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

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blues 2018-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/429691-how-to-fix-the-following-index-exceeds-matrix-dimensions-issue

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% image 1:
image = fopen('image1.raw', 'r');
a1 = fread(image,'float32');
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');
a2 = fread(image,'float32');
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

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Guillaume 2018-11-14

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 2018-11-14