MATLAB: How to count the number of leaves in a tree

componentsImage Processing Toolboxmonte carlo

how to count the number of leaves in a tree? Is that possible? If yes. what techniques can be used. Input is a tree image.

Best Answer

You need to find the area of a tree. And you need to know the area of a leaf. Then what you could do is to do a Monte Carlo simulation where you place each leaf, at a 3D x,y,z location, at some arbitrary angle, and find the projected area. Then you can make a correspondence between number of leaves and area fraction. Essentially a lookup table. Then to find the number of leaves for a certain area fraction, use find() to just look it up.

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MATLAB: Format number in fprintf

I am guessing that unlike your example you actually want the columns to be aligned, e.g. where M is your matrix:

>> fprintf(' %9d %9.6f %15.6f %15.6f\n',M.')
         1  0.000000        0.000000        0.000000
         2  0.000000        0.000000        4.000000
         3  0.000000        0.000000        1.000000
         4  0.000000        0.000000        2.000000
         5  0.000000       11.000000        4.000000
         6  0.000000       12.000000        4.000000
         7  0.000000       13.000000        4.000000
         8  0.000000       14.000000        4.000000
         9  0.000000       15.000000        4.000000
        10  0.000000       16.000000        4.000000
        11  0.000000       17.000000        4.000000
        12  0.000000       18.000000        4.000000
        13  0.000000       12.000000        0.000000
        14  0.000000       11.000000        0.000000
        15  0.000000       10.000000        0.000000

MATLAB: How to count terminate leaves in decision tree

"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

ans =
       6    13    19

Best Answer

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MATLAB: Format number in fprintf

MATLAB: How to count terminate leaves in decision tree

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