Plotting classification boundary?

I would like to plot the classification boundary for t开发者_JAVA技巧he model obtained using Logistic Regression in Matlab. Solutions other than in Matlab are welcome but I will need access to Logistic Regression code for modification.

The documentation to multinomial logistic regression in Matlab shows two examples of how to draw classification boundaries.

If that's not what you need, you need to clarify your question, specifying how your case is different.