Add 3 to just the odd-index elements

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Edward Prentice
Edward Prentice 2013-10-11
评论： Edward Prentice 2013-10-15
I am using this help-yourself http://www.facstaff.bucknell.edu/maneval/help211/exercises.html
And have a question regarding 2. Let x = [2 5 1 6]. b. Add 3 to just the odd-index elements
They give the answer as
b = x(1:2:end) + 3
but that makes a new matrix with just two numbers in it.
Like so: "b =
21 20
"
Is the question or the answer wrong?

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-10-11
编辑：Azzi Abdelmalek 2013-10-11
x = [2 5 1 6]
x(1:2:end)= x(1:2:end) + 3

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