CAS command question

01142017, 03:31 PM
(This post was last modified: 01142017 03:46 PM by compsystems.)
Post: #101




RE: CAS command question
Well let's continue to evaluate the CAS in separate threads
For example in this thread related to the parts of an inequality, report that the HPPRIME CAS does not perform operations with inequalities, such as simplify, other results are strange, and there was no response (x<13) AND (x>5); returns (13>x) AND (x>5) // ok the same above expression, but rewritten. 5<x<13; returns 0 ? (Inconsistency) (x<13) OR (x<5); returns (13>x) OR (5>x) // ok (x<13) XOR (x<5); returns 0? not(x<13); returns NOT(13>x) // Does not reverse inequality (2*x>4)/2; ⇨ (2*x > 4)/2; This must be the output ⇨ 2*x/2 > 4/2 ⇨ x < 2 collect( (x+13*x) > (3*x+53*x)); ⇨ (x+13*x) > (3*x+53*x) This must be the output ⇨ (x3*x)+1 > (3*x3*x)+5 ⇨ (2*x+1) > 5 

01142017, 07:27 PM
Post: #102




RE: CAS command question
(01142017 01:05 PM)compsystems Wrote: MY question is HOW TO IMPROVE THE CAS?, so that it works as the CAS of the TI68K / TINSPIRE and CLASSPAD. Giac will never be a clone of the TI or Casio CAS. It will continue to improve as long as I can improve it, but I will not waste time in large redesign of Giac. My main priorities are speed efficiency and mathematical functionalities. Double inequation like in 5<x<13 are not supported by the Prime CAS parser. I will probably add evaluation of not(x<5) to x>=5. (2*x>4)/2 already returns (2)>(2*x/2) in the current version of Xcas. 

01152017, 01:28 AM
Post: #103




RE: CAS command question
Dear Bernard. For my xCAS has a great value, because it is created by a single author, while other CASs have several developers.
I never want to clone another calculator, what should be cloned are the mathematical functionalities as EXCHANGE: reverses the direction of inequality REWRITE: Takes the expression on the right side, to the left. ABSEXPAND, COMBINE, etc 

01152017, 09:30 AM
Post: #104




RE: CAS command question
(01142017 03:27 PM)Dirk.nl Wrote: Another positieve contribution, I hope. Contraposition: 1. The left side of the road is the right side when the viewport contains an odd number of mirrors. 2. Multivariate objective functions, subject to many constraints, don't always converge on an optimality. Your conclusion isn't defensible. Left is simply, not right. 3. Strictly speaking, if you evaluate your situation, thinking left is right, when left is wrong, and the forces interact, the outcome isn't guaranteed. If you are "civil," the passing may be congenial. Summary: Extending your conclusion in example 2, to modern combatants, past horses and rocket powered antimissile missile systems, to laser lances, any delay time imposed by requiring an extra handling process to get true left or right guidance, may be at a cost: erreur fatale. May I suggest that modeling these problems may be better suited in a new thread? I started this bug report, and feel that Parisse has very adequately dealt with the issue. Agreement has been reached, for this CAS, it's simply not worth further pursuit. 73's, QRT, AR, SK 

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