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Programming HP Prime
02062018 03:37 PM
Hello,
New HP Prime user. I need some help with a few things...
#1. How can i substitue symbolic equations. for example x=y+b, b= a+c subst b so that x=y+a+c?
#2. how can I program equations to be used to solve for vaerables symbolically?
#3. how can I program equations like x=y+z and the calclulator ask to the input of y and z then caculates x?
#4. how can I make the equations on my laptop then upoad them to my calculator?
#5. can I make equations with greek letters and subscripts?
I have spent a few hours researchiing but i am no finding much on my issues. this is a little urgent as I need to have a few equation in my calclator by tommorow evening. examples of how to do what I am trying to do will be vary helpful.
02062018 03:49 PM
You can see, from ...
http://www.hpmuseum.org/forum/thread216.html
http://h10032.www1.hp.com/ctg/Manual/c05332710
Have a nice day !.
@Maké (Technical Advisor Premium  HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
02062018 10:47 PM
Hello
First, looking at your questions, you are looking at CAS type functions (symbolic). So, make sure that you create a CAS program and use it from the CAS menu, it will help.
#1. How can i substitue symbolic equations. for example x=y+b, b= a+c subst b so that x=y+a+c?
Look at the so called "Where" command which is entered through the template key (C key). or through the  symbol on the keyboard.
x=y+bx=y+a+c
#2. how can I program equations to be used to solve for vaerables symbolically?
the solve command is probably what you are looking for here.
You could place your equations in the SOLVE function and then use the command line, CAS solve function to solve them symbolically.
#3. how can I program equations like x=y+z and the calclulator ask to the input of y and z then caculates x?
The easiest thing here would be to use the SOLVE app which will do this for you.
#4. how can I make the equations on my laptop then upoad them to my calculator?
yes you can. Use the HP connectivity kit available from the HP website (I am sorry, but I do not have the URL easely available at the moment).
#5. can I make equations with greek letters and subscripts?
This is a good question and I am not 100% sure.
The SOLVE app, being a home app will (by default at least) not let you do it.
I do not know for the CAS.
Cyrille
02072018 10:31 AM
With respect to issue #5:
Yes you can use greek letters, and many more, which are accessable via Shift Chars (A key).
In the menu that appears choose More'Greek and Coptic'.
Many greek letters are also available via Shift9
The easiest way to use subscripts is to use variables like a1,a2,a3,K1,K2,K3
You can also use indexed list elements.
Let us say you have a list: L1={3,5,6,9,3}, then you can use L1(1),L1(2),L1(3) and so on.
Variables like the greek letters or variables like a2, a3 you can use without problems in the CAS view, so press the CAS key.
However,they are not accepted simply in Home view (the key with the little house).
When you want to use them in Home view you first have to assign them a value, eg:
5 ►a1, or
a1:=5
You will be asked if you want to create a new variable. Press OK.
From now on you can use it in Home view, and also in the apps, like the Solve app.
02072018 10:47 AM  edited 02072018 02:41 PM
With respect to #1:
As Cyrille pointed out you can use the command which is called: 'where'
You can find it on the templates key, (C key), upper row, third position
Its Help is not so easily available.
You can get it by pressing Toolbox (B key) , in the menu choose Catlg, next press the Z key, you are now nearly at the bottom of the list of commands.
Go a few positions more downwards and you see a vertical bar, which is the where command.
Hold it a few moments with your finger and press Help, to get its Help.
Another possibility is the 'subst' command. Select it via Toolbox  Catlg and press Help.
02072018 10:59 AM
With respect to #2:
This would be an example:
a
Because it are symbolic calculations we have to do it in CAS, so press the CAS key.
We use the solve command, which can be found via Toolbox (key B)  CAS  Solve.
By selecting it and pressing Help you get its Help.

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