Unable to load multiple mat files

Question

Deepayan Bhadra 2022-2-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1658505-unable-to-load-multiple-mat-files

评论： Stephen23 2022-3-1

Hello, I have a bunch of mat files as shown below. I feel I've done something similar before but now this is driving me slightly crazy...

I'm trying to load the data from the multiple mat files into a structure or any other easily indexable/accessible format.

This is my code

myFolder = 'C:\Users\dbhadra\Desktop\MSD\M150_Actuation_Accuracy\HittechProto3_RawData\output';
theFiles = dir(fullfile(myFolder, '/*M150*.mat'));
S = struct([]);
for i=1:numel(theFiles)
    S{i} = load(theFiles(i).name);
end

I keep getting errors, most common being below

Error using load
Unable to read MAT-file
C:\Users\dbhadra\Desktop\MSD\M150_Actuation_Accuracy\HittechProto3_RawData\output\2018-10-25_10-56-15_TEST_20_M150RawData_part1.mat.
Not a binary MAT-file. Try load -ASCII to read as text.

The funny is this seems to work standalone, except not in a loop. Where am I going wrong? Thanks.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2022-2-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1658505-unable-to-load-multiple-mat-files#answer_904505

在 MATLAB Online 中打开

This does not match:

S = struct([]);
for i=1:numel(theFiles)
    S{i} = ...    

You define S as a struct, but then you create cell elements. Either use S(i) or initialize S by:

S = cell(1, numel(theFiles));

The path is missing in the load command:

S{i} = load(fullfile(myFolder, theFiles(i).name));

But then the current folder must contain a file with the given name in a not matching format. This is at least strange.

Please openthe file manually and check the format. Are they ASCII-files?

5 个评论
显示 3更早的评论隐藏 3更早的评论

Stephen23 2022-2-28

"but this contradicts the initial error that we see. "

No, it does not.

The error message states "Not a binary MAT-file."

Your file is a binary file, but that does not mean that it is a MATLAB MAT-file.

Jan 2022-3-1

@Deepayan Bhadra: As Stephen said: This is not a binary MAT file. Binary MAT files starts with some readable text like "MATLAB 5.0 MAT-file, Platform: PCWIN64, Created on: Mon Feb 28 12:42:18 2022" before the binary stuff starts. Your file does not. So the error message is correct.

Which software has created the files?

请先登录，再进行评论。

Answer 2

Stephen23 2022-2-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1658505-unable-to-load-multiple-mat-files#answer_904650

编辑：Stephen23 2022-2-26

在 MATLAB Online 中打开

theFiles is already a structure, there is no point in creating another one when you can use theFiles already:

myFolder = 'C:\Users\dbhadra\Desktop\MSD\M150_Actuation_Accuracy\HittechProto3_RawData\output';
theFiles = dir(fullfile(myFolder, '*M150*.mat'));
for k = 1:numel(theFiles)
    theFiles(k).data = load(theFiles(i).name);
end
data = [theFiles.data] % optional, assumes all file contain the same variables.