Clear Filters
Clear Filters

Unable to load multiple mat files

1 view (last 30 days)
Deepayan Bhadra
Deepayan Bhadra on 25 Feb 2022
Commented: Stephen23 on 1 Mar 2022
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.

Answers (2)

Jan
Jan on 25 Feb 2022
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 Comments
Stephen23
Stephen23 on 28 Feb 2022
"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
Jan on 1 Mar 2022
@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?

Sign in to comment.


Stephen23
Stephen23 on 25 Feb 2022
Edited: Stephen23 on 26 Feb 2022
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.
  2 Comments
Deepayan Bhadra
Deepayan Bhadra on 28 Feb 2022
Hi Stephen, I tried this, even removing the / from the .mat filename. Still the same error
Not a binary MAT-file. Try load -ASCII to read as text.
Stephen23
Stephen23 on 1 Mar 2022
"Still the same error"
Still the same files: not binary MAT files.

Sign in to comment.

Products


Release

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!