Error Reference to a cleared variable

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meechellevdm
meechellevdm 2016-10-5
评论： meechellevdm 2016-10-5
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.
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meechellevdm
meechellevdm 2016-10-5
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
meechellevdm 2016-10-5
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.

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回答（1 个）

Steven Lord
Steven Lord 2016-10-5
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.
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meechellevdm
meechellevdm 2016-10-5
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
meechellevdm 2016-10-5
ps that second t in myfile.mat was a typo and not how put it in the command window.

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