how to find the value fmincon is trying

Hi fellows,

I am using fmincon to find the minimum of function f. Sometimes it gets a value of f is NaN , so fmincon fails to converge. Do you know how to find what value that fmincon is trying when it gets f as NaN?

Answer 1

[Walter Roberson]

At the command prompt give the command

dbstop if infnan

and run. When it stops you can examine the parameters passed in to your function.

[xueqi]

Hey. Could you also tell me how to examine the parameters? I am not sure where to find them....

[Walter Roberson]

Look at

whos

and look at the parameter names you gave when you wrote the function and ask to look at those parameters. "x" is pretty common for this purpose.