Question

Given a matrix variable "mat", write code using for loops, if statements, etc. that will accomplish the same as the following:

matsum = sum(mat')

Please make sure to store the result in "matsum"!

% mat has been initialized for you:

mat = randi([-100,100],randi([15,20]),randi([15,20]));

% write your statements that accomplish the code above:

Answer 1

%matlab code

% matrix with randomn values between -100 and 100
mat = randi([-100,100],randi([15,20]),randi([15,20]));
% matsum stores the sum of every column
matsum = sum(mat)

[row, column] = size(mat);
for i=1:column
sum = 0;
for j=1:row
sum = sum + mat(j,i);
end
fprintf('Sum of column %d:',i);
disp(sum);
end

% end matlab code

%{
output:

matsum =
Columns 1 through 13:
-351 295 -103 183 -353 -335 -304 271 -475 -434 187 116 323
Columns 14 through 18:
151 45 -27 43 131

Sum of column 1:-351   
Sum of column 2: 295
Sum of column 3:-103
Sum of column 4: 183
Sum of column 5:-353
Sum of column 6:-335
Sum of column 7:-304
Sum of column 8: 271
Sum of column 9:-475
Sum of column 10:-434
Sum of column 11: 187
Sum of column 12: 116
Sum of column 13: 323
Sum of column 14: 151
Sum of column 15: 45
Sum of column 16:-27
Sum of column 17: 43
Sum of column 18: 131

%}