Matlab - ??? Index exceeds matrix dimensions [closed] - matlab

Question

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.
Closed 10 years ago.
I have the following code (part of a larger program) in matlab:
while(k<n)
C.(sprintf('Cnew')) = C.(sprintf('C%d',k));
d1 = equalize_dimension(a.F, C.(sprintf('Cnew')));
distance_new = distance(d1.x, d1.y);
k = k + 1;
end
If you want to substitute values since I have included part of the program, this would be as follows:
C.(sprintf('Cnew')):
78
And, for a.F it is as follows:
78 82 84 80
80 84 86 82
82 87 88 85
82 87 89 86
For the equalize_dimension(x,y) function, it is as follows:
function n = equalize_dimension (x,y)
[r1 c1] = size(x);
[r2 c2] = size(y);
if r1<r2
e= r2-r1;
for i=1:e
x(r1+1,1)=0;
r1 = r1 + 1;
end
[r1 c1] = size(x);
n.x =x;
n.y = y;
end
if r1>r2
e = r1-r2;
for i=1:e
y(r2+1,1)=0;
r2 = r2 + 1;
end
[r2 c2] = size(y);
n.x = x;
n.y = y;
end
if c1<c2
e= c2-c1;
for i=1:e
x(1,c1+1)=0;
c1 = c1 + 1;
end
[r1 c1] = size(x);
n.x = x;
n.y = y;
end
if c1>c2
e = c1-c2;
for i=1:e
y(1,c2+1)=0;
c2 = c2 + 1;
end
[r2 c2] = size(y);
n.x = x;
n.y = y;
end
if r1==r2 && c1==c2
n.x = x;
n.y = y;
end
And, for the distance(x,y) function, it is as follows:
function m = distance(x,y)
[r c] = size(x);
for i=1:r
for j=1:c
summation = (sum(sum(pdist2(x,y))));
end
end
m=summation;
end
When I run the program, I get the following error:
??? Index exceeds matrix dimensions.
Error in ==> fs at 36
distance_new = distance(d1.x, d1.y);
Why is that?
Thanks.

Answer 1

First of all, stop in debugger before line distance_new = distance(d1.x, d1.y);
and type
>> which distance
I suspect that you'll get as output
distance is a variable.
Meaning that you override the function distance by using a variable with the same name.
Second, in function distance what is the reason for the nested loop on i and j? You are not using these variables and summation is computed regardless of the nested loops.
please also try not to use i and j as variables.