How to use the std function for signal ????

I have to extract Standard deviantion of multi channel EEG and I dont know how to use the std function can anyone help me please Thanks.

Answer 1

[Jan]

It depends on what you want to achieve:

• If you want to get the standard deviation over the time and the "multi channel EEG" is recorded as [nTimeStep x nChannel] matrix:

SignalStd = std(Signal, 0, 1);

• I the standard deviation between the channels is wanted:

SignalStd = std(Signal, 0, 2);

You see: A specific answer requires more specific details in the question.

[afef]

Thank you for your help.Actually I want to use the standard deviation as a feature for my classsifier for the detection of epileptic seizure

[afef]

please I want to ask you how can i use the function MEAN for my signal i dont know how to write the code.

[Jan]

Did you read doc mean already? It is equivalent to the std command, but without the 2nd input:

SignalMean = mean(Signal, 1);
SignalMean = mean(Signal, 2);