> You can use the array
> For example:
Thanks, it is possible, but i need to calculate the determinant, the
inverse matrix and so on. I found the better solution, for example:
(%i1) genmatrix(a,1,1,0,0);
[ a a ]
[ 0, 0 0, 1 ]
(%o1) [ ]
[ a a ]
[ 1, 0 1, 1 ]
(%i2) a[0,0]:x;a[0,1]:y;a[1,0]:z;a[1,1]:t;
(%o2) x
(%o3) y
(%o4) z
(%o5) t
(%i6) a:%o1;
[ a a ]
[ 0, 0 0, 1 ]
(%o6) [ ]
[ a a ]
[ 1, 0 1, 1 ]
(%i7) a:''a;
[ x y ]
(%o7) [ ]
[ z t ]
(%i8) determinant(a);
(%o8) t x - y z
(%i9) a[0,0];
(%o9) x
(%i10)
But, if one changes the order of assignments, maxima gives an error:
(%i1) genmatrix(a,1,1,0,0);
[ a a ]
[ 0, 0 0, 1 ]
(%o1) [ ]
[ a a ]
[ 1, 0 1, 1 ]
(%i2) a:%o1;
[ a a ]
[ 0, 0 0, 1 ]
(%o2) [ ]
[ a a ]
[ 1, 0 1, 1 ]
(%i3) a[0,0]:x;a[0,1]:y;a[1,0]:z;a[1,1]:t;
setelmx: no such element [0, 0]
-- an error. To debug this try: debugmode(true);
setelmx: no such element [0, 1]
-- an error. To debug this try: debugmode(true);
setelmx: no such element [1, 0]
-- an error. To debug this try: debugmode(true);
(%o6)
It is odd behaviour, may be it is bug?