|Reminders/notes to help recall variable meanings in equations|
Message #1 Posted by Chris C on 14 Feb 2012, 8:37 p.m.
Several equations I want to store in my 35s contain, when written in books, variables using the same letter with different subscripts. (See the 3rd post here for an example of what I mean: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi?read=211648#211648 ) Of course the 35s doesn't support subscripts so a letter can only be used once when storing an equation. This means other (non-meaningful) letters must be used in the stored version of the equation. I can see this being a problem after not using one for a while (I'll forget what values go where in the equation.)
I do know that setting flag 10 in a program allows prompting for variables using strings of descriptive characters. This works very well when using the equation as it is programmed, and would seem to avoid the problem described above. However, when a variable within an equation is needed to be solved for, SOLVE won't work for equations in programs unless the program uses the INPUT command to receive variables - and the INPUT command prompts for variable entry using single letters only.
So, despite the usefulness of flag 10, programs that don't use INPUT can't be used when I'll need to solve for different variables within equations. When this ability is necessary I'll have to use the equation list, and the original problem in the first paragraph comes back.
Is there a solution to this dilemma (other than writing a program for every way an equation can be solved) ?
Or if not, is there an intuitive way to save notes somewhere to help remind me which letters represent which variables for equations in the equation list?
Edit: I'm using this calculator because it's the best option on NCEES's approved calc list, so switching to another calculator isn't an option.
Edited: 14 Feb 2012, 9:44 p.m. after one or more responses were posted