Question about how to formulate this vector

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!

Answer 1

[Star Strider]

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.

[Tiankang Xie]

Thank you so much that's really awesome!

[Star Strider]

My pleasure!

The sincerest form of appreciation here on MATLAB Answers is to Accept the Answer that most closely solves your problem.

Answer 2

[Image Analyst]

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.

[Image Analyst]

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]

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]

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]

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]

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.