6778 Reputation

18 Badges

10 years, 34 days

MaplePrimes Activity

These are questions asked by nm

I can not find my Kamke book right now. But according to Maple help, Homogeneous ODE of Class C is the following

If I understand the above, it is saying that the RHS of the ode should be ratio of two polynomials, and both should be linear in y and x. Correct?

Given the above, then why Maple says the following ode is _homogeneous, `class C` ? Since the RHS is not linear in y and not linear in x:



           [[_homogeneous, `class C`], _rational]

What Am I overlooking/misunderstanding  from reading this definition? 

in Maple 2022.1 on windows 10


`Standard Worksheet Interface, Maple 2022.1, Windows 10, May 26 2022 Build ID 1619613`


`The "Physics Updates" version in the MapleCloud is 1288 and is the same as the version installed in this computer, created 2022, August 6, 16:9 hours Pacific Time.`



Error, (in gcdex) invalid arguments


Why it happens and is there a workaround?

Does it happen on earlier versions? I do not have an earlier Maple installed on my current PC as it is new to check. 

Download int_problem_8_10_2022.mw

I have string of length


When doing


Maple gives


From help:

split a string into equal length pieces


This is all done in .mpl  file actually, not interactive, but I made the above worksheet to show  the problem. The string is read from a file by a program and it wants to split it to 100 length smaller strings.

I have lots of RAM. 128 GB.  So why does Maple crash and is there a workaround this?

This string was generated by another software.

I have attached the above example below as worksheet.  Maple 2022.1 on windows 10.

Here is a simpler way to generate this problem




Using trial and error, the crash happens when the length reaches 1073101. At 1073100 there was no crash.



Found case where PDEtools:-Solve gives exception but not solve.

Is this known issue?


`Standard Worksheet Interface, Maple 2022.1, Windows 10, May 26 2022 Build ID 1619613`


result:=simplify(result) ;
PDEtools:-Solve(result = 0,t) assuming t::real

(1/2)*(Dirac(1, -t+4+k)+Dirac(1, t-4+k)-Dirac(1, -t+4+k)*cos(-t+4+k)+2*Dirac(-t+4+k)*sin(-t+4+k)+2*sin(t-4+k)*Dirac(t-4+k)-Dirac(1, t-4+k)*cos(t-4+k))/k

(1/2)*(Dirac(1, -t+4+k)+Dirac(1, t-4+k)-Dirac(1, -t+4+k)*cos(-t+4+k)+2*Dirac(-t+4+k)*sin(-t+4+k)+2*sin(t-4+k)*Dirac(t-4+k)-Dirac(1, t-4+k)*cos(t-4+k))/k

Error, (in assuming) when calling 'RootOf'. Received: 'expression independent of, _Z, RootOf'

solve(result = 0,t) assuming t::real


Download exception_from_Solve_august_8_2022.mw

I create a plot, then later on, I want to use the same view for a second plot or using the same starting x, ending x and starting y and ending y. For reasons no need to get into into, I need to do this and I have no access to this information at this time. I only have access to the p variable used to store the plot into as in this example below.

I am not sure what is the correct way to do read this information from the PLOTS structure as I never used it before. 

Help describes the PLOTS structure under "PLOT and PLOT3D Data Structures" , but do not see how is one supposed to read different parts of it. I could have missed it. Maple help pages are very hard for me to read in order to obtain the information needed. From help it says:

The Maple plotting functions, plot, plot3d, and others, produce PLOT and PLOT3D data structures describing the images to be displayed.

By trial and error, for standard plot this worked



           "originalview" = [-0.9862500000 .. 9.9862500000, -1.0000000000 .. 1.0000000000]

I see also that command plottools:-getdata(p):  returns the data. So I could also do (it is stored in matrix, in third entry):


Will the above work all the time? should this command be used to obtain this information or is there a better way?

When I lprint(p) I see these fields have actual names. For example  , here is screen shot of lprint(p)  


it looks like  a RECORD data structure. But when I tried p:-originalview  Error, `p` does not evaluate to a module 

The question is: What is the correct way to find what x range and y range was used for an earlier plot, given one has access only to p variable used to store the output of the plot command?  This is for 2D plot only.

1 2 3 4 5 6 7 Last Page 1 of 133