Possible bug with sqrt function in the HP prime  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Possible bug with sqrt function in the HP prime (/thread255833.html) 
Possible bug with sqrt function in the HP prime  Michael de Estrada  11152013 I say "possible" bug in the title, because this may just be another case of me not understanding the subtleties of this calculator. I have found that if I pass a dummy variable x to a program and use it with sqrt(x), then I get a program halt with Error: wrong argument type. However, if I express it as v X, v(x), x^.5 or (x)^.5, where v is the square root symbol, then it works fine. I have no problems using other builtin functions such as SIN(x). I do not declare the variable as LOCAL in the program, as this causes it to evaluate to zero, regardless of the value passed to the program. EXPORT Test(x) BEGIN X:=sqrt(x); //this fails with wrong argument type X:=v x; //this works fine X:=x^.5; //this also works fine X:=SIN(x); //this also works fine RETURN x,X; END;
Edited: 15 Nov 2013, 11:59 a.m. after one or more responses were posted
Re: Possible bug with sqrt function in the HP prime  Tim Wessman  11152013 Square root symbol? Or the word spelled out "sqrt"?
Re: Possible bug with sqrt function in the HP prime  Michael de Estrada  11152013 The square root symbol as inserted by the shift x^2 key and the expression sqrt() as inserted from the catalog.
Re: Possible bug with sqrt function in the HP prime  Tim Wessman  11152013 Ah. You are storing into real variable X. If you just return your sqrt(x), what do you see? (sqrt is a CAS command btw)
TW Edited: 15 Nov 2013, 12:03 p.m.
Re: Possible bug with sqrt function in the HP prime  Michael de Estrada  11152013 Yeah, it works now. I guess I should have realized that it was a CAS command, since it is lower case letters. I also see that X:=CAS.sqrt(x) works or CAS("X:=sqrt(x)")
Edited: 15 Nov 2013, 12:30 p.m.
Re: Possible bug with sqrt function in the HP prime  Tim Wessman  11152013 As would EVAL(sqrt(x)) I suspect. The issue is trying to store a symbolic into a real only variable.
TW
Re: Possible bug with sqrt function in the HP prime  Michael de Estrada  11152013 What I find very confusing is that if I'm in CAS and select and enter sqrt from the catalog it displays as sqrt() on the command line, but once I enter it as sqrt(x), it becomes v x. If I do the same with sqrt(X) in Home it becomes sqrt(X) on the input side of the history. Edited: 15 Nov 2013, 12:49 p.m.
