MATLAB: Error using detrend. Too many output arguments

detrendtoo many output arguments

I would like to run this function.

[dataL_d,Tr] = detrend(dataL,1);

However, the following error always occurs:

Error using detrend. Too many output arguments.

I need the Tr information. If I do not want to output Tr, it works. See command below.

[dataL_d] = detrend(dataL,1);

I would be very happy about an answer.

Best regards,

Christoph

Best Answer

You are asking detrend to remove a linear trend.

To get the slope and intercept of your data, use the polyfit function. There is no specified independent variable value, so use the index vector for that:

P = polyfit((1:numel(dataL)), dataL, 1)

The slope is ‘P(1)’ and the intercept is ‘P(2)’.

Related Solutions

MATLAB: Detrend specified inputs/outputs

I worked out a way to do this. I'll post it case anyone has similar issues in the future.

For a time-domain data that is defined as:

data = iddata(Y,U,Ts);

Where Y and U are multiple inputs and outputs respectively. Specific inputs and outputs can be called using:

data_c(:,{'y1','y2','y4','y5','y6'},{'u1','u2','u3'})

We can then detrend the stated outputs only.

data_r = detrend(data_c(:,{'y1','y2','y4','y5','y6'},{'u1','u2','u3'}));

However, we must re-build the iddata.

Yf = [data_r.y(:,1) data_r.y(:,2) data.y(:,3) data_r.y(:,3) data_r.y(:,4) data_r.y(:,5)];
Uf = [data_r.u(:,1) data_r.u(:,2) data_r.u(:,3) data.u(:,4)];
data_f = iddata(Yf,Uf,Ts);

Note that the detrend data has changed the order of the inputs and outputs, with the numerical values following the order they were entered. You must adjust accordingly.

MATLAB: How to detrend the signal

y=detrend(signal_name);

More detail here

Best Answer

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MATLAB: Detrend specified inputs/outputs

MATLAB: How to detrend the signal

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