CAS command question

[compsystems]

(01-06-2017 08:27 PM)Han Wrote:  You keep forgetting that the parser, like with almost any other CAS software, will generally evaluate its input. Evaluation of a quoted expression results in an unquoted expression. The net effect is essentially stripping the quotation. So copying the result would be copying an unquoted expression, which is why [up key][copy] gives you 3+4 on the command line, and not '3+4'. Try [up key] twice before copying..

I think it gives more power to the calculator if the expressions between ' ' are not evaluated (expression unchanged and un-evaluated.), for that there is the command EVAL, SIMPLIFY, COLLECT and others, if the expressions are maintained as they are, I could produce programs step by step much more easily, without make long codes and converting to strings

Why not do this in hp-prime? YOU or HP-TEAM AGREE?

case 1:
INPUT
EXPR
OUTPUT
EVAL(EXPR) // OK

case2:
INPUT
'EXPR'
OUTPUT
'EXPR' and not EVAL('EXPR')

or at least one system flag
EVALUATE EXPRESSION BETWEEN ' ' (ON CAS HISTORY) yes/no

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When defining a function where the expression is between ' ', in the history is displayed with quotes

F1(x):='sin(x)'; ⇨ 'sin(x)'
[up key] QUOTE(sin(X))
right(F1); ⇨ QUOTE(sin(X))
left(F1); ⇨ QUOTE(sin(X))

F1(90); ⇨ sin(90)