Question regarding matrix manipulation

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Mate 2u
Mate 2u 2012-6-28
Hi all,
I have a (50x1) Array A2 which is a series of uneven sequential numbers (serial times), And a (50x1) array B2 of numbers (prices corresponding to prices).
A2 is our X axis and B2 is our y axis.
Now I have a new X axis X2 which is of size (99x1).
I want to fit the prices into the new 99x1 axis, so for 50 we have the corresponding values but for the 49 missing we want to fill in the value using neirought neibour but rather than looking above and below, it will just use above.

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回答（1 个）

Honglei Chen
Honglei Chen 2012-6-28
编辑：Honglei Chen 2012-6-28
Y2 = interp1(X1，Y1，X2，'nearest')
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Mate 2u
Mate 2u 2012-6-28
The reason why I get this error is that for my x axis, as is it is a financial time series there are some times which have two prices at the same time.....is there a way around this?
Honglei Chen
Honglei Chen 2012-6-28
Are you saying if you have two points (x=1,y=3) and (x=2,y=4) and when you want to calculate the value at x=1.2, you want to return 4? Then this is not really nearest neighbor, you may need to do this on your own.
As to the second issue, you will have to do some pre-processing. Otherwise it's not a function and the interpolation won't work. For example, you can use unique() to keep either the lower or higher value.

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