|HP Prime "Symb" interface (bug?)|
Message #1 Posted by Han on 12 Sept 2013, 2:38 p.m.
So in order to plot functions, the calculator requires one to first define an open sentence. I interpret open sentence as something like
p(n) : n^2+1 is prime
(from logic), but I am pretty sure that is not what is meant by open sentence.
At any rate, the first thing I tried was to just type X^2. Except this results in 0. Strange. I click on the help screen (nice feature). Then I see "Example" in the menu, click on it thinking this will show me how to properly set up an open sentence. And I select the example they give. You'd think that this example would work. Pressing ENTER then results in "Error: Syntax Error" (why the redundancy?)
I had a hunch (because I used previous HP calculators) that an algebraic object was needed. (How would someone completely new to HP calculators know this, though? I know there will be manuals, but the reality is that many folks will hardly ever refer to one.) Apparently we need tick marks around our "open sentences" except if I try pressing SHIFT and (), there is no way to get just a single tick mark. Back in the HP48 days, one could take an existing equation in the command line, move the cursor to the beginning, and add a single tick mark to designate an algebraic object. I believe that is what is required here, but I have yet to figure out how to get a single tick mark. There seems to be only the option of getting a pair of tick marks with a placeholder in between.
A typical student user will not bother with a manual, and when they do it will be likely out of reluctance. That statement is based on years of experience with college students. The help screen needs to be updated to mention the tick marks and the example should have already had the necessary delimeters. The help screen refers to S0 through S9 (presumably "[S]entences" 0 through 9) except the actual input screen shows V0 through V9.
I'm using Rev 5016 (2013 8 13) if that helps. (Is this the latest?)
My settings are to use RPN mode -- everything else was left to default.