25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver

11082017, 12:24 AM
Post: #101




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
I'll see if I can dig up the exact system that caused issues  I was a system of 7 or 8 equations with a couple being linear and the rest quadratic. It was usually fine, but sometimes would chug along for a couple minutes and then return complex values for all of the variables. If I solved the equations in blocks, I'd get it to converge after having the complex result. It seemed overwhelmed with the whole system. The guess values were "realistic" given the physical expectation of the system.


02032018, 11:58 PM
Post: #102




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
Please, can you check if this app works fine with latest 13333 firmware version? Mine is no able to start solving. Thanks.


02062018, 07:27 PM
Post: #103




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
(02032018 11:58 PM)akmon Wrote: Please, can you check if this app works fine with latest 13333 firmware version? Mine is no able to start solving. Thanks. http://www.hpmuseum.org/forum/thread10067.html I will be publishing a newer version soon that has some feature updates and will also provide a workaround for this bug. Graph 3D  QPI  SolveSys 

02092018, 03:05 PM
Post: #104




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
(02062018 07:27 PM)Han Wrote:(02032018 11:58 PM)akmon Wrote: Please, can you check if this app works fine with latest 13333 firmware version? Mine is no able to start solving. Thanks. 

03212018, 10:15 PM
Post: #105




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
Hello everybody, I would like some help about an issue a friend has had.
She got her HP Prime a month ago and has recently added this Equation Library App to it in order to store and solve different systems of equations we need for our engineering classes. She has done everything as I told her to, since I've had it for a couple of months and have not had one problem with it. I have not seen any weird settings; the calculator has been updated and I reset it a couple of times. The problem is I add variables, define the equations I want to solve and when I hit the key NUM to give values to the different parameters, I get a message that says "No equations defined". Then, all the equations disappear as if they had never been typed in. The variables are still there but the equations aren't. I had never seen this kind of error, and I have worked with a lot of different classmates that have had problems with the HP Prime, all of them solved sooner or later. Also, programs do not execute correctly, there are no errors at all but it won't let us get to the input window. Any tips you can give me will be appreciated, we have no clue what's going on and I can't believe such an expensive calculator can give so many problems. Thank you very much! 

03222018, 04:22 AM
Post: #106




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
1) Which firmware do you have? (Press the Help key, then select the Tree menu option, and then choose About HP Prime from the listmenu.
2) What system of equations were you trying to solve. Graph 3D  QPI  SolveSys 

03312018, 12:15 PM
Post: #107




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
(03212018 10:15 PM)arturocb Wrote: Hello everybody, I would like some help about an issue a friend has had. I had faced with similar problem:I chose Digit Grouping: 123.456,789 , and it happened. It is solved when I chose 123,456.789 

04052018, 03:23 PM
Post: #108




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
I think I know what the problem is, now. My input forms are created dynamically, and I specifically use the "," symbol for separation when I should be using the userselected symbol for fraction mark.
Graph 3D  QPI  SolveSys 

09282018, 10:48 AM
Post: #109




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
I'm new using the HP Prime. I'm studying Engineering and I'm having trouble using the calculator, specially solving system of ecuations.
I have downloaded your application, but still can't solve the system. It will mean a lot for me if you can help me. The ecuations are: 0.05000767076=19.93*10^(3)*V+8.81*10^(3)*W (V^2/2)−76.2824057829+T(0.25/(LOG((1/2455.875)+(5.74/(159300^0.9*V^0.9))))^2)*470.8097*V^2=0 121.530094217+T(0.25/(LOG((1/1632.625)+(5.74/(105900^0.9*W^0.9))))^2)*1652.502*W^2=0 I need to know the values of V, W and T. My friends have the 50G and use the solvesys and the haven't had any problem. Thank you 

10032018, 06:48 AM
Post: #110




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
(09282018 10:48 AM)Andrea Wrote: I'm new using the HP Prime. I'm studying Engineering and I'm having trouble using the calculator, specially solving system of ecuations. I´ve inserted the equations, and initial values V=1, W=1 and T= 1 and I got: V= 1,4841386 W= 2,3188181 T= 101,06092 [F]= 8.959E10 Are these results what you expected? 

05052019, 08:10 PM
Post: #111




Not able to solve a system
Hello,
I'm trying to solve the following system using SolveSys: (X/Y)^Z = 1/8 2^X/3^Y=4/Z^4 X*Y/Z=8/3 On the HP50g, I just use the equation writer to place all 3 equations on the stack, then create an array with them. I then create an array with [X Y Z] and another with my initial guesses [1 1 1]. I go to NUM.SLV>MSLV and then get an array with 2, 4 and 3 as the answers. However, when trying to solve this system on the Prime using SolveSys, I get the following message: Newton iterations terminated but F failed tolerance The (incorrect) answers that I get are X=1.505 Y=4.984 Z=2.759 What am I doing wrong? 

05062019, 12:33 AM
(This post was last modified: 05062019 12:37 AM by Han.)
Post: #112




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
(05052019 08:10 PM)rrpalma Wrote: Hello, Probably nothing. The message simply means that the preset number of iterations were reached but that the solution was still not obtained. I have not tried the system myself or even looked at the mathematical reasons, but just an initial gut feeling based on your numerical values I would say the system is slow to converge numerically. Just rerun the solver again and see if the values get closer to the solution found on the HP50G. EDIT: What I mean is to run the solver using the current values for X Y and Z as your new initial guess. You can also change the max number of iterations in the options. Lastly, you should be able to see the result of each step to at least see if the convergence is slow. Graph 3D  QPI  SolveSys 

05062019, 01:53 PM
Post: #113




RE: 25MAR2017 SolveSys  Equation Library and Nonlinear Systems Solver
Thanks Han for your promptly replying to my post.
You were right! It took three runs to find a zero. I used the previously found on run (n1) variable values as guesses for run (n). However, when I increased the number of iterations from 100 to 1000, the program did not converge on the first run. Thanks a lot for pointing me in the right direction. This is a great app. 

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