MATLAB CODE: function [density] = myCalculateDensity( X ) a. INPUTS: A 2D matrix

Question

MATLAB CODE:

function [density] = myCalculateDensity( X )

a. INPUTS: A 2D matrix X. For this project, each element of X will represent a pixel of bone. The higher the number, the higher the density of that little square of bone.

b. FUNCTIONALITY: i. This function calculates the average density of all non-zero elements of a matrix X.

c. OUTPUTS: i. density

d. TEST CASE:

>> A = [176.2360 171.0640 115.8960 162.4440; 207.2680 179.6840 0.0000 0.0000; 233.1280 190.0280 145.2040 146.9280; 248.6440 177.9600 181.4080 164.1680];

>> myCalculateDensity(A)

ans =

178.5757

Explanation / Answer

function [density] = myCalculateDensity(X)
m = length(X);
n = size(X,1);
sum = 0.0;
count = 0.0;
for i = 1:m
for j = 1:n
if X(i,j) != 0
sum = sum + X(i,j);
count = count+1;
endif
end
endfor
density = double(sum) / double(count);

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