# Repetitive value arising in for loop

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Amit Chakraborty 2021 年 12 月 13 日

This is small part of my code. I use a parfor loop here which is required for my project.
There are 60 different types of angle. But in my following code insted of taking all 60 types of diferent angle it is taking only 1 angle( the 60th poistion angle ). As result I am getting only one value for "a" and that repreated for the size of Npixels which is wrong. Can any one help me to tackle this problem?
If you run the code and see the : "Cords" variable your will find the "a" is repeated over the size of Npixels .
CODE::::::
Nangles = 60; % Total Angles
Nvoxels = 64^3 ;
Npixels = 256*256;
startPhi = 0;
endPhi = 354;
zs = 1100;
zd = -400;
FOV= 460;
xv = FOV/2 ;
yv = FOV/2;
zv = FOV/2;
Nx = nthroot(Nvoxels,3);
Ny = nthroot(Nvoxels,3);
Nz = nthroot(Nvoxels,3);
d = FOV/Nx;
dz = d;
B= [xv+(-1).*zs.*sin(theta),yv,zv+zs.*cos(theta),1];
Kai= repmat(B(:,1),Npixels,1);
Shai = repmat(B(:,2),Npixels,1);
G = repmat(B(:,3),Npixels,1);
sourceCords = [Kai,Shai,G];
%% TEST
IntersectionPts_Global = zeros((Npixels),4);
for k = 1:Nangles
phi = Phi(k);
parfor i = 1:Npixels
kai = Kai(i);
shai = Shai(i);
g = G(i);
a =(zd+zv.*cos(phi+theta)+(-1).*xv.*sin(phi+theta)).*(g+zs+zv.*cos(phi+theta)+(-1).*xv.*sin(phi+theta)).^(-1).*(xv+kai.*cos(phi+theta)+(-1).*(g+zs).*sin(phi+theta));
b=0;
c=0;
InterPts_Global = [a,b,c,ones(length(a),1)];
IntersectionPts_Global(i,:) = InterPts_Global;
end
Cords = squeeze(IntersectionPts_Global(:,1:3));
end

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### 採用された回答

Raymond Norris 2021 年 12 月 13 日
Please edit your posting so that it displays your code in CODE mode.
This is not a parfor issue, you'd get the same results with for-loop as well. Just to be clear, should
Cords =
be
Cords(:,:,k) =

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