using load function with variables in MATLAB

Question

filterSize sz = sprintf( '%dx%d', filterSize, filterSize );

I have some .mat files named

results_3x3.mat

results_5x5.mat

and so on..

I am importing that files with load function. But since that I have 20 files I need to do it in a for loop. filterSize=3:2:41

I need to use the load function in MATLAB with variables. I am now doing it manually as follows:

F1_score_3 = load('results_3x3.mat');
accuracy_3 = F1_score_3.accuracy;

F1_score_5 = load('results_5x5.mat');
accuracy_5 = F1_score_5.accuracy;

F1_score_7 = load('results_7x7.mat');
accuracy_7 = F1_score_7.accuracy;

F1_score_3 = load('results_&s.mat',sz); doesn't work.

Can you help me with this? Also, can I define variables with another variable in them? Such as

F1_score_%d, filterSize

James Tursa · Accepted Answer · 2022-08-23 22:45:20Z

1

Do not create dynamic variable names that contain numbers like this. They will be hard to work with downstream in your code. It would be better to store the results in an array or cell or struct. E.g., you could do something like this using a cell array:

F1_score = cell(41,1);
for filterSize=3:2:41
    fname = sprintf( 'results_%dx%d.mat', filterSize, filterSize );
    F1_score{filterSize} = load(fname);
end

Then when you want to get at accuracy, you can use indexing as usual. E.g.,

F1_score{3}.accuracy

answered Aug 23, 2022 at 22:45

James Tursa

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19 Comments

Yasemin G. Over a year ago

Thank you but I get an error saying that >Dot indexing is not supported for variables of this type.

James Tursa Over a year ago

I don't have your mat files so I can't know what variables and types you are loading. Once you do the load, examine the F1_score{3} variable to see what was loaded etc.

James Tursa Over a year ago

Isn't F1_score{3} a struct? Doesn't it have a field named accuracy?

James Tursa Over a year ago

What is class(F1_score) and class(F1_score{3})?

James Tursa Over a year ago

So doesn't that mean that class(F1_score{3}) is a struct? What does fieldnames(F1_score{3}) show?

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