# [Maxima] extending limit

Richard Hennessy rich.hennessy at verizon.net
Tue Sep 8 19:16:16 CDT 2009

```I noticed the box function.  I put the matrix inside a call to box, so now you get no problems with calculations.

(%i1) piecewise([minf, und, -1, und, -1, inf, -1, 0, 1, 1, 1, inf, inf], x, 'open,'array);
""""""""""""""""""""""""""""""""""""""""""""""
"[ If  x  in  (  minf  ,  - 1  )  then  und ]"
"[                                          ]"
"[ If  x  in  [  - 1   ,  - 1  ]  then  und ]"
"[                                          ]"
"[ If  x  in  [  - 1   ,  - 1  ]  then  inf ]"
(out1)                                         "[                                          ]"
"[ If  x  in  (  - 1   ,   1   )  then   0  ]"
"[                                          ]"
"[ If  x  in  [   1    ,   1   ]  then   1  ]"
"[                                          ]"
"[ If  x  in  (   1    ,  inf  )  then  inf ]"
""""""""""""""""""""""""""""""""""""""""""""""
(%i2) %+7;
""""""""""""""""""""""""""""""""""""""""""""""
"[ If  x  in  (  minf  ,  - 1  )  then  und ]"
"[                                          ]"
"[ If  x  in  [  - 1   ,  - 1  ]  then  und ]"
"[                                          ]"
"[ If  x  in  [  - 1   ,  - 1  ]  then  inf ]"
(out2)                                       "[                                          ]" + 7
"[ If  x  in  (  - 1   ,   1   )  then   0  ]"
"[                                          ]"
"[ If  x  in  [   1    ,   1   ]  then   1  ]"
"[                                          ]"
"[ If  x  in  (   1    ,  inf  )  then  inf ]"
""""""""""""""""""""""""""""""""""""""""""""""
(%i3) %*k/5;
""""""""""""""""""""""""""""""""""""""""""""""
"[ If  x  in  (  minf  ,  - 1  )  then  und ]"
"[                                          ]"
"[ If  x  in  [  - 1   ,  - 1  ]  then  und ]"
"[                                          ]"
"[ If  x  in  [  - 1   ,  - 1  ]  then  inf ]"
("[                                          ]" + 7) k
"[ If  x  in  (  - 1   ,   1   )  then   0  ]"
"[                                          ]"
"[ If  x  in  [   1    ,   1   ]  then   1  ]"
"[                                          ]"
"[ If  x  in  (   1    ,  inf  )  then  inf ]"
""""""""""""""""""""""""""""""""""""""""""""""
(out3)                                     ------------------------------------------------------
5
(%i4)

Now Maxima does not treat the output like a matrix in calculations.  I wish I noticed the box function sooner.

Rich

```