A problem drawing a graph in matlab
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I'm trying to draw a graph of density in matlab and I'm encountering several problems.
First, binValues is a function that does this :
(for example:)
binValues([24767 33119 30397 31150 26729 29446 28574 29085]',4)
ans =
24767 26855 2
26855 28943 1
28943 31031 3
31031 33119 2
here n = 4, number of categories. In the code at the bootom n=3.
This is the code that doesn't work well:
function graph = histogram(z,n)
data = binValues(z,n); %
z=sort(z);
sum=0;
for i=1:n
sum=sum+data(i,3);
end
density = zeros(n,1);
for i=1:n
density(i)=(data(i,3))/(sum);
end
dens=zeros(1,length(z));
for j=1:length(z)
for i=1:n
if (z(j)>data(i,1)) && (z(j)<=data(i,2))
dens(j)=density(i);
end
end
end
y = zeros(1,2*length(z));
xnew = zeros(1,2*length(z));
xnew(1) = z(1);
xnew(2) = z(1);
y(1) = 0;
y(2) = dens(1);
for i=2:length(z)
xnew(2*i-1) = z(i);
xnew(2*i) = z(i);
y(2*i-1) = dens(i-1);
y(2*i) = dens(i);
end
graph = plot(xnew,y);
end
When I run it for histogram([1 2 2 1 1 1 3 3 2 2 2 1 1 1 4]',3), the plot seems to be biased to the right. It suupose to be like the one on the left, see here : http://oi48.tinypic.com/os4j7d.jpg
Any ides what's the problem? I'm not allowed in this exercise to use other functions besides plot,xlim,ylim,min and max.
Thank's!
Antworten (1)
Doug Hull
am 27 Mär. 2013
Why not use the built in hist command in MATLAB to get a histogram?
1 Kommentar
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