Read multiple .mat files in the file path in sequence

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mehmet irfan gedik
mehmet irfan gedik 2019-8-30
评论： mehmet irfan gedik 2019-8-30
Hi everyone,
There are 10 .mat files in the file path. I need to read the value of one matrix (called 'Scanning') in this file and keep it in another.
For instance ,
0_cm(1).mat , 0_cm(2).mat .... 0_cm(10).mat
I get the error when I write the following matlab code and filename is a string type, so I can't access files with the variable i.
Test = [];
for i=1:10
filename = "D:\matlab\0_cm(i).mat";
myVars = {'Scanning'};
S = load(filename,myVars{:});
Test = S.Scanning(:,64)
end
Thanks for your answer in advance.

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回答（2 个）

dpb
dpb 2019-8-30
for i=1:10
filename = sprintf('D:\matlab\0_cm(%d).mat',i); % build specific file name
myVars = {'Scanning'};
S = load(filename,myVars{:});
Test = S.Scanning(:,64)
end
  3 个评论
显示 1更早的评论
Steven Lord
Steven Lord 2019-8-30
You could also use string with the + operator.
n = 9;
filename = "D:\matlab\0_cm(" + n + ").mat";
You could use this with fullfile if you wanted.
n = 9;
FN = "0_cm(" + n + ").mat";
filename = fullfile('D:\', 'matlab', FN)
mehmet irfan gedik
mehmet irfan gedik 2019-8-30
@dpb, yes an error is emerging as @Stephen Cobeldick mentions.
Warning: Escaped character '\m' is not valid. See 'doc sprintf' for supported special characters.
Thanks @Stephen Cobeldick,

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mehmet irfan gedik
mehmet irfan gedik 2019-8-30
编辑：mehmet irfan gedik 2019-8-30
Thanks @Steven Lord ,
We could actually solve the problem with a fairly simple method.
https://www.mathworks.com/matlabcentral/answers/478269-read-multiple-mat-files-in-the-file-path-in-sequence#comment_740663
Edit : But I wonder why the sprintf function is causing such a problem ???.
  2 个评论
David K.
David K. 2019-8-30
The reason there is a problem is that when compiling sprintf into a string, the function uses the '\' as an escape character as stephen mentioned. What this means is the text interpreter will look at the next charactes expecting not text but some indicator for something else.
For example, if you want a tab in your string you can do '\t', or '\n' for a newline. Since the '\' is being used like that matlab puts in a way to keep it. typeing '\\' results in a single backslash in the string. So the code can be fixed using stephen's "escape the backslash" method as such
filename = sprintf('D:\\matlab\\0_cm(%d).mat',i);

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