|Re: HP Prime and Strings|
Message #6 Posted by Han on 20 Sept 2013, 10:11 a.m.,
in response to message #5 by Namir
Thank you for sharing your example, Namir. What I was looking for in particular, however, was an example on how to use INPUT in order to get a function. My goal is to create an interactive app, as opposed to a function like yours in which everything is entered at once. My attempt below results in an input-form-like interface (much like the HP48 series) but the default value is 0, and not a formula.
INPUT(F,"Graph 3D","f(x,y)=","Enter the function to graph","1/390*(X^3*Y-X*Y^3");
If I do enter a new formula "X*Y" or 'X*Y' -- with the quotes -- I get a syntax error. If I take out the quotes, then (as expected), the value of F is whatever X*Y is equal to the moment the program was run. However, this is not what I want, since I cannot evaluate F at different values of X and Y later within my program.
Secondly, if such a procedure should work, then presumably F is a string. How would I then convert a string object into a function?
Edited: 20 Sept 2013, 10:16 a.m.