Error Reference to a cleared variable

Hi I am trying to load a .mat file that has a matrix array of 2500 rows x 75 columns, and then create a new file name x that has values from all rows and columns 1 to 66. This is my code:

load myfile.mat

x = myfile(:,:);

x=x(:,1:66);

I then get an Error that says Reference to cleared variable myfile. I used this same code with a .txt file and it worked, but have been stuck trying to figure out for hours why it wouldnt work for a .mat file. Any advice would be huge help for me.

[Matthew Eicholtz]

Is the matrix array in myfile.mat called myfile? Also, no need for the colons.

Use

x = myfile;

instead of

x = myfile(:,:);

[meechellevdm]

Yeah, the mat file is called (i.e.saved as) myfile. Removing colons and brackets after x = myfile(:,:); gives me a different error: Undefined function or variable 'myfile'.

I get the same error if I add .mat to the command x=myfile.mat;

[meechellevdm]

Hey I figured it out! Turns out the matrix inside the myfile was called something else which I had to specify during these commands

load ('myfile.mat', 'othernamematrix')

x = othernamematrix;

Yay, thanks Matthew you put me on the right track.

Answer 1

[Steven Lord]

If this is in a function and you use clear all or clear myfile inside that function, remove the clear all and/or clear myfile calls.

If it's inside a function but you don't call clear all please post a simplified version of that function with which you can reproduce the error.

[meechellevdm]

There was a clearall command inside the function (but before the commands: load myfile.matt

x = myfile(:,:);

x=x(:,1:66);

Nevetheless, even removing the clear all command doesnt make the error go away. I literally typed load myfile in the command window, and then x = myfile(:,:); after which I get the Error. I attach the myfile.mat.

[meechellevdm]

ps that second t in myfile.mat was a typo and not how put it in the command window.