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Asked by Nina on 28 Dec 2012

Hi all,

I'm trying to do the following:

% simulate a Poisson process with rate \lambda = 3/2 lambda = 3/2; % MATLAB function poissrnd uses the waiting time method random_sample = poissrnd(lambda, 1, 4000)

% estimate the distribution p = poisscdf(random_sample, lambda)

% plot the distribution x = min(random_sample):1:max(random_sample) y = double(poisscdf(x, lambda)) z = x+1 plot(z,y)

but I keep getting this error message. Does anyone know what could the problem be?

Thanks a lot!

Answer by Jan Simon on 28 Dec 2012

Edited by Jan Simon on 28 Dec 2012

Accepted answer

I can guess only at the moment, that one of the commands has been defined as variable before, e.g. `poissrnd`, `poisscdf`, `min`, `max`, `double` or `plot`. The standard procedure to locate the problem is using the debugger:

dbstop if error

Then run your program again until Matlab stops in the line, which causes the error. Now let `which min -all` or whatever commands are used in the line show you the definition of the symbols. In general, avoid to use names of built-in functions as names of variables, because this causes problems frequently.

## 2 Comments

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/57544#comment_119513

Please post a copy of the error message, which reveals e.g. the line, which causes the error.

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/57544#comment_119657

Actually, it worked well after I tried to run it again. Thanks for your time!