Indices on the left side are not compatible with the size of the right side error

Question

Vishwak Tejasri Turaga 2019-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/449452-indices-on-the-left-side-are-not-compatible-with-the-size-of-the-right-side-error

评论： Vishwak Tejasri Turaga 2019-3-11

So I'm writing code to create a matrix, M that stores various values for theta and x, but i'm unsure as to what to do about the error. Please let me know what I need to correct in order to overcome the error.

M=[];

theta=linspace(0,180,401);

x=linspace(0,10,501);

for i_theta = 1:length(theta)

for i_x = 1:length(x)

M(i_x,i_theta)= 1200*sind(theta(i_theta)) +400*cosd(theta)*x(i_x);

end

****************************************************************************

Unable to perform assignment because the indices on the left side are not compatible with the

size of the right side.

Error in Lab7 (line 9)

M(i_x,i_theta)= 1200*sind(theta(i_theta)) +400*cosd(theta)*x(i_x);

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Answer 1

Alex Mcaulley 2019-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/449452-indices-on-the-left-side-are-not-compatible-with-the-size-of-the-right-side-error#answer_364854

在 MATLAB Online 中打开

It's a typo in this line

M(i_x,i_theta)= 1200*sind(theta(i_theta)) +400*cosd(theta)*x(i_x);

I think it should be

M(i_x,i_theta)= 1200*sind(theta(i_theta)) +400*cosd(theta(i_theta))*x(i_x);

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Vishwak Tejasri Turaga 2019-3-11

Thank you! Makes sense as to why the indexing was not working

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Answer 2

Kevin Phung 2019-3-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449452-indices-on-the-left-side-are-not-compatible-with-the-size-of-the-right-side-error#answer_364856

在 MATLAB Online 中打开

M=[];
theta=linspace(0,180,401);
x=linspace(0,10,501);
 
for i_theta = 1:length(theta)
    for i_x = 1:length(x)
        M(i_x,i_theta)= 1200*sind(theta(i_theta)) +400*cosd(theta(i_theta))*x(i_x);
    end
end