Question about how to formulate this vector

2015 9 27
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更新时间：2015 9 28
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Hey guys,
I am having a trouble now.
I would like to create a vector, a2 = 1.0000 0.5000 0.3333 0.2500 0.2000, but I can only have "exactly one line of code".
For example, the code xx = 1 : 6 is acceptable; the code xx = [1, 2, 3, 4, 5, 6] is not.
In addition, loop is not the right choice.
Could someone help me about it?Thanks a lot!

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 采纳的回答

Star Strider
Star Strider 2015-9-27

0 个投票

I would generate ‘a2’ simply as:
a2 = 1./[1:6]
a2 =
1 0.5 0.33333 0.25 0.2 0.16667
One line of code, as required.

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Tiankang Xie
Tiankang Xie 2015-9-28
Thank you so much that's really awesome!
Star Strider
Star Strider 2015-9-28
My pleasure!
The sincerest form of appreciation here on MATLAB Answers is to Accept the Answer that most closely solves your problem.

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更多回答（1 个）

Image Analyst
Image Analyst 2015-9-27

0 个投票

The line of code
xx = [1, 2, 3, 4, 5, 6]
is exactly one line of code. Why do you insist it's not?
My solution to your question is to simply do this:
a2 = [1.0000 0.5000 0.3333 0.2500 0.2000]
Note, it is definitely one single line of code.

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Image Analyst
Image Analyst 2015-9-27
Alternatively, another way is
a2 = ones(1,5) ./ [1:5]
However if that's your homework, now you can't use it because that would be plagiarizing, and you'll have to find another solution. But I'm sure it's not your homework or else you definitely would have tagged it as homework.
Tiankang Xie
Tiankang Xie 2015-9-27
I think I might need to use functions or special notations to represent the vector instead of just typing the vector. Like using functions like"ones, zeros, eye"
Image Analyst
Image Analyst 2015-9-28
You did see the call to ones() I used in the comment, didn't you? Why doesn't that suffice? Why does it even matter how you create the vector? I mean, who cares how you get it as long as you get it?
WAT
WAT 2015-9-28
My best guess is that he or she was looking for a form that is easily generalizable to create an arbitrarily long vector. That's obviously far different from saying "exactly one line of code" though.
Image Analyst
Image Analyst 2015-9-28
If they have an integer n, then the OP can make it general by doing either of these lines:
a2 = ones(1,n) ./ [1:n]
a2 = 1 ./ [1:n]; % Parentheses also work (1:n)
whichever they prefer.

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