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what correction is required in the code?

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Manav Divekar
Manav Divekar 2021-11-11
关闭： Cris LaPierre 2021-11-11
I am trying to perform 2*2 + 2*5 + 5*8, for [2 2 5 8] vector which is product of consicutive and sum of all. without using sum() & diff() and using for loop
function [out] = pairprodsum (m)
s = 0
for i = 1
b = m(1:end-1).*m(2:end);
s = s + b;
end
out = s;

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James Tursa
James Tursa 2021-11-11
If the homework assignment specifies you must use a loop, then I don't think the intent was for you to wrap a simple i=1 range around vectorized code. That being said, I suppose your "loop" technically qualifies.
b is a vector. You simply need to sum all the elements of b and return that. s = s + b does not sum the element of b ... it simply creates a new vector s that is a copy of b. You need different code to sum the elements of b. There are various ways to do this, which I will let you figure out.
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Manav Divekar
Manav Divekar 2021-11-11
its just gives sum of only first postion of the arrey.
James Tursa
James Tursa 2021-11-11
How could you maybe change the for loop range so it added up all of the elements?
Jan
Jan 2021-11-11
编辑：Jan 2021-11-11
A hint: You want to perform this:
  • s = 0
  • s = s + 2*2
  • s = s + 2*5
  • s = s + 5*8
You need to loop over the indices of m. There is 1 iteration less than the number of elements of m.

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