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HP Prime  Math Templates Usage Question
05282015 08:11 AM
On the HP Prime, if I press the math template key, I see a group of templates pop up on the screen. These templates do not apprear in help nor are they identified in the User's manual. I know what most of them are for, but a few I do not. And the one I am particularly interested in is the third one over from the left on the top row. It is a box followed by a verticcal bar followed by a smaller box below the level of the bigger box. It believe this tempate is for evaluating functions at a certain value. However, I am getting syntax errors when trying to use it. I would very much appreciate detailed information on how to use this template, especially in using for a range of values. Ex. 0 < x < 4.
Thank you!
Todd
Solved! Go to Solution.
05282015 05:02 PM  edited 05282015 05:28 PM
The {} make a list for x in the equation to be evaluated. This screen cap is from CAS. If you want to do this in home, use capital X instead.
BTW, a box in a template with a filled square in it is required and an empty box is optional.
Hope the examples help.
06182015 03:56 PM
That same template does not work in Function Symbolic View for plotting. For example, entering F1(X)=X^2X>0, shows F1(X):NaN error in plot view. A workaround is to use F1(X)=X^2 (X>0). In other words, don't use the template. Use parentheses for the limits. Any ideas how to use the template in plot view or is this a bug?
06182015 06:22 PM  edited 06182015 06:51 PM
Use the piecewise template. It's the 5th one on the top row  the one with the "{if"
In Function, it'll accept 1<X<1, but in Adv Graph you'll need to do 1<X AND X<1
If you want the graph to be undefined outside those bounds, enter 0/0 on the second line with no condition following the "if".
Multiplying by (X<0), TIstyle, causes 0 to be a Y solution when tracing the graph ... and that's not right. 😉
(BTW, you could also divide by your condition, (X^2)/(X>0), to create the undefined/inf condition when false(0) is the evaluation, but I would strongly recommend the piecewise template so that there is no risk of multiplying/dividing by something other than 0 or 1 and unintentionally altering the plot)
07042015 04:18 AM
This is very useful. In my experimentation I had tried using parentheses, but it looked like the calculator was just going to multiply x^2 by what was in the parentheses. As you suggest, I entered in at the F1(X)= x^2(x>1 AND x<3) and it plots it perfectly.
Thanks for the great tip!
07042015 01:00 PM
Hi!, Jiangshi:
Please, see ... http://nctm.confex.com/nctm/2014AM/webprogram/Handout/Session22826/305MarkHowellCoolMathFromCoolGrap...
Have a nice day !.
@Maké (Technical Advisor Premium  HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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