Question
Top Student
Posts: 6
Member Since: ‎11-18-2013
Message 1 of 12 (2,477 Views)

# HP Prime Sto

I can't seem to do a simple task with the HP Prime. I just want to store a number in a variable while in RPN mode. How do I do it?

# Re: HP Prime Sto

Hi,

Enter the number onto the stack. Type 'A', remember to use the ' ' (SHIFT on the ( ) button) then SHIFT STO (on the EEX button).

HTH

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PhD Student
Posts: 871
Member Since: ‎08-10-2010
Message 2 of 12 (2,462 Views)

## Re: HP Prime Sto

Hi,

Enter the number onto the stack. Type 'A', remember to use the ' ' (SHIFT on the ( ) button) then SHIFT STO (on the EEX button).

HTH

-Bart
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calculator enthusiast
Top Student
Posts: 6
Member Since: ‎11-18-2013
Message 3 of 12 (2,450 Views)

## Re: HP Prime Sto

Thanks. I knew it was simple, but couldn't find where it said to use the ' '.
PhD Student
Posts: 871
Member Since: ‎08-10-2010
Message 4 of 12 (2,444 Views)

## Re: HP Prime Sto

I'm not sure it's made clear in the manual. Also on the Prime in RPN mode, any algebraic expression (e.g. a function in an app) needs to be entered with the ' ' .

By the way, there is a manual available that may be newer than that shipped with the Prime:

http://h30499.www3.hp.com/hpeb/attachments/hpeb/bsc-408/13750/1/HP_Prime_User_Guide_EN.pdf

(all are edition 1, but the date on p3 is different)

The 50g often automatically puts the ' ' in. The Prime needs it explicitly put in when using RPN.

From this we can see that the 50G is an RPN calculator with Algebraic Mode added on. The Prime is an algebraic calculator with RPN added on.

By the way, a caution, the Spreadsheet App is not stable when using RPN mode.

Happy calculating.

-Bart
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calculator enthusiast
Honor Student
Posts: 2
Member Since: ‎12-06-2013
Message 5 of 12 (2,347 Views)

## Re: HP Prime Sto

I am in RPN mode:

why can i not store 25 gal/min into a variable?????

why can i not create the following formula in the solve app?

PRESSURE * FLOW = POWER

and enter units for each of the above variables to have the calculator solve for power and show the result in horsepower?

Honor Student
Posts: 2
Member Since: ‎12-06-2013
Message 6 of 12 (2,345 Views)

## Re: HP Prime Sto

I am in RPN mode:

why can I not store 25 gal/min into a variable named FLOW???

why can I not create the following formula in the solve app?

PRESSURE * FLOW = POWER

and enter units for each of the above variables to have the calculator solve for power and show the result in horsepower?

i am totally fustrated!!! this should be basic stuff for the HP Prime Calculator

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PhD Student
Posts: 871
Member Since: ‎08-10-2010
Message 7 of 12 (2,334 Views)

## Re: HP Prime Sto

[ Edited ]

Hi

-Bart
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calculator enthusiast
Honor Student
Posts: 3
Member Since: ‎03-15-2014
Message 8 of 12 (2,123 Views)

## Re: HP Prime Sto

Does anyone know how to change the base number when using logarithms
Honor Student
Posts: 3
Member Since: ‎03-15-2014
Message 9 of 12 (2,115 Views)

## Re: HP Prime Sto

I can do log 10, but how do you change the base unit to say somthing like log3
Posts: 366
Member Since: ‎02-04-2014
Message 10 of 12 (2,086 Views)

## Re: HP Prime Sto

[ Edited ]

The easiest way to find the log of X base Y is LOG(X,Y).  Example: LOG(81,3) returns 4, because the log of 81 (base 3) is 4.  In Home, this is the easiest way because LOG and comma are primary keys.

Hint: in Home, press the Help key, then tap the Keys button, then press the LOG key.  Cool, huh?

You can also use the logb command, which looks nicer in Textbook Display mode.  It's the second-to-last item on the template key (next to the Toolbox key).

Caution: In CAS, LOG(x,y) must be spelled in uppercase, and logb(x,y) must be spelled in lowercase.  In Home, it doesn't matter.

Hope that helps!

-Joe-
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