Sum in a loop

Please someone could help me how to do this in a loop; I am kind of begginer in Matlab:

[Walter Roberson]

Is U superscript arrow subscript j a function or a vector?

[Chad Greene]

What have you tried so far?

[Miguel L]

U is avector

Answer 1

[John BG]

Hi Miguel

with no further information the following does what you ask for

U=randi([-10 10],1,10)
=
  7.00    9.00   -8.00    9.00    3.00   -8.00   -5.00   1.00    10.00  10.00

Select a p such is smaller that at least length(U)-1, for instance

   p=3

the limit for the sum is

   L=length(U)-p
  L =
            7.00

and now let's calculate S

   S=zeros(1,L);
  for k=1:1:L 
     S(k)=sum(U([1:k+p]));
  end

17.00   20.00    12.00     7.00     8.00     18.00    28.00

Since T does not show the vector arrow I understand it's a scalar, so to complete just multiply

S=T*S

If T is a vector, then you could either multiply element by element with

S=T.*S

provided T and S have same size

Miguel

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thanks in advance

John BG

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