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# How to fix the following: Index exceeds matrix dimensions issue?

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blues on 13 Nov 2018
Closed: MATLAB Answer Bot on 20 Aug 2021
% image 1:
image = fopen('image1.raw', 'r');
p1 = reshape(a1,100,100,100);
j = 0; X1 = 50; Y1 = 50; Z1 = 50;
for i = 1:1:49; j = j+1; mat = 0;
for k = 0:2:358;
x = i*cosd(k);
y = i*sind(k);
Xc = X1+(x/1);
Yc = Y1+(y/1);
XR1 = round(Xc);
YR1 = round(Yc);
mat = mat + p1(XR1,YR1,Z1);
energy = mat/180;
end
D(j,1) = i;
D(j,2) = (energy/(0.0005*0.0005*0.0005*1000));
end
% image 2
image = fopen('image2.raw', 'r');
p2 = reshape(a2,100,100,100);
j = 0; X2 = 50; Y2 = 50; Z2 = 50;
for i = 51:5:149; j = j+1;
for k = 0:2:358;
x = i*cosd(k);
y = i*sind(k);
Xc = X2+(x/1);
Yc = Y2+(y/1);
XR2 = round(Xc);
YR2 = round(Yc);
mat = p2(XR2,YR2,Z2); %---------------->>>>>> Index exceeds matrix dimension!!!
energy = mat/180;
end
D(j,1) = i;
D(j,2) = (energy/(0.0015*0.0015*0.0015*1000));
end
Guillaume on 14 Nov 2018
Could you please explain how XR2 and YR2 becomes 101 and 50?
If you can't figure it out yourself, then I recommend you use the debugger to step through your code one line at a time and see the actual values calculated.This is the most efficient way for you to understand why your program doesn't do what you expected it to do.
blues on 14 Nov 2018
Thank you Bob and Guillaume for your help and advice.