scatter plot in matlab

Hi,

I'm new to Matlab. And I need to write a congruential random number generator without using RAND().And then plot the Ui vs Ui+1

My code is:

>> syms m x a u z;

>> x=1;

>> a=16807;

>> m=2^31-1;

>> for i=1:10

y=a*x

x=mod(y,m)

u(i)=x/m %store u value

end;

>> for i=1:10

end;

>> scatter(u(i+1),u(i))

I got this"Index exceeds matrix dimensions." error message.

Anyone who can tell me how to plot my ui vs ui+1? I think my code does generate correct ui values.

I'm using it for tomrrow's class.

Thanks very much!

Answer 1

[the cyclist]

I think you should be able to do the scatter plot you want using:

 scatter(u(2:end),u(1:end-1))

The reason you got the error you did is that i is equal to 10, so in the scatter command you are trying to access the ( i+1 )th element of u. But u is only a 10-element vector, of course.

[Ying]

the cyclist,

Thanks a lot for answering my question! This looks identical to my excel scatter output. I think this should be fine for my class.

Ying