type count8sVector.m

function output = count8sVector( inputVector)
%count number of 8s in a one dimensional array (i.e. a vector)
     numberOfEights = 0;    %set number of observed 8s to zero
     lengthOfInputVector = length(inputVector); %get length of the vector
     for k = 1:lengthOfInputVector    %for k equals 1 to length of vector
        if (inputVector(k) == 8)      %if the kth position of the vector equals 8...
            numberOfEights = numberOfEights + 1;  %increment the number of observed 8s     
            fprintf('k is %d ', k);               %print out the position of this observed 8
	end %end the IF
     end %end of FOR loop
     output = numberOfEights;  %return the number of observed 8s 
end

someVector = [8 0 8]

someVector =

     8     0     8

count8sVector(someVector)
k is 1 k is 3 
ans =

     2

anotherVector = [8 7; 8 8]

anotherVector =

     8     7
     8     8

count8sVector(anotherVector)
k is 1 k is 2 
ans =

     2

type count8sMatrix.m

function output = count8sMatrix( inputMatrix)
%count number of 8s in a two dimensional array (i.e. a matrix)
     numberOfEights = 0; %set number of observed 8s to zero
     lengths = size(inputMatrix);  %get m by n size  of the matrix (m rows, n columns). And it these two dimensions are stored
                                   %in a 1 by 2 array called lengths
     fprintf('size of the matrix m by n is ') %print out... 
     disp(lengths)                            %the dimensions of the matrix
     for m = 1:lengths(1)                     %for m equals 1 to "whatever is in the first index of lengths"
         for n = 1:lengths(2)                 %for n equals 1 to "whatever is in the second index of lengths"
             if  (inputMatrix(m,n) == 8)      %if the mth row and the nth column in the matrix is an eight, then...
                 numberOfEights = numberOfEights + 1;     %  ...increment the number of observed eights
             end
         end %end of FOR loop for the columns
     end  %end of FOR loop for the rows
     output = numberOfEights; %output the number of observed eights
end
     

someMatrix = [8 8 8; 8 0 8]

someMatrix =

     8     8     8
     8     0     8

count8sMatrix(someMatrix)
size of the matrix m by n is      2     3


ans =

     5

diary off