No graphs after plot command

Hello everybody; I have a question about plot command. When i run the script, there is no error message but empty figure has appeared. I couldn't solve this problem using gcf or noFigure = 1; figure(noFigure); command. What should i do to see the graph? Thanks for your help

[Geoff Hayes]

Semiha - what is the script that you are using? What code is being used to plot something to the figure? Please provide more details.

[Star Strider]

semiha’s ‘Answer’ moved here ...

a = 100;
m = 1000;
n = 1000;
h = a/m;
t1 = 100;
k = t1/n;
x = 0:h:a;
t = 0:k:t1;  
D = -k;
w0 = zeros(1,m+1);
w = zeros(n+1, m+1);
A = zeros(m+1, m+1);
B = zeros(m+1, m+1);

for j = 1:m+1
    w0(j)  = (1-(5*(1-3*i))/((1+6*(x(j)^3))));
end

w(1,:) = w0;

for p=1:n  
for j=1:m+1
      A2 (j)= k*1*i;
      A(j,j) = A2(j);
end   

for j=1:m
    A(j,j+1) = 1 - 1i*D*abs(w(p,j)).^2;
end

for j=1:m-1
    A(j,j+2)=k*1*i;
end

A(m,m)=k*1*i;
A(m,1)= 1 - 1i*D*abs(w(p,j)).^2;
A(m,2)=k*1*i;
A(m-1,1)=k*1*i;
A(m-1,m)= 1 - 1i*D*abs(w(p,j)).^2;
A(m-1,m-1)=k*1*i;

r =(A)*w(p,1:m+1)';
w(p+1,1:m+1)=r';

end

plot3 ( x, t,(abs(w(n,:))) );

Answer 1

[emehmetcik]

Your output variable "w" mostly consists of "nan" (not a number) values. Probably the result of zero divided by zero at some point.

Only the first few rows of "w" have no nan's.

[semiha]

Firstly thanks for reply I'm a bit confused about fixing it. Should i change variables to get a solution?

[emehmetcik]

I'm not quite sure what the code does. But the problem seems to be that some values grow exponentially.

My recommendation is that you should re-check your code. The following commands can be useful as well:

dbstop if naninf

This will automatically put a debug point when a nan or inf value is encountered while the code is being executed.

dbclear all % To clear all debug points

[semiha]

yes you are right i used dbstop if naninf command, it seems that one line creates this situtation. ( A(j,j+1) = 1 - 1i*D*abs(w(p,j)).^2) i should use this line to get a correct answer, but i will try to change it. Thanks