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janhardo

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These are questions asked by janhardo

Plotting a grid for portion of curve ...

janhardo 335 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 335 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 335 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

 

How to get a legenda with y, y ' , ...

janhardo 335 Maple
derivative programming plotting
May 28 2020
1 2

For to know what each graph is standing for in the plot legenda

Could not yet get it  in y , y' , y '' , to 5th derative 

Better is perhaps to have vertical table with the names and function expression together , but that could be difficult betounes_ex_set_task_4def.mw  

Different output for function definition...

janhardo 335 Maple 2018
worksheet output operator
May 28 2020
0 1

 

f := x -> exp(-x)*sin(x); intvx:= 0..3;
f := proc (x) options operator, arrow; exp(-x)*sin(x) end proc
intvx := 0 .. 3
 

And this one below ( i prefer this one ) , but got in worksheet now the one above
Probably a option issue ?

 

 

f := x -> exp(-x)*sin(x); intvx:= 0..3;

proc (x) options operator, arrow; exp(-x)*sin(x) end proc
 
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