Ans before minus problem [Beginner Alert] - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: Ans before minus problem [Beginner Alert] (/thread-14711.html) |
Ans before minus problem [Beginner Alert] - superludvig - 03-24-2020 09:19 AM Well, decided to buy the hp prime for school and now I've ended up in a problem. Every time I enter a negative number, especially irritating in statistics, "Ans" decides to pop up before the minus sign. Making go back a step to delete 3 letters every time I need to input a negative number. Is there an option to dissable the automatic "ans"? RE: Ans before minus problem [Beginner Alert] - Moggul - 03-24-2020 11:12 AM Seems you are using the subtraction operand (-) instead of the change sing key (+/-) RE: Ans before minus problem [Beginner Alert] - superludvig - 03-24-2020 06:36 PM Oh... I thought that button was for situations like: x= ±√4 => x=2 x= -2 RE: Ans before minus problem [Beginner Alert] - ijabbott - 03-24-2020 11:22 PM I suppose the '+/-' key would have been labelled '(-)' if it wasn't for the need to support RPN. RE: Ans before minus problem [Beginner Alert] - Steve Simpkin - 03-25-2020 02:33 AM (03-24-2020 11:22 PM)ijabbott Wrote: I suppose the '+/-' key would have been labelled '(-)' if it wasn't for the need to support RPN. Yes '(-)' is what most calculator manufacturers currently use for their sign change key. HP used 'CHS' (Change Sign) for many years. HP changed the key label to '+/-' in 1990 with the introduction of the HP-48SX and appear to have used that symbol on newer models ever since. TI used '+/-' for this key for many years until around 1990 when they switched to '(-)' with the introduction of the TI-81 graphing calculator and appear to have used that symbol on newer models ever since. Early Sharp and Casio models used '+/-' for this key until they also switched to '(-)'. RE: Ans before minus problem [Beginner Alert] - Wes Loewer - 03-25-2020 10:24 PM (03-25-2020 02:33 AM)Steve Simpkin Wrote: HP used 'CHS' (Change Sign) for many years. On the Friden 132 from the mid 60's, the key was labeled "CHANGE SIGN". RE: Ans before minus problem [Beginner Alert] - Steve Simpkin - 03-25-2020 10:55 PM (03-25-2020 10:24 PM)Wes Loewer Wrote:(03-25-2020 02:33 AM)Steve Simpkin Wrote: HP used 'CHS' (Change Sign) for many years. Interesting. On the first (HP9100A) and second (HP9810A) generation HP desktops they labeled it "CHG SIGN". https://www.hpmuseum.org/9100/9100akm.jpg https://www.hpmuseum.org/98xx/9810kbds.jpg On the third generation (HP9815A) HP desktop they changed it to a "+ -" symbol with a pair of curved arrows between them. https://www.hpmuseum.org/9805_15/9815keyl.jpg When they came out with the HP-35 hand held, they changed it to "CHS". "CHS" was then used on hand helds and desktop models until the HP-48SX. |