How to store a matrix so that I can call upon it in any other file I am working in?

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Scott Banks
Scott Banks 2025-7-24
评论： Scott Banks 2025-7-25
Ran in:
Hi there,
I am trying to save a matrix of data that I want to use, so that I can call upon it whenever I wish. Plus, I don't want it taking up space in my other script I am working on. I have been searching online how to do this apparent simple task, but can't seem to get it right.
So say I'm in a file called Frame2.mat, and the matrix is:
A = rand(10,10)
A = 10×10
0.5228 0.7856 0.3229 0.6056 0.3178 0.8621 0.8351 0.8522 0.6084 0.0708 0.8254 0.4739 0.8760 0.3915 0.5663 0.8099 0.1573 0.9719 0.3930 0.7211 0.9450 0.8130 0.5576 0.2800 0.4407 0.3070 0.9011 0.7068 0.2419 0.1356 0.0966 0.8290 0.4090 0.8699 0.8585 0.7259 0.0443 0.7975 0.6078 0.6212 0.0465 0.6980 0.5365 0.0164 0.0368 0.4520 0.2349 0.6107 0.2868 0.7108 0.1046 0.3271 0.5281 0.3637 0.6896 0.2049 0.8954 0.0560 0.8737 0.0928 0.0100 0.8795 0.2607 0.7931 0.8346 0.3888 0.2983 0.3102 0.1165 0.0741 0.6809 0.5309 0.9333 0.4969 0.9272 0.2590 0.7933 0.3678 0.9152 0.6260 0.6133 0.5114 0.2475 0.7920 0.0814 0.5666 0.4892 0.2776 0.3486 0.4589 0.8599 0.2761 0.4248 0.8110 0.2638 0.9842 0.6746 0.2426 0.4833 0.7074
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Then I go to another file I am working in and want to call upon matrix A and extract the first column.
So in this different file (not Frame2) I want to use:
T = A(:,1)
T = 10×1
0.5228 0.8254 0.9450 0.0966 0.0465 0.1046 0.0100 0.6809 0.6133 0.8599
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How do I do this?
Many thanks
Scott
  1 个评论
Stephen23
Stephen23 2025-7-25
"So say I'm in a file called Frame2.mat, and the matrix is: A = rand(10,10)"
Are you attempting to write a .mat file yourself as a text file? That does not make sense.

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采纳的回答

Torsten
Torsten 2025-7-24
编辑：Torsten 2025-7-24
Declare the matrix as "global" or pass it as input argument to all functions where it is needed.
Or save it as a .mat-file and load it where it is needed.
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显示 6更早的评论
Walter Roberson
Walter Roberson 2025-7-24
Do not save your variable as a .m file, save it as a .mat file.
Or if you really want, save it as a .csv or .txt file that you then readmatrix at need, if you need the file to be editable.
You could also consider
function A = loadA()
persistent A
if isempty(A)
A = load('Matrix.mat', 'A').A;
end
end
after which you would call
A = loadA();
This had the advantage of only reading in A once and remembering the cached value the second and later times.

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