Trying to input a number of files from a matrix

Question

Saar Peles 2020-9-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/595009-trying-to-input-a-number-of-files-from-a-matrix

编辑： Walter Roberson 2020-9-17

I'm not sure why this isn't working but I'm just trying to load multiple files from a folder and it's not reading my variables in the matrix as a string. I tried converting to chars but I obviously need more than 1 char based on the example below.

subName = ["10", "12"];
InputFolder = 'F:\Graph Data\';
for i = 1:(size(subName)) %through the size of the number of input files
    load([InputFolder,'S',(subName(i)),'_data']);
end

I'd appreciate any help

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Answer 1

Walter Roberson 2020-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/595009-trying-to-input-a-number-of-files-from-a-matrix#answer_495808

>> subName = ["10", "12"]; size(subName), 1:size(subName)
ans =
     1     2
ans =
     1

size() with a single parameter always returns a vector with at least two elements. When you give the colon operator a non-scalar value (such as a vector of length 2), then it ignores everything except the first value... which in this case is 1, the number of rows in subName.

load([InputFolder,'S',(subName(i)),'_data']);

You should probably be using something like

load( fullfile(InputFolder, "S" + subName(i) + "_data.mat") )

and better yet would be to assign the result of load() to a variable, instead of "poofing" variables into existence.