CAS command question

[DrD]

Indeed, your points are all well taken. In spite of my insistence that the CAS commands, on which this thread is built, are incomplete, I, very much, appreciate and respect your differing opinion.

I am not sure that there is a strict definition of CAS, i.e, Computer Algebra System, to the extent of this topic. HP prime CAS includes the commands left() and right(), and it both alludes to, and is comparable to, similar commands in other Computer Math Systems, as noted earlier. You have pointed out that Giac has been extended to strings, and that point is crucial. These commands NEED to be extended to strings, because academia needs a way to input relations as objects, and be able to separate the relations' expressions, in order to further process them. CAS commands like coeff(), and Home commands like EXPR(), require expression arguments. Many external tools exist, so, sure, programmer's can use other products, custom-designed, or self-written; but that's not the point.

The problem in need of a solution, is that hp prime needs better facilities for handling function objects as string objects. The difference being evaluation, or not. The arguments, pro and con, are within this thread, and the outcome is not satisfactory: requiring hp prime customers to bridge this divide by self-written programming techniques. The prime, as designed for educators/students, should not, (necessarily), require experienced tailors to be able to stitch around it's incompatibilities.

We are at, if Mr. Trump will please excuse the analogy, the "wall." You seem to share the ex-president of Mexico's opinion, and, well ... I don't. Unfortunately, I'm just a customer ... and I have purchased only a few HP devices. My scant whisper is as a tree falls in the forest with no one around, not to be melodramatic; no, not me...