Hi, I'm new to matlab and I need help. I'm supposed to make a m x n matrix called M and it's elements are -1, 1 and 0.
I need to write a function called d(x,y) which returns 1 if (x = -1) and (y = 1). And returns 0 otherwise.
and another function called h(m(i),m(k)) which calculates the sum of d(m(i,j),m(k,j)) in every column and it is defined to find the distance between row i and row k:
For example Suppose M = [-1 0 -1; 1 -1 -1; 0 1 1].
If I calculate h for the 1st row and 2nd row(i = 1 and k = 2) it's Sum of d(m(1,j),m(2,j) for j from 1 to 3 which is d(m11,m21) + d(m12,m22) + d(m13,m23) = d(-1,1) + d(0,-1) + d(-1,-1) = 0+ 0 + 0 =0 .
Then I need h for every pair of rows. I'm confused. I tried writing d function as follows:
function d = d( x, y )
if (x==1) & (y==-1)
d = 1;
else
d = 0;
end
end
Then I tried to find h for row 1 and row 2 of the example matrix:
M = [-1 0 -1; 1 -1 -1; 0 1 1];
m=size(M,1);
n=size(M,2);
for i=1:2
h = sum(d(M(i,1:n)));
end
h returns 0 and works fine. I need to repeat this for every pair of matrix rows. For example for M which has 3 rows there will be 3 pairs of rows (3 choose 2) and h must be 1 x 3 (one sum for every pair).
