This is the problem: My object is getting large with many private methods.

In non-OOP setup, I could make different modules A,B,C and put relevent methods inside each module.

Now I find I can not do this inside the object. All methods have to be flat and at same level. So I lose the benefit of using different name space for different methods.

It will be easier to explain with a simple example. Lets say I have this now

restart;

A:=module() 
    option object; 
    local name::string:="";  

    export ModuleCopy::static:= proc( self, proto, name::string, $)          
         self:-name := name;
    end proc;

    export process_1::static:=proc(_self,$)
       _self:-process_2();
    end proc;

    local process_2::static:=proc(_self,$)
       print("in process_2 ",_self:-name);
    end proc;

end module; 

The above works by having all methods at same level. I can now do 

o:=Object(A,"me");
o:-process_1()

                  "in process_2 ", "me"

But now as the number of private methods increases I want to put a name space around collection of these for better orgnization, but keep all methods logically as part of the object as before.

I change the above to be

restart;

A:=module() 
    option object; 
    local name::string:="";  

    export ModuleCopy::static:= proc( self, proto, name::string, $)          
         self:-name := name;
    end proc;

    export process_1::static:=proc(_self,$)
       o:-B:-process_2();
    end proc;
    
    #method process_2 is now inside a module. 
    local B::static:=module()
       export process_2::static:=proc(_self,$)
           print("in B:-process_2 ",_self:-name);
       end proc;
    end module;

end module; 

Now

o:=Object(A,"me");
o:-process_1()

Gives an error

Error, (in unknown) invalid input: process_2 uses a 1st argument, _self, which is missing

I tried many different combinations, but nothing works.

So right now I have all methods flat. All at same level. But I do not like this setup. Since I lose the nice modular orgnization I had with using different modules with different methods inside different modules.  

Is there a way to have a module inside an object and call its methods from inside the object as if these method were part of the object private method with only differece is adding the module name in between?

So instead of _self:-foo()  I just change it to  _self:-B:-foo() and have both behave the same way?

In C++, one can use what is called a friend class to do this. 

Please I will like to know if there exists any command to isolate the known regular mathematical functions from an expression. For example, given the equation 

I need a means of isolating (e^x & sin(v)) from the above expression

Thanks

How to get a plot where a unit cube [0,1]X[0,1]X[0,1] in R^3 is intersected by a plane $x+z=1$. Please give me a code

where p, q, r, a are positive constants and phi(0) be a initial condition

I'm not sure if this can even be done, but if it's possible, how do I do it:

I have a python script called "Blue.py", the path should simply be "Blue.py", since my worksheet and the python script are saved in the same place.

I want to somehow import two arrays and an equation from maple to said python script, use them in a procedure there, and then import the output of said procedure, a 2d array, backwards to maple.

I don't really care what format the equation and the arrays take in python (the current version assumes types "np.array" for the arrays and type procedure for the equation, but I can always adjust it), but the type of the output of Blue.py should be of the form 2d Array (for example [[0,1],[8,-2],[3,3]] ).

Is it possible to shuffle input between maple worksheets and python scripts like that, and if so, how? 

The uploaded worksheet is a failed attempt at this proof.

Please either refer me to or show me a valid proof.

  *** I have tried to upload my worksheet using the green arrow but the insert link operation of the upload failed ***

cc

PDF ready for download.

Error occurred during PDF generation. Please refresh the page and try again

int(int(x^(alpha + 1)*y^(beta + 1)*exp(-(x^2 + y^2)/(4*Pi))/sqrt(x^2 + y^2), x = -R .. R), y = -R..R) assuming x>0, y>0, R>0;

I am trying to evaluate the above symbolic integral but Maple returns the same input in Symbolic form without evaluating it at all. Is there something wrong with my approach?

This is another bizzar behaviour of objects. I created a basic object of type person.  Noticed that after issuing the call copy(object,deep) and not doing anything at all with the result. Just made the call only, then I am not longer able to create new objects of this class. I had to restart the session to be able to create new objects again.

Why?  This seems like something went messy with memory layout. I put a print message in the constructor, and see that this message no longer show up  after the call copy(object,deep) even though this call was not used for any purpose as you see, but to only to see its effect on the session.

