MATLAB Answers

History.xml strange behavior

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Radu Trimbitas
Radu Trimbitas on 1 Jun 2020
Answered: Gaurav Garg on 8 Jun 2020
When MATlab detect an error, after the error message MATLAB display
[1,2,3]*[2,1]'
Error using *
Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix
matches the number of rows in the second matrix. To perform elementwise multiplication, use '.*'.
An error was encountered opening file C:\Users\Radu\AppData\Roaming\MathWorks\MATLAB\R2020a\History.xml
An error was encountered opening file C:\Users\Radu\AppData\Roaming\MathWorks\MATLAB\R2020a\History.xml

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Radu Trimbitas
Radu Trimbitas on 2 Jun 2020
The last two messages appear systematicaly, after any kind of error.

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Answers (1)

Gaurav Garg
Gaurav Garg on 8 Jun 2020
Hey
I wasn't able to reproduce the same issue on my system. I suspect the error would be because of some history files unable to load during MATLAB startup (MATLAb stores all the commands from command history in a file named history.xml), though they don't seem to have any impact on the normal code.
I would recommend you to restart MATLAB, change the number of rows in the second matrix (because matrix multiplication doesn't support your case - columns in first matrix and rows in second matrix should be same) and try the code again.

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