How to use RPN mode with Functions?

03032017, 12:05 AM
Post: #1




How to use RPN mode with Functions?
Hello  I bought a Prime ages ago but only recently tried to use it. My 15C had been quite sufficient thus far.
Anyway I entered a function definition and then tried to resolve it at the Home screen using Textbook entry, and it was fine. But when I switch to RPN mode I get a syntax error. E.g., if I define F1 = X^2 (for example) Textbook mode, I press Vars and then find the symbolic F1 entry, it shows F1 on the Home screen. Then I press the () key and then enter, say, 5. Then ENTER, and it would resolve to F(5) which is 25. But RPN mode doesn't work. Gets error. 

03032017, 12:16 AM
Post: #2




RE: How to use RPN mode with Functions?
In RPN entry, you need to place the argument(s) onto the stack. Then you would execute a command using COMMAND(n) where n is the number of arguments used by COMMAND. In this case, your command is F1. In algebraic notation, you would enter F1(5) to get 25. In RPN notation, you would place 5 onto the stack, and type F1(1).
Graph 3D  QPI  SolveSys 

03032017, 12:37 AM
Post: #3




RE: How to use RPN mode with Functions?
(03032017 12:16 AM)Han Wrote: In RPN entry, you need to place the argument(s) onto the stack. Then you would execute a command using COMMAND(n) where n is the number of arguments used by COMMAND. In this case, your command is F1. In algebraic notation, you would enter F1(5) to get 25. In RPN notation, you would place 5 onto the stack, and type F1(1). Ok thanks. So if I define a function with X and Y, then I would enter Y and then X onto the stack, and then type F1(2) to tell it to use the last 2 entered parameters on the stack? 

03032017, 12:52 AM
Post: #4




RE: How to use RPN mode with Functions?
(03032017 12:37 AM)lemontea Wrote:(03032017 12:16 AM)Han Wrote: In RPN entry, you need to place the argument(s) onto the stack. Then you would execute a command using COMMAND(n) where n is the number of arguments used by COMMAND. In this case, your command is F1. In algebraic notation, you would enter F1(5) to get 25. In RPN notation, you would place 5 onto the stack, and type F1(1). Yes, for a general 2variable function. Usually, F1 is intended for a singlevariable function. Graph 3D  QPI  SolveSys 

03032017, 01:08 AM
Post: #5




RE: How to use RPN mode with Functions?
(03032017 12:52 AM)Han Wrote:(03032017 12:37 AM)lemontea Wrote: Ok thanks. Thanks. But I am thinking maybe I should just use Textbook mode... sad to see RPN go.... 

03032017, 02:20 AM
Post: #6




RE: How to use RPN mode with Functions?
Note that specifying argument count only needs to be done when you have a variable number of arguments.
TW Although I work for the HP calculator group, the views and opinions I post here are my own. 

03032017, 02:53 AM
Post: #7




RE: How to use RPN mode with Functions?  
03032017, 03:05 AM
(This post was last modified: 03032017 03:09 AM by Tim Wessman.)
Post: #8




RE: How to use RPN mode with Functions?
(03032017 02:53 AM)lemontea Wrote: I tried not specifying anything and it didn't work. F1 can take a variable number of arguments. Use the define key, define a named function, and it wouldn't require it. Nor would something like CEIL, SIN, or similar. TW Although I work for the HP calculator group, the views and opinions I post here are my own. 

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