groupMeans

MEAN(X,DIM,CATEG) - take the MEAN of X along DIM, but grouped according to a categorical variable.
240 Downloads
Updated 11 Feb 2013

View License

mu = groupMeans( X, DIM, CATEG )

MEAN of the matrix X along dimension specified, but grouping the other dimensions according to the categories in 'categ'.

CATEG must threfore have same length as the specified dimension of X.

returns: a matrix with same size as X, except for the specified dimension -- along that dimension, there is one slice per unique level of 'categ'.

% example:
% X = [1 2 3; 4 5 6; 7 8 9; 10 11 12]
% C = [ 1; 1; 2; 2 ]; % each row of X has a category
% groupMeans( X, 1 ,C ); % mean along vertical dimension, but group
% % rows according to C
% ans =
% 2.5 3.5 4.5
% 8.5 9.5 10.5
%
% i.e. the first row is mean( X( C==1, : ) , 1 )
% and the second row is mean( X( C==2, : ) , 1 )
%

note: the function will use NANMEAN if you have it on the path.

Cite As

Sanjay Manohar (2024). groupMeans (https://www.mathworks.com/matlabcentral/fileexchange/40234-groupmeans), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2012b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Tags Add Tags

Community Treasure Hunt

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

Start Hunting!
Version Published Release Notes
1.0.0.0