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Question: How to sum all the numbers in a list L of numbers

Question:How to sum all the numbers in a list L of numbers

janhardo 430 Maple
programming homework summation add list
May 30 2020
1

I did two attempts with different ideas
 

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restart;

Task (a) A list of numbers in Maple :

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

[1, 2, 3, 4, 5]

 (1)
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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

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

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

Sumlist := proc (L,N):  

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Sumlist:=proc(L,N)
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   a:=1;
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   for i from 1 to N do
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      a:=seq(L[i],i=1..5);
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   end do;
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end proc:
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Warning, (in Sumlist) `a` is implicitly declared local

  

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

  
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L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (2)
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N:=3;

3

 (3)
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Sumlist(L,N);

1, 2, 3, 4, 5

 (4)
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And now to sum the number sequenze  from the procedure?

 

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restart;
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Sumlist:=proc(L,N)
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   a:=1;
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   for i from 1 to N do
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      a:=seq(L[i],i=1..5);
      #sum(a, i=1..5); # for this probably a second do loop nested ?
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   end do;
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end proc:
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Warning, (in Sumlist) `a` is implicitly declared local

  

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

  
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L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (5)
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N:=3;

3

 (6)
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Sumlist(L,N);

1, 2, 3, 4, 5

 (7)
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========================================================================

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

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restart;

 

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Sumlist:=proc(L,N)
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   a:=1;
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   for i from 1 to N do
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      a:=L[i]+1;
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   end do;
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end proc:
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Warning, (in Sumlist) `a` is implicitly declared local

  

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

  
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L:=[1,2,3,4,5];

[1, 2, 3, 4, 5]

 (8)
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N:=2;

2

 (9)
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Sumlist(L,N);

3

 (10)
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L[1];

1

 (11)
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Try some things out, but summing up list ?


 

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