Online Algebra Calculator
Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only. To do this job, it is not useful to download the whole application from a web site.
Function: setelmx (<x>, <i>, <j>, <M>) Assigns <x> to the (<i>, <j>)th element of the matrix <M>, and returns the altered matrix.
<M> [<i>, <j>]: <x> has the same effect, but returns <x> instead of <M>.
(%o1) true (%i2)