why polybuffer example doesn't work ?

Question

Faez Alkadi 2018-4-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/395512-why-polybuffer-example-doesn-t-work

评论： Faez Alkadi 2018-4-17

采纳的回答： Guillaume

在 MATLAB Online 中打开

I'm trying to use the function polybuffer for 2-D points or lines as in example:

https://www.mathworks.com/help/matlab/ref/polybuffer.html

P = [0 0; 1 1; 2 1];
polyout = polybuffer(P,'points',0.25)
plot(P(:,1),P(:,2),'r.','MarkerSize',10)
hold on
plot(polyout)
axis equal

or

 P = [0 0; 1 1; 2 1];
polyout1 = polybuffer(P,'lines',0.25);
plot(P(:,1),P(:,2),'r.','MarkerSize',10)
hold on
plot(polyout1)
axis equal
hold off

but keep getting the following error:

Undefined function 'polybuffer' for input arguments of type 'double'.

Though the function works fine when using the following example:

https://www.mathworks.com/help/matlab/ref/polyshape.polybuffer.html

 polyin = polyshape({[0 0 1 3],[0.5 1.5 1.5 0.5]},{[0 3 3 0],[0.5 0.5 1.5 1.5]});
 plot(polyin)
 polyout1 = polybuffer(polyin,0.1);
 hold on
 plot(polyout1)
 hold off

does anyone have an idea what did i do wrong ?

Thank you so much

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Guillaume 2018-4-17

polyshape requires R2017b or later, but polybuffer is even newer and requires the latest version: R2018a.

Faez Alkadi 2018-4-17

编辑：Faez Alkadi 2018-4-17

在 MATLAB Online 中打开

Hi John,

My matlab is R2017b. And as i said in the question polyshape is working fine with the last example.

i run ver and got the following :

MATLAB                                                Version 9.3         (R2017b)   
Simulink                                              Version 9.0         (R2017b)   
Control System Toolbox                                Version 10.3        (R2017b)   
DSP System Toolbox                                    Version 9.5         (R2017b)   
Data Acquisition Toolbox                              Version 3.12        (R2017b)   
Image Processing Toolbox                              Version 10.1        (R2017b)   
Instrument Control Toolbox                            Version 3.12        (R2017b)   
Mapping Toolbox                                       Version 4.5.1       (R2017b)   
Optimization Toolbox                                  Version 8.0         (R2017b)   
POLYGONS Manipulation of planar polygons and po...    Version 1.6         21-Mar-2011
Signal Processing Toolbox                             Version 7.5         (R2017b)   
Simulink Control Design                               Version 5.0         (R2017b)   
Statistics and Machine Learning Toolbox               Version 11.2        (R2017b)   
Symbolic Math Toolbox                                 Version 8.0         (R2017b)   
>>