How to open a .mat file in Matlab

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Priya
Priya 2014-3-27
编辑： Walter Roberson 2024-11-25
Hi,
I'm trying to open a .mat file in Matlab, but am unble to do it. I followed the instructions from this link below,
http://www.mathworks.com/matlabcentral/answers/103000-why-have-all-my-mat-files-become-associated-with-microsoft-access
After step 6, I have a separate folder for 'R2012B', now what should I select from this folder.Please let me know your suggestions.
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Joaquin
Joaquin 2024-11-25
doesn't show anything, it gives me an error
Error using imageDisplayValidateParams
Expected input number 1, I, to be one of these types:
double, single, uint8, uint16, uint32, uint64, int8, int16, int32,
int64, logical
Instead its type was struct.
Error in images.internal.imageDisplayValidateParams (line 11)
validateattributes(common_args.CData, {'numeric','logical'},...
Error in images.internal.imageDisplayParseInputs (line 79)
common_args = images.internal.imageDisplayValidateParams(common_args);
Error in imshow (line 253)
images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});
Error in Base_Lab_estudiantes (line 2)
imshow(a)
Stephen23
Stephen23 2024-11-25
编辑：Stephen23 2024-11-25
@Joaquin: the comment given by Areej Nayab will not work, because LOAD returns a structure (with one field of each variable in the MAT file). However, IMSHOW does not accept a structure as its input. The error message states what inputs types it accepts.
You will need to know the fieldname and refer to that, e.g.:
S = load(..)
imshow(S.YourFieldnameHere)
See:
https://www.mathworks.com/help/matlab/ref/load.html
https://www.mathworks.com/help/matlab/matlab_prog/create-a-structure-array.html

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回答（3 个）

Image Analyst
Image Analyst 2014-3-27
Spcify the full path of your file
folder = 'c:\whatever........'; % You specify this!
fullMatFileName = fullfile(folder, 'wheel_rail_AW.mat')
if ~exist(fullMatFileName, 'file')
message = sprintf('%s does not exist', fullMatFileName);
uiwait(warndlg(message));
else
s = load(fullMatFileName);
end
smriti garg
smriti garg 2015-3-28
编辑：Walter Roberson 2024-11-25
I just got a more user-friendly way of selecting a *.mat file, so thought to share:
[fileName,filePath] = uigetfile('*', 'Select data file', '.');
if filePath==0, error('None selected!');
end
U = load( fullfile(filePath,fileName) );
enjoy!!
abdelilah mbarek
abdelilah mbarek 2018-6-9
use :
whos -file fileName.mat
fileName.mat should be in matlab path
  1 个评论
Walter Roberson
Walter Roberson 2018-6-9
That could tell you which variables are in the file, but does not load the data from the file.

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