How to count terminate leaves in decision tree?

Question

Radoslav Vandzura 2016-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/269070-how-to-count-terminate-leaves-in-decision-tree

编辑： per isakson 2016-2-21

Hello All. I would like to ask you, exist any way how to count number of terminate leaves in decision tree? For example, I have two kinds of terminate leaves yes|no. I would like to know how many are yes and how many are no from all terminate leaves...Thank you in advance for your answer...

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Answer 1

per isakson 2016-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/269070-how-to-count-terminate-leaves-in-decision-tree#answer_210569

编辑：per isakson 2016-2-21

在 MATLAB Online 中打开

"exist any way how to count number of terminate leaves in decision tree?" &nbsp This is what I found in the R2014a documentation

load ionosphere
my_tree = fitctree(X,Y);
sum(double(not(my_tree.IsBranch)))

which returned "19" for this example (copy&pasted from the documentation).

"how many are yes and how many are no from all terminate leaves" &nbsp after some browsing of the documentation

is_leaf = not(my_tree.IsBranch);
cac = my_tree.NodeClass(is_leaf);
n_g = sum(double(strcmp( cac, 'g' )));
n_b = sum(double(strcmp( cac, 'b' )));
[ n_g, n_b, n_g+n_b ]

outputs