bugGNU Octave - Bugs: bug #38303, package signal : Not able to get...

 
 

bug #38303: package signal : Not able to get the matlab equivalent output from tfestimate function (transfer function estimate)

Submitted by:  sarbjit <sarbjit>
Submitted on:  Mon 11 Feb 2013 03:46:02 AM UTC  
 
Category:  Octave Forge Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  Fixed Assigned to:  None
Originator Name:  sarbjit Open/Closed:  Closed
Release:  3.6.2 Operating System:  Any

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Sun 17 Mar 2013 11:03:07 PM UTC, comment #1:

I fixed the help text for the tfestimate function. The arguments have been compatible with Matlab but the help text was out of date.

https://sourceforge.net/p/octave/code/11744

The next signal package release will contain this fix.

Mike Miller <mtmiller>
Project Administrator
Mon 11 Feb 2013 03:46:02 AM UTC, original submission:

Hi,

I am having a program which is written in Matlab. When I am trying to run that program in Octave, I am not getting the results as seen in Matlab.

Syntax for tfestimate in Matlab is :
[Txy,F]=tfestimate(x,y,window,noverlap,nfft)

Syntax for tfestimate in Ocatve is :
[Pxx,freq]=tfestimate(x,y,Nfft,Fs,window,overlap,range,plot_type,detrend)

As you can see the order of parameters in Octave are different from that of Matlab. But I am not able to get the expected results from Ocatve even with modifying the order in the code in the Octave.

Snippet from the Matlab code :
[txy W]=tfestimate(x,y,10,[],[]);

So as per Matlab documentation (http://www.mathworks.in/help/signal/ref/tfestimate.html), third argument is window function (which is specified as value of 10), fourth and fifth argument are noverlap and nfft.

I am not able to modify the code as per the octave specification. Appreciate if some one would help me to get the expected results.

I am uploading the .mat files for variable vectors (x and y) generated from Matlab. This file can be loaded as :
load -mat-binary x.mat
load -mat-binary y.mat
[txy W]=tfestimate(x,y,10,[],[]); %MATLAB version
plot(W,abs(txy))

If you plot this in Matlab, curve will be varying while in Octave it will be a straight line. (Uploading the outputs as well).

Thanks in advance for help

-Sarbjit

sarbjit <sarbjit>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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Attached Files
file #27441:  data.zip added by sarbjit (49KiB - application/zip)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2013-03-17 mtmiller StatusNone => Fixed
        Open/ClosedOpen => Closed
    2013-02-11 sarbjit Attached File- => Added data.zip, #27441

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