Save and Load a matrix

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Kamuran 2015-12-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/261044-save-and-load-a-matrix

评论： Stephen23 2021-11-7

Hello, I know this a general question but I am having trouble with saving a matrix and loading it into another code. I do;

save('vzpre1','vz');   % The variable is vz and I save as vzpre1. I just want to save only vz matrix nothing else
vz=load('vzpre1');     % I want to load vzpre1 as vz.

But once I load it. It loads as struc not a matrix.

Any idea?

Thanks

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Nicle Davidson 2021-9-25

编辑：Nicle Davidson 2021-9-25

在 MATLAB Online 中打开

Try this:

save('vzpre1','vz'); 
load('vzpre1','vz'); 
%also use vzpre1.mat instead of just vzpre1, so this code instead:
save('vzpre1.mat','vz'); 
load('vzpre1.mat','vz'); 
%so you use a .mat file for this transaction

Stephen23 2021-11-7

Do NOT just LOAD directly into the workspace. That approach is fine when experimenting at the command window, but not for code that you write in scripts or functions (i.e. when you want reliable, repeatable code).

It is much more robust to LOAD into that structure and then access its fields. That is what experienced MATLAB users do.

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Answer 1

DGM 2021-11-7

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I don't know why nobody has thrown an answer here, but here goes.

The output argument of load() is a struct. You either use the struct contents as they are, or you can assign them to new variables if it makes using them easier.

vz = rand(100); % a matrix
save('vzpre1','vz'); % write the variable to vzpre1.mat
S = load('vzpre1'); % read mat file into a struct
vzfromthefile = S.vz; % explicitly define the incoming variables
immse(vz, vzfromthefile) %show that the two arrays are identical
ans = 0