>> p=v\y
??? Error using ==> mldivide
Matrix dimensions must agree.

>> p=vander([1:4]_
??? p=vander([1:4]_
                  |
Error: Missing variable or function.

>> p=vander([1:4]\((1)./[1:3])
??? p=vander([1:4]\((1)./[1:3])
                               |
Error: Incomplete or misformed expression or statement.

>> p=vander([1:4]\((1)./[1:3]);
??? p=vander([1:4]\((1)./[1:3]);
                               |
Error: Incomplete or misformed expression or statement.

>> p=vander([1:4])\((1)./[1:3]);
??? Error using ==> mldivide
Matrix dimensions must agree.

>> p=vander([1:3])\((1)./[1:3]);
??? Error using ==> mldivide
Matrix dimensions must agree.

>> 
>> xx=1:0.1:3;
>> yy=(1)./xx;
>> pp=polyval(p,xx);
>> plot(xx,yy,'g',x,y,xx,pp);
>> plot(xx,yy,'b',x,y,'+'xx,pp,'r');
??? plot(xx,yy,'b',x,y,'+'xx,pp,'r');
                          |
Error: Missing MATLAB operator.

>> plot(xx,yy,'b',x,y,'+'.xx,pp,'r');
??? plot(xx,yy,'b',x,y,'+'.xx,pp,'r');
                          |
Error: Missing variable or function.

>> plot(xx,yy,'b',x,y,'+',xx,pp,'r');
>> plot(xx,yy,'t',x,y,'+',xx,pp,'r');
??? Error using ==> plot
Error in color/linetype argument.

>> plot(xx,yy,'r',x,y,'+',xx,pp,'r');