I have to implemet a state feedback design using SOS, but i got this Error, (its just a simple example) , what should i do ? (Matlab-R2010b)

>> syms x y

>> VEC = monomials([x; y],[1 2 3])

??? Error using ==> sprintf Function is not defined for sparse inputs.

Error in ==> int2str at 32 s = sprintf(['%', formatConversion], x);

Error in ==> mysympower at 44 charexpr = [charexpr,char(vartable(i)),'^',int2str(Z(j,i)),'*'];

Error in ==> monomials>oldconstructZ at 98 Z = mysympower(vartable,Z);

Error in ==> monomials at 71 Z = [Z; oldconstructZ(vartable,i)];

[Walter Roberson]

Which toolkit or File Exchange did you get monomials() from?

[derecho]

i think it's coming from sostools or sedumi , cuz i had to install both of them to implement the desired design

Answer 1

[Walter Roberson]

Okay, you will need to go into the mysympower.m file, and where it has

   charexpr = [charexpr,char(vartable(i)),'^',int2str(Z(j,i)),'*'];

on line 44, change that to

   charexpr = [charexpr,char(vartable(i)),'^',int2str(full(Z(j,i))),'*']

[derecho]

yes it work now!! thank you :)