CAS command question

01072017, 11:25 AM
(This post was last modified: 01072017 11:26 AM by DrD.)
Post: #48




RE: CAS command question
Thanks for the additional detail, Parisse. "Why" this behavior occurs has by now been very well explained. There still remains inconsistency that is frustrating. The commands for left() and right() do operate as explained, but do not always return results as expected, and do not always return results as desired.
In this thread, we have identified some of the commands outlier's, namely: relations involving the "<" operator, implicit multiplication differences, (exact, versus approximated rationals), and these exceptions extend to user developed programs; the contrasting commands in other CAS system's (giac, Maxima, etc.), and the lack of clarity in help guides. The historical legacy for the current operation is understood. Notwithstanding this legacy, a progressive approach might include two additional new commands, lhs(), and rhs(), to make both the ppl, and CAS more useful, and more consistent with their more robust, but comparable products. Tim, or Cyrille may have further perspective, but as an hp prime customer, and a voice for others who may share similar interest, I would like to ask for two new commands, lhs(), and rhs(), to either replace left() or right(), or be additionally included in the hp prime. Operation is probably clear enough from these related discussions, but is closely illustrated by their counterparts in Matlab or Maxima. Thank you. Dale 

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