How to set maximum depth of decision tree for post prunning on matlab?

Question

How do I build a tree which has a depth that i want? For example i want to create a decision tree which has a only 3 depth.

load ionosphere 
treeModel = fitctree(X,Y) 
view(treeModel) 
view(treeModel,'mode','graph')

This code create 7 depth tree. I use same data set but i want to create tree which has 3 or 2 depth. How can I do on matlab?

Answer 1

You can control the maximum depth using the MaxDepth name-value pair argument.

Read the documentation for more details.

treeModel = fitctree(X,Y,'MaxDepth',3);

Answer 2

Try to be as flexible as possible when building up Matlab environments. Also, as per official documentation, note that the MaxDepth option only applies when using fitctree on tall arrays.

load ionosphere 
treeModel = CreateTreeModel(X,Y,3);
view(treeModel) 
view(treeModel,'mode','graph')

function tm = CreateTreeModel(x,y,depth)
    if (nargin < 3)
        tm = fitctree(x,y);
        return;
    end

    if (depth < 1)
        depth = 1;
    end

    tm = fitctree(x,y,'MaxDepth',depth);
end