Re: Plot cdf and pdf graph
- From: siti <siti1184@xxxxxxxxx>
- Date: Mon, 20 Jul 2009 00:14:59 -0700 (PDT)
On Jul 20, 11:58 am, siti <siti1...@xxxxxxxxx> wrote:
On Jul 20, 11:15 am, ImageAnalyst <imageanal...@xxxxxxxxxxxxxx> wrote:
On Jul 19, 9:48 pm, siti <siti1...@xxxxxxxxx> wrote:
On Jul 20, 4:26 am, ImageAnalyst <imageanal...@xxxxxxxxxxxxxx> wrote:
On Jul 19, 12:50 pm, siti <siti1...@xxxxxxxxx> wrote:
hi,
i got a problem to plot a graph in pdf and cdf. i have [9X1000X9]
matrix data. how could i plot it in the form of cdf and pdf? i can't
relate and apply what have been explained in help with my problem.. can
somebody help or share idea with me?
thanks
---------------------------------------------------------------
siti:
I haven't heard before the exact phase "in pdf and cdf." Does cdf
mean Cumulative Distribution Function? Or something else, like a
style of plotting?
Does pdf mean "Probability Density Function" or "Portable Document
Format"? I.e., you either want to plot the histogram of your matrix,
or you want to export your graph to a PDF format file.
If you mean the statistical definitions, them you'll find these
functions useful:
plot() to plot line curves
bar() to plot bar charts if you want the pdf or cdf in that form
instead,
hist() or histc() to get the pdf (the normalized histogram) of your
data
cumsum() to get cdf from pdf
subplot if you want to layout 2 or more separate plots on one figure,
hold on, if you want to plot a second curve without blowing away your
first one.
plotyy() if you want to plot two things, each with a different y scale/
range.
Good luck,
ImageAnalyst
hi,
thanks for your idea. for your information, cdf means cumulative
distribution function. i've been asked to convert a triangle graph to
bell shaped graph and abscissa(normal CDF) graph. but, i don't know
how to do that.- Hide quoted text -
- Show quoted text -
--------------------------------------------------------
I don't either. Makes no sense to me. What have you tried so far?
Or can you give an EXACT written description of your problem? Is this
anything like what you've tried?
clc;
close all;
workspace;
upramp = 1:50;
downramp = 50: -1 : 1;
triangleShape = [upramp downramp];
subplot(1,2,1);
bar(triangleShape);
title('PDF that is a triangle');
cdf = cumsum(triangleShape);
subplot(1,2,2);
bar(cdf);
title('CDF of Trianglular PDF');
set(gcf, 'Position', get(0, 'ScreenSize')); % Maximize figure.
sorry for unclear explanation. can i have your email so that i can
show you something on what i've been done.
i just got it. i used normcdf and normpdf.
thanks
.
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- Plot cdf and pdf graph
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- Re: Plot cdf and pdf graph
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