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3.1 | 15 ratings Rate this file 24 Downloads (last 30 days) File Size: 1.35 KB File ID: #8578
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PDFPLOT

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28 Sep 2005 (Updated )

PDFPLOT displays a histogram of the empirical probability density function (PDF) of the input data.

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Description

PDFPLOT displays a histogram of the empirical probability density function (PDF) for the data in the input array X using nbins number of bins.
If input X is a matrix, then pdfplot(X) parses it to the vector and displays PDF of all values.
For complex input X, pdfplot(X) displays PDF of abs(X).

Example:
  y = randn( 1, 1e5 );
  pdfplot( y );
  pdfplot( y, 100 );

Acknowledgements

This file inspired Probability Density Function (Pdf) Estimator (V3.2).

MATLAB release MATLAB 6.5.1 (R13SP1)
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Comments and Ratings (17)
11 May 2012 chao  
24 Jan 2011 mathworks2011

[f,xi] = ksdensity(X, 'npoints', 1000);

10 Jul 2010 Amit L  
06 May 2010 Holger Hiebel

As somebody other already mentioned:
Be careful, to get the real PDF estimate replace
bar(X, N/sum(N));
with
bar(X, N/sum(N)/step);

23 Jun 2008 Paul Beekhuizen

Nothing more than just a standard histogram with cleverly chosen bins. Much better techniques exist to display a pdf. On top of that, it is buggy (although this can be easily fixed by the fix proposed in one of the other reviews).

20 Feb 2008 Jon Hyde  
06 Feb 2008 Sean Winfree

Yes, the fix suggested by Tim Hattrell
returns the correct pdf. Thanks Tim

07 Jan 2008 seema sudevan  
04 Jun 2007 Tim Hattrell

I don't think this calculates the correct PDF as the area under the graph is not one. Replace bar(X, N/sum(N)); with bar(X, N/sum(N)/step); to fix this.

01 May 2007 Eoin Elliffe

It would be nice if you could do Ntigram as for pdf you generally need variable bin sizes.

06 Mar 2007 Hong La

Okey, i seem it to be my need but not. This is not new thing, a little simple.

01 Dec 2006 Jonathan Duplicy

good job - what I need.
unbelievable it's not included in stat. toolbox

03 Aug 2006 Li jia

just what i want, thank you

19 Mar 2006 anonym anonym

check how it works:
plot(-3:0.1:3,pdf('norm',-3:0.1:3,0,1))
hold
pdfplot(x,30)

23 Dec 2005 Norbert Pierre

Allows visualization of the data. An extremely useful utility.

18 Nov 2005 sui lasiko

excellent!

02 Oct 2005 x x

whats the numel function?? its not specified

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