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+--- Thread: CASE and PIECEWISE in CAS programs (/thread-1864.html)
CASE and PIECEWISE in CAS programs - Alberto Candel - 07-21-2014 10:45 PM
Hi,
I wrote a CAS program that contains the CASE command, like this
Code:
(x)->BEGIN
LOCAL k,s:=0;
CASES
IF x=0 THEN RETURN(s) END;
IF x=1 THEN RETURN(s+1) END;
DEFAULT
FOR k FROM 2 TO x DO
s:=s+1/(k^2-k);
END;
END;
RETURN(s);
END;The "Check" soft-key returns No errors in the program. So I exit the program editor and confirm that the program works OK. When I return to this program for further editing, I find that the Prime has rewritten it like so:
Code:
(x)->BEGIN
LOCAL k,s;
s:=0;
piecewise([x=0, RETURN(s), x=1, RETURN(s+1), FOR k FROM 2 TO x DO s:=s+1/(k^2-k); END;]);
RETURN(s);
END;So the CASE has been changed to piecewise. The program also runs OK, but no the "Check" soft-key returns
Error:Syntax Error and upon exiting the program editor (Shift+Programs), the Prime displays Syntax error in program line 3
I wonder if anyone knows what is going on. Thank you.
RE: CASE and PIECEWISE in CAS programs - parisse - 07-22-2014 09:50 AM
There is an extra ; after END before ] in piecewise (and [] should not be there).
I'm going to fix piecewise printing on the Prime.
RE: CASE and PIECEWISE in CAS programs - Alberto Candel - 07-22-2014 03:13 PM
(07-22-2014 09:50 AM)parisse Wrote: There is an extra ; after END before ] in piecewise (and [] should not be there).
I'm going to fix piecewise printing on the Prime.
yes, removing the extra ; after END shows no errors. But the prime will put the ; back, and it will move the closing parenthesis from the two RETURN() to the end. This renders the program unusable, as there is no way to correct it; it has to be rewritten with CASE.
RE: CASE and PIECEWISE in CAS programs - parisse - 07-22-2014 04:13 PM
If you edit your CAS program in the programming editor, it will be stored as is (not parsed and re-printed), and you can modify it without any problem.
RE: CASE and PIECEWISE in CAS programs - Alberto Candel - 07-22-2014 09:23 PM
(07-22-2014 04:13 PM)parisse Wrote: If you edit your CAS program in the programming editor, it will be stored as is (not parsed and re-printed), and you can modify it without any problem.
I am pretty sure I was doing Shift+Program, then select, then Edit. I also had the Algebraic entry in the Home settings (it appears that piecewise behaves differently with Textbook entry).