I am trying to find a dataset which is linearly non-separable. I checked the Iris dataset and the UCI website says:
The data set contains 3 classes of 50 instances each, where each class refers to a type of iris plant. One class is linearly separable from the other 2; the latter are NOT linearly separable from each other
However, I need a two class dataset which is linearly non-separable.
Please give some pointers.