How to open a .mat file in Matlab

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.

[Mischa Kim]

How about using the load command? Does that not work?

 load mymat.mat

[Mischa Kim]

The file needs to be in a folder which is on the MATLAB path, or, in the current folder. You can set both in the MATLAB UI.

[Priya]

Thanks.

[Areej Nayab]

a=load("1.mat") imshow(a) this is the shortest possible way, and 1 is the name of the image. you will type according to your .mat file.

[Joaquin]

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]

@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

Answer 1

[Image Analyst]

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

[Priya]

Thank you.

Answer 2

[smriti garg]

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!!

[Ramesh Paudyal]

great

Answer 3

[abdelilah mbarek]

use :

whos -file fileName.mat

fileName.mat should be in matlab path

[Walter Roberson]

That could tell you which variables are in the file, but does not load the data from the file.