Any explanation why one can no longer create new objects after doing this?  Here is the workseet

Download deep_call_problem.mw

I  generated some graphs via maple and would like to put them in my paper. So I am going to convert the following worksheet to pdf.

with(GraphTheory):
Graphs:=[NonIsomorphicGraphs(6,8,output=graphs,outputform = graph)]:
num_g:=nops(Graphs):
num:=ceil((num_g)/5.):
M1:=Matrix (num,5,(i,j)->`if`((i-1)*5+j<=num_g, DrawGraph(Graphs[(i-1)*5+j],size=[250,250] ,overrideoptions ,showlabels=false,style=planar, stylesheet =  [
 vertexcolor     = orange
,vertexfontcolor = black
,vertexborder    = false
,edgethickness   = 0.6
,edgecolor       = MidnightBlue
,vertexshape     =  "circle"
,vertexfont      = [Arial, 4],
vertexthickness=5], caption = cat(H__,5*(i-1)+j),captionfont=["ROMAN",7]),plot(x = 0 .. 1, axes = none))):
DocumentTools:-Tabulate (M1[1..5,.. ],widthmode=percentage ,width=80 , exterior =all) :

But there was a problem with the exported pdf. There was some mosaic stuff at the vertices of all those graphs. It was strange. (I want to reduce the size of vertices of the graphs in order not to look crowded.)

• TST.mw
• TST.pdf

Only when I insert the option vertexpadding and set a large enough size  of vertex (for this example, we set vertexpadding=7),  it won't go wrong. However, in fact, we often need make vertice‘s size smaller , especially when there are more vertices.

Using a pdf viewer, it seems that after exporting, there is a box above each vertex.

As I was trying things with Maple OOP, I noticed strange behavior which I do not understand. I'll explain the problem in words first then given an example.

I have Person class. Then made one instance of it. In this class, there is one method which is defined to take in an object of same type as the class itself.

I found when I pass the object itself to its own method, it gives an error that the method expects a second argument of type person which is missing. But it is not missing.

Then when creating a second object of same type, and passing the second object, it worked! 

Why?  Here is MWE. Attached worksheet.  I would have expected same behavior in both cases. EIther both work, or both do not work. As as long as the object being passed is the correct type (person).

It seems in the first case, Maple noticed the object being passed to the method happened to be same object where this method is, and it did not pass it. Hence the missing second argument.  Is this a documented behaviour somewhere? (I made sure to make all method static though, so same code is used by all instances of the class. This is strange error message).
 

Download why_first_call_fail.mw

Update

Ok, I am all set. I found a good way to do this. i.e. pass the object to one of its method. One has to make a copy of the object first and pass the copy. Can't use the same object. This is how I do it now. 

restart;
person:=module() 
    option object;
    export name::string:="";  

     export ModuleCopy::static:= overload( 
     [ 
         proc(_self,proto, $)option overload;
            print("Enter 2 args constructor of person");  
            #do nothing    
         end proc,

         proc(_self,proto, name::string, $) option overload; 
             print("Enter 3 args constructor of person");      
             _self:-name := name;
        end proc
     ]);

    export process::static:=proc(_self, the_input::person,$)
       print("the_input:-name = ",the_input:-name);
    end proc;
    
end module; 


p:=Object(person,"me");
#p:-process(p);  #instead of this do the following
o:=Object(p);
p:-process(o)

Which works and gives

              "Enter 3 args constructor of person"
                  p := Object<<2370600065568>>
              "Enter 2 args constructor of person"
                  o := Object<<2370600048288>>
                   "the_input:-name = ", "me"

So I am now able to pass the object (or rather copy of it) as explicit argument to other methods and other modules.  I am not sure why it does not work when using the object itself and had to make a copy. 

How to integrate the below function from 0 to eta.

A := P(eta)+S(H-2*`cosθ`(eta+1)*F)+`cosθ`*(2*F(eta)-2*H*F) = S(eta+1)*`sinθ`*F(theta)-`sinθ`(F*H(theta)-H*F(theta)+F(theta, eta))

Thanks in advance

How does one undo an overload?                                                                        

Download DynamicSystem-How_to_ODE.mw

Hi experts, I know built in command to solve definite integral by using simpson and trapezoidal rule but i need to show step which is given in the example to satisfy his students of grade 12. Please help me to solve this example

I have an animation in Maple that only works if I use the option frames=120, or anything >120. Anything less and it gives the error "Error, (in plots/animate) points cannot be converted to floating-point values". I don't understand why this restriction is happening, any advice is appreciated.