why polybuffer example doesn't work ?

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I'm trying to use the function polybuffer for 2-D points or lines as in example:
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:
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
  3 Comments
Faez Alkadi
Faez Alkadi on 17 Apr 2018
Edited: Faez Alkadi on 17 Apr 2018
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)
>>

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Accepted Answer

Guillaume
Guillaume on 17 Apr 2018
Edited: Guillaume on 17 Apr 2018

does anyone have an idea what did i do wrong

Yes, most likely you're not using R2018a, which, for now, is the only version where polybuffer is implemented.

  1 Comment
Faez Alkadi
Faez Alkadi on 17 Apr 2018
Thank you Guillaume, i just updated my matlab to R2018a And it is working now.

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