Getting wrong result calculating EAR on HP Prime

03092014, 02:50 AM
Post: #1




Getting wrong result calculating EAR on HP Prime
Hi all,
I'm new to the forum and I ended up here after searching on Google for 2 hours how to troubleshoot an issue with my Prime. I'm trying to calculate an effective annual rate. I enter (1 + 0.1 / 12 ) ^ 12  1, and I get 0.1 (10%) as the result. This is inaccurate. The correct result is .1047130674 (approx 10.47%). I get this on both the Home and CAS modes. Has anyone ran into the same issue? Is this an issue with my configuration or a known issue with the calculator? I tried tweaking my settings for number format and simplification to no avail. I tried calling HP but they weren't able to help me. Any help will be very much appreciated. 

03092014, 04:33 AM
Post: #2




RE: Getting wrong result calculating EAR on HP Prime
Beats me . . . I get the correct result (number format standard).


03092014, 04:54 AM
(This post was last modified: 03092014 05:01 AM by letrekk.)
Post: #3




RE: Getting wrong result calculating EAR on HP Prime
I think I've found the root of the problem and a workaround. If I am on the Finance App and then I go to Home or CAS and type the equation, the result is 0.1. If I change the mode (by opening any other app) and then go to Home/CAS I get the correct result (.1047130674).
It is easy to reproduce the problem. I'm not sure if this is by design or a behaviour bug. Either way, the workaround is simple. 

03092014, 06:33 AM
(This post was last modified: 03092014 11:00 AM by Tugdual.)
Post: #4




RE: Getting wrong result calculating EAR on HP Prime
This is because finance isn't math, by default all numbers are rounded to 2 decimal places. Also number format is set with [Shift + Symb] by default Fixed 2 which is consistent with your observations. Set this to System and [Shift+Home] (Settings) becomes the one place to go for setting format.


03092014, 05:45 PM
Post: #5




RE: Getting wrong result calculating EAR on HP Prime
(03092014 06:33 AM)Tugdual Wrote: This is because finance isn't math, by default all numbers are rounded to 2 decimal places. Also number format is set with [Shift + Symb] by default Fixed 2 which is consistent with your observations. Set this to System and [Shift+Home] (Settings) becomes the one place to go for setting format. Thank you so much for the clarification, Tugdual. I've now updated my settings. 

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