How to divide elements with 4 points in triangles?

ele = [1 2 5 4; 2 3 6 5; 4 5 8 7; 5 6 9 8];

% ele is a matrix with 4 rows and 4 columns

% Now T shall divide each row in 2 triangles (row with three columns), where the first row gets the first three values of each element row and the second row gets the 2 last values of a element row and at least the first one.

% for example = T(1,:) = [1 2 5], T(2,:) = [5 4 1]

Answer 1

[Ralf Steinhahn]

s = size(ele,1);

T = zeros(s,3);

for i = 1:4

for j = 1:3

T(2*i-1,j) = ele(i,j);

end

for j = 3:4

T(2*i,j-2) = ele(i,j);

end

T(2*i,3) = ele(i,1);

end