08-01-2016, 11:04 AM
Hi,
Recently got an HP Prime and I love it, but there is one thing that drives me insane. It probably is just a lack of user knowledge but I cannot for the life of me figure out how to select/edit subexpressions in equations.
I have to admit I have always been a 'sloppy' equation writer so I don't necessarily think too much about parentheses and ordering beforehand. On the previous HPs (previously owned 28S, 48SX, 49G and 50G - still use that last one) this didn't matter as I could always select a subexpression and edit it further. On the Prime however I cannot figure out how to do this.
Example 1: I start writing x+1/y ... and then realise that I actually meant to write (x+1)/y, so have to go back add a () at the start, remove the ), add a () at the end, remove the (, etc. All a bit tedious. On the 50G this is easy, just press "up" key twice and then press "/" and all is good again.
Example 2: I have this expression: (1+x+a)/(1+x-a). I want to change it to (1+sqrt(x+a))/(1+sqrt(x-a)). I cannot figure out how to do this other than re-entering the equation from scratch. On the HP50G (&co) I could just select the subelements x+a and x-a and apply the sqrt to these components.
If anyone can tell me how to do this, I would be eternally grateful.
Regards
Recently got an HP Prime and I love it, but there is one thing that drives me insane. It probably is just a lack of user knowledge but I cannot for the life of me figure out how to select/edit subexpressions in equations.
I have to admit I have always been a 'sloppy' equation writer so I don't necessarily think too much about parentheses and ordering beforehand. On the previous HPs (previously owned 28S, 48SX, 49G and 50G - still use that last one) this didn't matter as I could always select a subexpression and edit it further. On the Prime however I cannot figure out how to do this.
Example 1: I start writing x+1/y ... and then realise that I actually meant to write (x+1)/y, so have to go back add a () at the start, remove the ), add a () at the end, remove the (, etc. All a bit tedious. On the 50G this is easy, just press "up" key twice and then press "/" and all is good again.
Example 2: I have this expression: (1+x+a)/(1+x-a). I want to change it to (1+sqrt(x+a))/(1+sqrt(x-a)). I cannot figure out how to do this other than re-entering the equation from scratch. On the HP50G (&co) I could just select the subelements x+a and x-a and apply the sqrt to these components.
If anyone can tell me how to do this, I would be eternally grateful.
Regards