if elseif end error

Question

Sungmin Na 2018-4-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/391941-if-elseif-end-error

回答： Manan Mishra 2018-4-4

hi i got some error during use matlab

function [r,theta] = matlab36
x = [2 2 0 -3 -2 -1 0 0 2];
y = [0 1 3 1 0 -2 0 -2 2];
r = sqrt((x.^2)+(y.^2));
if x>0
    theta = atan(y./x);
end
if x<0
    if y>0
        theta = atan(y./x)+pi;
    elseif y<0
        theta = atan(y./x)-pi;
    elseif y==0
        theta = pi;
    end
end
if x==0
    if y>0
        theta = pi/2;
    elseif y<0
        theta = -pi/2;
    elseif y==0
        theta = 0;
    end
end

the answer says there is no any substitution value 'theta' i don't know how can i fix this error

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Answer 1

Manan Mishra 2018-4-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/391941-if-elseif-end-error#answer_313420

I was not able to reproduce the same error on my end. However the issue could be because the output theta is not being assigned during the function call.

This is because none of the if-statements under which theta is assigned are being executed.