https://github.com/jadref/repop/releases/tag/1.3.1.0), GitHub. Retrieved .

##### MATLAB Release Compatibility
Created with R2021b
Compatible with any release
##### Platform Compatibility
Windows macOS Linux
##### Categories
Find more on Logical (Boolean) Operations in Help Center and MATLAB Answers

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
Version Published Release Notes
1.3.1.0

See release notes for this release on GitHub: https://github.com/jadref/repop/releases/tag/1.3.1.0

1.3.0.0

bug fix update

1.2.0.0

Fixed bug with the repop(x,'op',y) calling convention

1.1.0.0

Some minor code updates to make build better with 64bit macs.

1.0.0.0

bug fixes to memory management errors
added mod,min,max to the set of operators

To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.