MATLAB: Matlab error that I can’t figure out please help!

matrix manipulation

I'm working with the code that I will show below and I keep on getting the error:
 "Subscript indices must either be real positive integers or logicals.
Error in opticalflow2D (line 62)
f5 = X1(( ndxm.*cos(1)+ndxn.*sin(1) ));"
if true
  X1 = [
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
];
if true
X2 = [
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0 
0 0 0 0 0 1 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0
];
%imtool(X1)
%imtool(X2)
delta=1;
[fm,fn] = size(X1);
ndxm = 1+delta:fm-delta;
ndxn = 1+delta:fn-delta;
X1(ndxm)
f0 = X1(ndxm,ndxn);
fz = X2(ndxm,ndxn);
f1 = X1(ndxm,ndxn+delta);
f2 = X1(ndxm,ndxn-delta);
f3 = X1(ndxm+delta,ndxn);
f4 = X1(ndxm-delta,ndxn);
f5 = X1(( ndxm.*cos(1)+ndxn.*sin(1) ), ( ndxm.*sin(1)+ndxn.*cos(1) ));
f6 = X1(( ndxm.*cos(-1.)+ndxn.*sin(-1) ), ( ndxm.*sin(-1)+ndxn.*cos(-1) ));
end
end
Thank you!!

Best Answer

Take the semicolons off these lines
ndxm = 1+delta:fm-delta
ndxn = 1+delta:fn-delta
so you'll see their values. Then go to this link.
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