(%i1) e : a^2 + b^2 + c^2;

2 2 2

(%o1) c + b + a

(%i2) ratsubst(r^2, a^2 + b^2 + c^2, e);

2

(%o2) r

(%i3) e : - 3 * a^2 - 3 * b^2 - 3 * c^2;

2 2 2

(%o3) - 3 c - 3 b - 3 a

(%i4) ratsubst(r^2, a^2 + b^2 + c^2, e);

2

(%o4) - 3 r

## Monday, June 9, 2008

### substitute expressions in Maxima

From the Maxima mailing list: Say you want to substitute one expression for another, also dealing with the case in which the expression to be replaced is multiplied by some constant.

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