Extremum Graphical Fails

03122021, 03:22 AM
Post: #1




Extremum Graphical Fails
I notice that the Prime comes up with a “No minimum or maximum found” on a number of functions in the graph app.
An example is the graph of d/dx (COS (X)/(1+(SIN(x))^2). I’m wondering why this is the case... 

03122021, 11:43 PM
(This post was last modified: 03132021 12:28 PM by essen.)
Post: #2




RE: Extremum Graphical Fails
(03122021 03:22 AM)lrdheat Wrote: I notice that the Prime comes up with a “No minimum or maximum found” on a number of functions in the graph app. Set angle mode to radians. Then it will, at least something of it. Should be: Y=1 for X=0+2*pi*n (n=integer, plus or minus). Y=1 for X=pi+2*pi*n (n=integer, plus or minus).  ? Not the only error. It' s not possible to correct errors on this calculator. As it were build with a mistaken coding language paradigm. Its memory separation has confused the creators themself. It was also a serious mistake not to use aprostrophized variables, instead of stringing. All but a few command function does not work if variables are apostrophized. The stringing gives unsolvable problems with purging and storing and handling lists holding variables not stringed, as these variables will evaluate at any action on them. Stringing them as required in this abnormal language, are not compatible with what stringing are for in programming. Nobody of the people who keeps favoring this calculator has ever made any serious programming running on it. Otherwise they would had known. Manufacturers of such defective pieces should be proceeded against, when not being honest about it, trying to hide it. 

03132021, 10:09 PM
Post: #3




RE: Extremum Graphical Fails
Perhaps the graphing app does not analyze extremums for some d/dx functions. When I took d/dx symbolically of the function that failed, and entered that into the graphing app, it found the extremums.


03142021, 08:12 AM
Post: #4




RE: Extremum Graphical Fails
Hello, I tried these steps:
I entered in F1 (X) d(Cos(x)/(1+Sin(x)^2))/dx: I requested the calculation of the extreme and I obtained: "No minimum or maximum found". I entered the explicit derivative on F2(X): I requested the calculation of the extreme: the calculator has calculated it. I again requested the calculation of the extreme of the function F1(X): this time the calculator has calculated it. Strange, right? 

04152021, 06:01 PM
Post: #5




RE: Extremum Graphical Fails
My example (post 1) works now with new beta update!


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