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 ▼ fabrice48 Unregistered Posts: 33 Threads: 6 Joined: Oct 2013 10-19-2013, 11:55 AM 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 ???? ▼ Helge Gabert Unregistered Posts: 113 Threads: 20 Joined: Sep 2013 10-19-2013, 12:13 PM 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!)). ▼ fabrice48 Unregistered Posts: 33 Threads: 6 Joined: Oct 2013 10-19-2013, 12:19 PM it's very strange, i do the same as you but my machine answer this : {} have you an idea ? ▼ fabrice48 Unregistered Posts: 33 Threads: 6 Joined: Oct 2013 10-19-2013, 12:22 PM i know why : teh rule seems in CAS only lower cas character allowed. ▼ Helge Gabert Unregistered Posts: 113 Threads: 20 Joined: Sep 2013 10-19-2013, 12:26 PM Yes! ▼ Helge Gabert Unregistered Posts: 113 Threads: 20 Joined: Sep 2013 10-19-2013, 12:38 PM 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). ???? ▼ Han Unregistered Posts: 709 Threads: 104 Joined: Nov 2005 10-19-2013, 01:22 PM 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) ▼ Helge Gabert Unregistered Posts: 113 Threads: 20 Joined: Sep 2013 10-19-2013, 01:35 PM 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? Han Unregistered Posts: 709 Threads: 104 Joined: Nov 2005 10-19-2013, 01:21 PM 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.

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