Detrending data changing matrix size

Hi there,

The following line of code is kicking back the error "Unable to perform assignment because the size of the left side is 128-by-27 and the size of the right side is 1-by-27"

DFRT.data(1:128,:) = 'detrend(DFRT.data(1:128,:))';

My understanding was that the detrend function would center the data and remove the linear trend, but would not change data structure or the number of values. Any insight here would be much appreciated!

Answer 1

[Voss]

Do you mean this?

DFRT.data(1:128,:) = detrend(DFRT.data(1:128,:));

[Katherine Benson]

If I change the code to that I get a different error: Index in position 1 exceeds array bounds. Index must not exceed 1.

[Voss]

That could be because DFRT.data has only one row, but you are asking for rows 1 through 128.

Or it could be that you have a variable called detrend, which is preventing MATLAB from running the detrend function and instead MATLAB is interpreting the command as indexing into the variable detrend.

Check for a variable in your code called detrend and rename it to something else, and if your code is a script, then run the following on the command-line and then run your script again:

clear detrend