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resampling signals in matlab 2012b

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m 2013-8-16

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采纳的回答： m

hello i want to downsampling a signal with 173HZ and 23.6s to 120HZ ,can i do it with matlab 2012b ?

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m 2013-8-16

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yes, i have signalprocessing toolbox,but i cant use '_resample()_' can you tell me about parameters (173 hz to 120 hz)? thanks.

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编辑：Jan 2013-8-16

在 MATLAB Online 中打开

Matlab help says:

y = resample(x,p,q) resamples the sequence in vector x at p/q times the original sampling rate, using a polyphase filter implementation. p and q must be positive integers. The length of y is equal to ceil(length(x)*p/q). If x is a matrix, resample works down the columns of x.

i.e. in your case p=120 and q=173, so:

x_resampled = resample( x, 120, 172 )

should do the trick.

m 2013-8-16

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thanks for your answer,i run it but get this error: "_Too many input arguments._" do you know this error? my x variable is eq 4096

Jan 2013-8-16

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Check the type of your signal. It should be either a vector or a 2-d matrix.

m 2013-8-16

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编辑：m 2013-8-16

can i attach the file of sampled signal to this comment, that you can see it?

Jan 2013-8-16

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Before you start uploading files: how do you load the signal into the Matlab environment and what kind of signal is it that you are dealing with?

m 2013-8-16

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i want to import the eeg signal ,the file has 4097 numbers,i use import from menu then import it to a variable,and the file has one column... i think matlab has a bug with this function because when i try to run sample code of 'resample' i see this error again !

Jan 2013-8-16

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In the Matlab command line type whos and post the output.

Also type the variable name and post that output, too.

m 2013-8-16

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在 MATLAB Online 中打开

my input command : y=resample(inputsig,120,173); output : Error using resample Too many input arguments.

my enviroment report : Name Size Bytes Class Attributes

inputsig      4097x1               32776  double              
y                1x4098            32784  double

Jan 2013-8-16

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在 MATLAB Online 中打开

Could you type

which resample

and post that output?

Walter Roberson 2013-8-16

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在 MATLAB Online 中打开

Please post the result of

which -all resample

m 2013-8-16

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ofcourse, the output is :E:\edu\ARSHAD AI\classes\EVALUATIONARY ALGORITHMS\Project\Steps\Data\resample.m

do you think the path is so long?

Jan 2013-8-16

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No, there is a function in your project that is called resample too which hides Matlab's resample function. Unload the path you just posted from your environment and try to call resample again.

m 2013-8-16

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编辑：m 2013-8-16

E:\edu\ARSHAD AI\classes\EVALUATIONARY ALGORITHMS\Project\Steps\Data\resample.m C:\Program Files\MATLAB\R2012b\toolbox\matlab\timeseries\@timeseries\resample.m C:\Program Files\MATLAB\R2012b\toolbox\ident\ident\@iddata\resample.m C:\Program Files\MATLAB\R2012b\toolbox\simbio\simbio\@SimData\resample.m C:\Program Files\MATLAB\R2012b\toolbox\matlab\timeseries\@tscollection\resample.m C:\Program Files\MATLAB\R2012b\toolbox\signal\signal\resample.m

m 2013-8-16