numbered_symbols in xcas

[george]

Hi, need help immediatly. Anyone knows how to create a list o f numbered symbols in order to be used as unidentified coefficients on a polynomial.

[frederic han]

Hello,

you have different ways.
1) just use a free name with the array syntax:

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P:=sum(a[j]*x^j,j=0..10);

you can do the same for a matrix:

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B:=matrix(5,5,(u,v)->a[u,v]);
det_minor(B);

or
2) convert a string to a symbol via the # function:

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Q:=sum(#("a"+j)*x^j,j=0..5)