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lcz

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6 years, 130 days
changsha, China
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These are questions asked by lcz

Is there any simplified code for class...

lcz 994 Maple
graphtheory
April 25 2020
1 6

As the title says， I'd like to  divide Non-isomorphism  graphs of order 7   into 6 parts according  diameter of graph.

I write following codes:

restart:
with(GraphTheory):
for i from 1 to 7 do
D||i:=[]:
od:

prc:=NonIsomorphicGraphs(7,output=iterator,outputform=graph,restrictto = connected ):
graphmark := prc():                      
while graphmark <> FAIL  do               
    if Diameter(graphmark) = 1 then  
         D1:=[op(D1),graphmark]; 
      elif Diameter(graphmark) = 2 then
         D2:=[op(D2),graphmark];
      elif Diameter(graphmark) = 3 then
         D3:=[op(D3),graphmark];
      elif Diameter(graphmark) = 4 then
         D4:=[op(D4),graphmark];
      elif Diameter(graphmark) = 5 then
         D5:=[op(D5),graphmark];
      elif Diameter(graphmark) = 6 then
         D6:=[op(D6),graphmark];
      fi:                                
     graphmark:=prc():                 
end do:

But I think  conditional statements  if.. elif are used to many  in  above maple  codes,  it is not concise.  

How to write better?

 

 

How to make function composition easi...

lcz 994 Maple
composition rtfm
April 21 2020
1 0

 I'd like to  make following function  composition 6 times,  the  notation @  is used  6 times.  How to write it easily?

f:=x->sqrt(1+x);
(f@f@f@f@f@f)(x)

how to integrate arccos(x)*arcsin(x)?...

lcz 994 Maple 2020
integration
April 17 2020
3 1

This Anti-derivative of  arccos(x)*arcsin(x), Maple  2020 cannot do that? It seems not difficult.

int(arccos(x)*arcsin(x),x)

In Mathematica, we can easily to get output :

2 x - Sqrt[1 - x^2] ArcSin[x] +  ArcCos[x] (Sqrt[1 - x^2] + x ArcSin[x])

Physics Updates" version "642 is  insta...

lcz 994 Maple 2020
physics
April 16 2020
1 1

Today I Installed  Physics Updates" version "642 in Maple2020, why does it tell me  it has installed but is not active? How to active it?

Physics:-Version(latest)

`The "Physics Updates" version "642" is installed but is not active. The active version of Physics is within the library D:\\Program Files\\Maple 2020\\lib\\maple.mla, created 2020, March 5, 9:36 hours`

Which function is good for displaying...

lcz 994 Maple 2019
color maplets
April 09 2020
1 4

 

In maple, how to change strings style? Thanks!  

In Mathematica , we can choose Style to change strings style.

Style["A", Blue, Italic, 24]

 

source of the  problem : I make an User Interface.

the color of   "mass "  may consider be changed to  red . 

 

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