How do I get this graph?

I want to get the graph of n and x(n) on x(n+1)=2.5*x(n)*(1-x(n)), where x(1)=0.9

I wrote

x(1)=0.9;

for n = 1:100,

x(n+1)=x(n)*(1-x(n))*2.5

plot (x(n),n)

end

and my plot is empty

Answer 1

[Ameer Hamza]

Try this

x(1)=0.9;
for n = 1:100
x(n+1)=x(n)*(1-x(n))*2.5;
end
plot(x)

In your code, you are just plotting one point at a time and then overwriting it with a new plot statement.

[Joo Seo Lee]

thanks!

[Ameer Hamza]

Glad to be of help.

Answer 2

[Sriram Tadavarty]

Hi Joo,

The code is calculating as you expected, but not plotting the same because, the plot is getting overwritten with the latest value of x(n).

You can try the following code modifications:

Option 1:

Use hold on to update the figure for each iteration

x(1)=0.9;
for n = 1:100
x(n+1)=x(n)*(1-x(n))*2.5;
plot(n,x(n),'*') % Plotting at each point, line doesn't help, so try symbols
hold on
end

Option 2:

Plot x after the computation

x(1)=0.9;
for n = 1:100
x(n+1)=x(n)*(1-x(n))*2.5;
end
plot(x)

Hope this helps.

Regards,

Sriram