Wednesday, April 1, 2015

HP Prime: Equation Library

The program eqnlib offers 47 equations for HP Prime’s Solver App.  Just run the eqlib program, select the category that you are interested in, and select the equation within that category and you are off and running!

Categories include:
* Geometry  (areas, volumes, surface areas)
* Finance  (monthly loans, sales tax, break-even)
* Temperature Conversion (Fahrenheit to and from Celsius)
* Physics: Problems of Motion  (linear distance, circular motion, pendulums, terminal & escape velocity)
* Sound  (speed of sound, Doppler effect, loudness)
* Optics (Lens and Snell equations, spherical refraction)
* Electronics (2 resistors series and parallel, thermal noise, Ohm's Law)
* Astronomy (parallax, luminosity, Kepler's 3rd Law, time dilation)
* Great Circle Calculations 
* Angle of Incidence Calculations
* Gases (Ideal and Boyle's Gas Laws, heat capacity, air density, isothermal expansion)
* Fluids (depth pressure, fluid flow, Bernoulli's Equation)

When calling each equation, a screen will show each of the variables used, and if necessary, what units you will need to use.  While SI (meters, kilograms, seconds) units are used, some equations call for the temperature to be in Celsius, while others require the temperature to be in Kelvin.    

You can download the hpprgm file and the PDF document here:

The PDF document will list the equations available and the variables used.  For eqlib, the global variables A-Z and theta are used.  The program is free.



P.S. This is not an April's Fool joke, just in case you were wondering.  

This blog is property of Edward Shore, 2015.  


  1. Muy buen trabajo!! Te felicito, saludos desde Argentina!!

  2. Good work, your program is very good and useful, you should upload a tutorial where you teach how to make these types of libraries, so that everyone can create their own libraries based on their specific needs, is my advice, very good program, Greetings

  3. Hi Eddie, receive a huge hug from Venezuela. I got a question here. I dont know exactly what to do to install and use your eqnlib. I opened the CK and put your file eqnlib.hpprgm into content folder and then I sent it to the PRIME. I appears in the "Programs" zone, but I cannot open nor use your program when i try in the calculator. I havent found yhe way to do it. I´ll appreciate your help. God bless you.

  4. hello eddie, nice work . By the way, can you add rhumb line calculation to have a good set of navigation routines? great circle+rhum line will be fantastic . And why not composite navigation also ?

  5. Thank you very much for the equation library. I got my 13-year-old a 48G and might now get her a Prime thanks to your excellent work.


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