matlab 路径不对,求助：matlab function说我输出未指定执行路径，剖析错误

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输入正弦，程序如下：function y =fcn(u)

if(u>=0&&u

y=-6;

elseif(u>=pi/3&&u<2*pi/3)

y=0;

elseif(u>=2*pi/3&&u

y=6;

elseif(u>=pi&&u<4*pi/3)

y=6;

elseif(u>=4*pi/3&&u<5*pi/3)

y=0;

elseif(u>=5*pi/3&&u<2*pi)

y=-6;

end

=============================================================

Output argument 'y' is not assigned on some execution paths.

Function 'MATLAB Function3' (#178.9.10), line 1, column 10:

"y"

Launch diagnostic report.

Errors occurred during parsing of MATLAB function 'MATLAB Function3'(#178)

Code Directory :

"D:\Program Files\MATLAB\slprj\_sfprj\temp\_self\sfun\src"

Machine (#73): "temp" Target : "sfun"

Chart "MATLAB Function3" (#178):

.

Code generation failed Errors occurred during parsing of MATLAB function 'MATLAB Function3'(#178)

Errors occurred during parsing of MATLAB function 'MATLAB Function3'(#178)