IP() on negative number  issue

11282017, 09:58 PM
(This post was last modified: 11282017 09:59 PM by primer.)
Post: #1




IP() on negative number  issue
Hello,
I found there is an issue with IP() function (both in home and CAS). IP() stands for "Integer Part", ok... but the "integer part" function is defined in math in that way : It's the function that take a real number and return an integer n with n ≤ x < n+1. IP(1.5) returns 1 while the "integer part of 1.5" is 2 according to definition. so IP() is wrong on negative numbers. I know FLOOR() does the job, but it's a question of vocabulary. it's confusing for math users/students. IP() should return the same as FLOOR(). if you want a function that return 1 here you should use TRUNCATE(1.5 ,0), not IP(1.5) primer 

11282017, 10:12 PM
(This post was last modified: 11282017 10:16 PM by salvomic.)
Post: #2




RE: IP() on negative number  issue
hi,
see here in Wolfram Alpha for definition. IntegerPart[1.5] returns 1 (see here). Also in HP15C: Int(1.5) I get 1 In HP 50g: IP(1.5) > 1 also... Salvo ∫aL√0mic (IT9CLU), HP Prime, 50g, 41CX, 42s, 15C, 12C, DM42 :: Prime Soft. Lib 

11282017, 10:42 PM
Post: #3




RE: IP() on negative number  issue
(11282017 09:58 PM)primer Wrote: Hello, No, IP returns the integer part only. It just lops off any decimal. Think of it as CEIL instead of FLOOR. Tom L DM42 SN: 00025 (Beta) SN: 00221 (Production) 

11292017, 05:57 AM
Post: #4




RE: IP() on negative number  issue
Hello,
IP and FP are NOT math functions, they are programming functions. And they do work as intended, cuttting off what is on the right or left of the decimal point. FLOOR and CEIL are math functions and do respect the rule that you stated. This is why they are 3 (FP excluded) functions to deal with this and not two. Cheers, Cyrille Although I work for the HP calculator group, the views and opinions I post here are my own. I do not speak for HP. 

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