Why do I get "array indices must be positive integers or logical values" when running this for loop?

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Spencer Checkoway
Spencer Checkoway 2020-7-29
评论： Spencer Checkoway 2020-7-29
i_theta_max =100;
for i_theta = 0:i_theta_max
theta = i_theta/(i_theta_max)*2*pi;
xcoord(i_theta)=1*sin(theta);
ycoord(i_theta)=1*cos(theta);
end

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Sriram Tadavarty
Sriram Tadavarty 2020-7-29
Hi Spencer,
The access of i_theta in xcoord and ycoord is the issue. In MATLAB, indexing is one based.
Try to update as folllowing:
i_theta_max =100;
for i_theta = 0:i_theta_max
theta = i_theta/(i_theta_max)*2*pi;
xcoord(i_theta+1)=1*sin(theta); % Added 1
ycoord(i_theta+1)=1*cos(theta); % Added 1
end
% or
i_theta_max =100;
for i_theta = 1:i_theta_max+1
theta = (i_theta-1)/(i_theta_max)*2*pi; % Subtract 1
xcoord(i_theta)=1*sin(theta);
ycoord(i_theta)=1*cos(theta);
end
Hope this helps.
Regards,
Sriram

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