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+--- Thread: Miscellaneous Bugs and Problems (/thread-7304.html)
Miscellaneous Bugs and Problems - CH3791 - 11-25-2016 05:10 AM
1a. Plotting the derivative of a function in the function app.
[attachment=4193]
1b. Plotting a graph with a domain.
[attachment=4196]
For these two cases, most of the functions would not work correctly. The ones with problems I have found include: 6 Slope, 7 Signed Area, 8 Extremum, 9 Tangent
[attachment=4194][attachment=4197]
2. The Define menu.
In order to make a user variable, one must use the Define Menu (shift + xtθn). The Name must be lower case and Function must be upper case. However, when you tap alpha when typing a function, it is not automatically in CAPS mode and the letters come out as lower case. This is kind of annoying as other places eg. HOME and CAS have the cases optimised correctly.
[attachment=4195]
3. Prime messing too much with inputs.
Whenever you click on items that sit on the command line, the Prime automatically adds in a whole lot of stuff such as extra brackets and spaces. These cosmetic changes are annoying and it would still be great to have a setting to turn this off.
However, sometimes during this alteration process, the input actually turns incorrect. Two examples are listed below.
diff((x-4)*(x+9))
will become
(x-4)*(x+9)' with only the second bracket is being differentiated.
x^-1
will become
x(^-1)
The ^-1 has been converted into one unit, and it is impossible to edit the exponent itself anymore.
RE: Miscellaneous Bugs and Problems - DrD - 11-25-2016 10:49 AM
Which software version are you using?
RE: Miscellaneous Bugs and Problems - CH3791 - 11-25-2016 11:01 AM
Version 10637, so should be the latest one?
RE: Miscellaneous Bugs and Problems - CH3791 - 11-25-2016 11:11 AM
Ok it seems that for graphing with a domain, using a piecewise defined function solves the problems with 6 Slope, 7 Signed Area, 8 Extremum and 9 Tangent functions.
RE: Miscellaneous Bugs and Problems - jte - 11-25-2016 10:46 PM
(11-25-2016 05:10 AM)CH3791 Wrote: 1a. Plotting the derivative of a function in the function app.
...
For these two cases, most of the functions would not work correctly. The ones with problems I have found include: 6 Slope, 7 Signed Area, 8 Extremum, 9 Tangent
The Slope, Extremum, and Tangent features of the Function Plot view ask lower levels of the system to differentiate the function of interest. There are a variety of conversion issues involved.
If you go to the CAS screen and try entering
diff(F2(X),X)
with F1 and F2 defined as you've suggested (F1(X)= X^3+3*X^2 and F2(X)= ∂(F1(X),X=X)), you'll see this (conversion) issue at a command-line level.
Similarly, an evaluation of
∫(F2(X),X,0,1)
in the CAS screen will show this type of conversion issue at a command-line level for integration (which the Signed Area feature of the Function app relies on).
RE: Miscellaneous Bugs and Problems - jte - 11-25-2016 10:52 PM
(11-25-2016 11:11 AM)CH3791 Wrote: Ok it seems that for graphing with a domain, using a piecewise defined function solves the problems with 6 Slope, 7 Signed Area, 8 Extremum and 9 Tangent functions.
Yes, compare how differentiation (and integration) of F1(X) behaves in the CAS screen for F1(X)= X^2/(X>=-3 AND X<=3) vs F1(X)= PIECEWISE(X>=-3 AND X<=3,X^2).