From: Bastian Erdnuess on 30 Nov 2009 14:15 Hi, On the HP 28S is a command called FORM. Does anybody here knows it? It is used to reformat expressions. E.g. with it you can pretty easy transform 'X+Y' into 'Y+X'. I now have had a hard time trying to transform '1/(SQRT(2*pi)*EXP(X^2/2))' into '1/SQRT(2*pi)*EXP(X^2/2)' on the HP 50g, but no chance. Does anybody know how to do this? I found the equation writer (EQW) and the algebra menu (ALG) containing beside others COLLECT and EXPAND. I also went over the fifth chapter of HP 50g's user guide ("Algebraic and arithmetic operations") but I didn't find anything useful in there. Thanks for any hint, Bastian PS: There is no point doing THIS transformation. I just want to know, how to do transformations like that in general.
From: ddoherty03 on 2 Dec 2009 20:52 On Nov 30, 1:15 pm, earth...(a)web.de (Bastian Erdnuess) wrote: > Hi, > > On the HP 28S is a command called FORM. Does anybody here knows it? It > is used to reformat expressions. E.g. with it you can pretty easy > transform 'X+Y' into 'Y+X'. I now have had a hard time trying to > transform '1/(SQRT(2*pi)*EXP(X^2/2))' into '1/SQRT(2*pi)*EXP(X^2/2)' on > the HP 50g, but no chance. Does anybody know how to do this? > > I found the equation writer (EQW) and the algebra menu (ALG) containing > beside others COLLECT and EXPAND. I also went over the fifth chapter of > HP 50g's user guide ("Algebraic and arithmetic operations") but I didn't > find anything useful in there. > I'm not sure what you mean by you "found the equation writer". You can use it pretty easily to do this sort of thing by selecting the (X^2/2) subexpresion with the arrow keys, then hitting the '+' key. If you mean doing programaticly, I don't know. Regards, Dan
From: Bastian Erdnuess on 3 Dec 2009 02:03 Thank you, for your respond. ddoherty03 <ddoherty03(a)gmail.com> wrote: > On Nov 30, 1:15 pm, earth...(a)web.de (Bastian Erdnuess) wrote: > > Hi, > > > > On the HP 28S is a command called FORM. Does anybody here knows it? It > > is used to reformat expressions. E.g. with it you can pretty easy > > transform 'X+Y' into 'Y+X'. I now have had a hard time trying to > > transform '1/(SQRT(2*pi)*EXP(X^2/2))' into '1/SQRT(2*pi)*EXP(X^2/2)' on > > the HP 50g, but no chance. Does anybody know how to do this? > > > > I found the equation writer (EQW) and the algebra menu (ALG) containing > > beside others COLLECT and EXPAND. I also went over the fifth chapter of > > HP 50g's user guide ("Algebraic and arithmetic operations") but I didn't > > find anything useful in there. > > > > I'm not sure what you mean by you "found the equation writer". I'm not sure, either. I think it shell mean something like "I'm aware that it exists, but I don't see how to use it to do what I want". > You can use > it pretty easily to do this sort of thing by selecting the (X^2/2) > subexpresion with the arrow keys, then hitting the '+' key. But this changes the expression. How it is, is that in '1/(SQRT(2*pi)*EXP(X^2/2))' the EXP is in the denominator. But what I want is, to have the EXP in the nominator, just with opposite sign. When I do what you explain then the EXP is still in the denominator, but with opposite sign. That's not what I want. > If you mean doing programaticly, I don't know. No, just by hand. Regards, Bastian

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