MATLAB: Same operation on all matrices from workspace

matricesworkspace

I have a large number of matrices in my workspace and I would like to perform the same operation on all of them. any idea on how to do this?

Best Answer

Let me guess, the matrices on which you want to operate are named A1, A2, A3, ... or have a similar pattern? If so, DON'T DO THAT.

If all the variables have the same size, concatenate them into an N-dimensional array and iterate over the dimension in which you concatenated them. If they don't, store them in a cell array or fields of a struct array and use cellfun, structfun, or arrayfun.

Related Solutions

MATLAB: How to ensure that the output of X2MDATE is the same dimension as the input in the Financial Toolbox R2011a (4.0)

The ability to obain an n-dimensional array output from X2MDATE that is the same size as the input is not available in the Financial Toolbox R2011a (4.0).

As a workaround, obtain an n-dimensional array that is the same dimensions as the input by using the RESHAPE function, as follows:

reshape(x2mdate(dates), size(dates))

Alternatively, use ARRAYFUN, as follows:

arrayfun(@x2mdate, dates)

MATLAB: Adding Arrays of cells

There is a reason we keep on saying not to create numbered or dynamically named variables. It makes using them extremely difficult.

First step: change your algorithm to create just one variable. Options are a cell array of these cell arrays or concatenating the content of the cells in an extra dimension. Once that's done it's almost trivial to calculate the mean:

A = {A1, A2, ...}  %cell array of cell arrays
meanA = cellfun(@(varargin) mean(cat(ndims(varargin{1})+1, varargin{:}), ndims(varargin{1})+1) , A{:}, 'UniformOutput', false)

The complication here is that I don't know the dimensionality of the matrices you want to average. All the cellfun does is concatenate them all in a higher dimension and take the mean in that dimension.

The result of the concatenation without the mean calculation would be the other way to keep your matrices together

A = {A1, A2, ...}  %cell array of cell arrays
A = cellfun(@(varargin) cat(ndims(varargin{1})+1, varargin{:}), A{:}, 'UniformOutput', false)

Best Answer

Related Solutions

MATLAB: How to ensure that the output of X2MDATE is the same dimension as the input in the Financial Toolbox R2011a (4.0)

MATLAB: Adding Arrays of cells

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