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janhardo

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12 years, 108 days
B. Ed math
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These are questions asked by janhardo

How to make a vector- valued function in...

janhardo 1007 Maple
vector-calculus
June 07 2020
1 14

I think there is a special needed package for this : student vector-calculus ?

 

The same x,y axis for ellipse...

janhardo 1007
implicitplot plotting
June 06 2020
0 3

I tried to get this plot with equal axis for x and y ? 

G:=(x,y)->2*x^2+y^2-2*(x+y+x*y-1);
implicitplot(G(x,y)=0,x=-2..10,y=-2..10,scaling=constrained);

 

Plotting a grid for portion of curve ...

janhardo 1007 Maple
plot rootfinding plotting
June 04 2020
2 33

To do this there should be a plotoption grid[ ], but probably obselote ?
Task (7) ask to plot the curve in rectangle [-,2,2]x[-4,5] : what rectangle?

Try using the Plotbuilder ( )command too( this generates also code )  and  interactive plotbuilder
Plotting this portion of curve in rectangle is not working yet.

ex_set_2_task_7.mw

How to sum all the numbers in a list L o...

janhardo 1007 Maple
programming homework summation
May 30 2020
3 28

I did two attempts with different ideas
 

> 

 

> 

restart;

Task (a) A list of numbers in Maple :

> 

L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (1)
> 

 

In general summing up numbers sum(a, i = k .. n) = sum(a_i, i = 1 .. 5) and sum(a_i, i = 1 .. 5) = a1+a2+a3+a4+a5

underscript? ..i like to write a with underscore n : how to that

> 

#S:={seq(L[i],i=1..5)};
> 

#L:= [seq(L[i],i=1..5)];

For summing up numbers in a list of L i can use a ...

Sumlist := proc (L,N):  

> 

Sumlist:=proc(L,N)
> 

   a:=1;
> 

   for i from 1 to N do
> 

      a:=seq(L[i],i=1..5);
> 

   end do;
> 

end proc:
> 

 

Warning, (in Sumlist) `a` is implicitly declared local

  

Warning, (in Sumlist) `i` is implicitly declared local

  
> 

L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (2)
> 

N:=3;

3

 (3)
> 

Sumlist(L,N);

1, 2, 3, 4, 5

 (4)
> 

 

And now to sum the number sequenze  from the procedure?

 

> 

restart;
> 

Sumlist:=proc(L,N)
> 

   a:=1;
> 

   for i from 1 to N do
> 

      a:=seq(L[i],i=1..5);
      #sum(a, i=1..5); # for this probably a second do loop nested ?
> 

   end do;
> 

end proc:
> 

 

Warning, (in Sumlist) `a` is implicitly declared local

  

Warning, (in Sumlist) `i` is implicitly declared local

  
> 

L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (5)
> 

N:=3;

3

 (6)
> 

Sumlist(L,N);

1, 2, 3, 4, 5

 (7)
> 

 

> 

 

> 

 

> 

 

========================================================================

Also possible by? : a1 = 1, a2=a1+1, a3=a2+1, etc

> 

restart;

 

> 

Sumlist:=proc(L,N)
> 

   a:=1;
> 

   for i from 1 to N do
> 

      a:=L[i]+1;
> 

   end do;
> 

end proc:
> 

 

Warning, (in Sumlist) `a` is implicitly declared local

  

Warning, (in Sumlist) `i` is implicitly declared local

  
> 

L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (8)
> 

N:=2;

2

 (9)
> 

Sumlist(L,N);

3

 (10)
> 

L[1];

1

 (11)
> 

 

Try some things out, but summing up list ?


 

Download betounes_ex_set_2_task_5.mw

 

Use of RETURN( ) statement in procedure...

janhardo 1007 Maple
May 29 2020
1 7

Seems to make no difference with or without RETURN() for the procedure ?

 

vraag_op_forum_gesteld_over_boek_vb_binomium.mw

 

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