Evaluation symbol... - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: Evaluation symbol... (/thread-4361.html) Evaluation symbol... - salvomic - 07-14-2015 08:24 PM hi, please, help to get evaluation symbol (|) in a program... I would get this: Code: ``` EXPORT lagrangeValue(lista_x, lista_y, xValue) BEGIN   LOCAL y, temp;   y:= lagrange(lista_x, lista_y) | X=xValue;   RETURN y; END;``` but the | symbol isn't evaluated... What's the correct syntax? thank you, Salvo RE: Evaluation symbol... - Arno K - 07-14-2015 09:57 PM you perhaps should use: y:=unapply(lagrange(lstA,lstB),x), and then y(xVal), this at least works for the command line from cas, from home that is another question, the output then given by y:=unapply(lagrange(listA,listB),X) is some kind of weird: program(X,[0],X+1) and y(6) delivers Error: Invalid input, but in a cas program the solution above should work. I know, this is not what you want to do, but with the prime one often has to use, well, let me call it, workarounds to get something done. I would say ist a bug in the where function, as in simple instructions like x+1|x=6 it works correctly in cas (lower case x) and home (upper case x). Arno RE: Evaluation symbol... - salvomic - 07-14-2015 10:06 PM (07-14-2015 09:57 PM)Arno K Wrote:  you perhaps should use: y:=unapply(lagrange(lstA,lstB),x), and then y(xVal), this at least works for the command line from cas, from home that is another question, the output then given by y:=unapply(lagrange(listA,listB),X) is some kind of weird: program(X,[0],X+1) and y(6) delivers Error: Invalid input, but in a cas program the solution above should work. I know, this is not what you want to do, but with the prime one often has to use, well, let me call it, workarounds to get something done. I would say ist a bug in the where function, as in simple instructions like x+1|x=6 it works correctly in cas (lower case x) and home (upper case x). Arno hi Arno, thanks for input. I'm trying, but very weird results, yes! I put y:= unapply(lagrange(lista_x, lista_y), xValue); // xValue is 30 now I get also "program(30,[0],5.12234233945E-5": I should get only about 0.5 Is that as you told me? Salvo RE: Evaluation symbol... - salvomic - 07-14-2015 10:32 PM ok, the best way could be this: Code: ``` EXPORT lagrangeValue(lista_x, lista_y, xValue) BEGIN   LOCAL y, temp;   // y:= unapply(lagrange(lista_x, lista_y), X);   temp:= lagrange(lista_x, lista_y);   y:= EVAL(EXPR(temp+"|X="+xValue));   RETURN y; END;``` my input is: lagrangeValue({29.43,30.97,27.69,28.11,31.58,33.05},{0.4913598528,0.5145891926, 0.4646875083, 0.4711658342, 0.5236885653, 0.5453707057}, 30) (list of value about 30, list of sines, xValue to get=30) I get 0.500000000018 instead of 0.5, but it's almost ok. Salvo RE: Evaluation symbol... - Arno K - 07-15-2015 07:12 AM So I had given up too early when I tried to use "|" at some Point. But eval(expr(..))is a godd idea. I finally decided only to write programs using cas until (if ever) things will be fixed. Arno RE: Evaluation symbol... - salvomic - 07-15-2015 07:33 AM (07-15-2015 07:12 AM)Arno K Wrote:  So I had given up too early when I tried to use "|" at some Point. But eval(expr(..))is a godd idea. I finally decided only to write programs using cas until (if ever) things will be fixed. Arno I use also CAS programs mostly for analysis and algebra facts but in many cases (like the astronomy program) I write Home program, to be usable both in CAS and in Home... If this is possible, and sometime, with | or solve or ... is a great endeavor, hi. Salvo