i dont get why it says Unrecognized function or variable 'Nbin when i run it

clear

clc

clf

sum1=0;

N = 10000;

xx=0:0.01:19;

y1=(xx/2.89).*exp(-xx.^2/5.78);

plot(xx,y1,'b','linewidth',3)

hold on

y=rand(1,N); %y=0:0.01:19;

x=1.7*sqrt(-2*log(y));

sum1=sum1+x;

plot(x,y,'r','linewidth',3)

hold on %den petuxenoume siglisi ton 2 diagramaton

mesi_timi_theoritiki=sqrt((pi*2.89)/2);

mesi_timi_peiramatiki=sum1/N;% oi peiramatiki mesi timi einai migadikis morfhs

x=katanomi1(N);

[count,center]=hist(x,Nbin);

Delta=center(2)-center(1);

pithanotita=count/N;

piknotita=pithanotita/Delta;

hold on

plot(center,piknotita,'ro','linewidth',3)

hold off

set(gca,'frontsize',16)

xlabel('Τιμές της τυχαίας μεταβλητής')

ylabel('Πυκνότητα πιθανότητας')

title('Συνάρτηση πυκνότητας πιθανότητας (pdf)')

[Torsten]

Yes, you must give a value to Nbin when you call "hist".

Answer 1

[Mike Croucher]

It's because you have this line

[count,center]=hist(x,Nbin);

Nbin needs to be defined as the number of bins you want in the histogram and you have not defined it.

Try this:

clear
clc
clf
sum1=0;
N = 10000;
Nbin = 10;   % Number of bins for histogram
xx=0:0.01:19;
y1=(xx/2.89).*exp(-xx.^2/5.78);
plot(xx,y1,'b','linewidth',3)
hold on
y=rand(1,N); %y=0:0.01:19;
x=1.7*sqrt(-2*log(y)); 
sum1=sum1+x;
plot(x,y,'r','linewidth',3)
hold on %den petuxenoume siglisi ton 2 diagramaton 
mesi_timi_theoritiki=sqrt((pi*2.89)/2);
mesi_timi_peiramatiki=sum1/N;% oi peiramatiki mesi timi einai migadikis morfhs
x=katanomi1(N);
[count,center]=hist(x,Nbin);
Delta=center(2)-center(1);
pithanotita=count/N;
piknotita=pithanotita/Delta;
hold on
plot(center,piknotita,'ro','linewidth',3)
hold off
set(gca,'frontsize',16)
xlabel('Τιμές της τυχαίας μεταβλητής')
ylabel('Πυκνότητα πιθανότητας')
title('Συνάρτηση πυκνότητας πιθανότητας (pdf)')