Turning array values into values on an x axis

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Tom
Tom 2012-5-1
Suppose I had a double array and the values were 2,3,6 and 9.
How would I create a double array where all of the values are 1, except the 2nd, 3rd, 6th and 9th, which are 2?
  2 个评论
Daniel Shub
Daniel Shub 2012-5-1
You link to double seems broken.
What have you tried so far?
Matt Fig
Matt Fig 2012-11-2
Tom's question
Suppose I had a double array and the values were 2,3,6 and 9.
How would I create a double array where all of the values are 1, except the 2nd, 3rd, 6th and 9th, which are 2?

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采纳的回答

Wayne King
Wayne King 2012-5-1
x = ones(500,1);
indices = [2 3 6 9];
x(indices) = 2;
Or
x = ones(500,1);
x(indices) = x(indices)+1;
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Daniel Shub
Daniel Shub 2012-5-1
Ummm, it is 1x4 in Wayne's answer. It works if you make it 4x1.
Tom
Tom 2012-5-2
Thanks - I got there in the end - I had to round my indices for some reason. Even though some of them had .0000 after it still wouldn't work until those had been removed.
Many thanks Wayne and Daniel.

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