HP-PRIME CAS SOLVING - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: HP-PRIME CAS SOLVING (/thread-253220.html) HP-PRIME CAS SOLVING - fabrice48 - 10-19-2013 I have an HP48 with it i solve some expression, but on HP-PRIME, i don't find how to do the same : example : i have the electrical : U=R*I i want to 'transform it' in CAS style, ON HP48 i do this : 'U=R*I' 'I' ISOL then the calculator answer : I=U/R How to do this on PRIME ???? Re: HP-PRIME CAS SOLVING - Helge Gabert - 10-19-2013 Try solve(u=r*ii, ii) gives [ii=(1/r)*u] I used the CAS do to this, and ii (because i is allocated (complex!)). Re: HP-PRIME CAS SOLVING - fabrice48 - 10-19-2013 it's very strange, i do the same as you but my machine answer this : {} have you an idea ? Re: HP-PRIME CAS SOLVING - fabrice48 - 10-19-2013 i know why : teh rule seems in CAS only lower cas character allowed. Re: HP-PRIME CAS SOLVING - Helge Gabert - 10-19-2013 Yes! Re: HP-PRIME CAS SOLVING - Helge Gabert - 10-19-2013 Now I have a question. I'm running the same command again, from the CAS history, and my output is in a different format, in curly brackets and without the equal sign and the variable to solve for. {(1/r)*u} I didn't change any flag settings (that I'm aware of). ???? Re: HP-PRIME CAS SOLVING - Han - 10-19-2013 Quote: i know why : teh rule seems in CAS only lower cas character allowed. The upper case single characters are actually built-in variables. Upper-case variables such as MYVAR is fine. Re: HP-PRIME CAS SOLVING - Han - 10-19-2013 Quote: Now I have a question. I'm running the same command again, from the CAS history, and my output is in a different format, in curly brackets and without the equal sign and the variable to solve for. {(1/r)*u} I didn't change any flag settings (that I'm aware of). ???? I believe this is normal behavior (the HP Prime does not do everything in the same way as older calculators) Re: HP-PRIME CAS SOLVING - Helge Gabert - 10-19-2013 Yes, but when I first ran the command solve(u=r*ii, ii)on the Prime (CAS view) I got this: [ii=(1/r)*u] Now I get this on the exact same machine, with the same command solve(u=r*ii, ii), again in CAS view: {(1/r)*u} Strange. What output format do you get?