convert xi to i

Hello,

I have created a regression tree and I have printed the cut predictors which are the variables that were used in each branch.

It gives me a cell array like this: 'x2' 'x1' 'x1'

I need these to be converted into numerical values. Instead of 'x2' I need 2 or instead of 'x1' I need 1

How should I do this conversion?

Thank you

Answer 1

[madhan ravi]

 ix = ismember(cell_array, 'x1') % strcmp()

 Wanted = ix + 2 * ~ix

[madhan ravi]

 Wanted = str2double(regexprep(cell_array, '\D*', ''))

[Parisa Keshavarz]

Thank you so much

[Parisa Keshavarz]

I have one more question, I need to have a logical matrix that has n=the number of instances and tl=number of leaves in my decision tree

I want it to be 1 if instance i is in leaf j for example and 0 otherwise. does such a function for this already exist? If not how should I do it?

[madhan ravi]

That’s a new question and I don’t know how it’s related to this question.