How can I do 1-D interpolation with INTERP1 to find the nearest value to the left of the point (i.e. a zero-order hold curve) in MATLAB?

2012 8 16
1 个回答
回答已采纳
更新时间：2015 2 6
10 次查看（30 天）

1 个投票

I want to do 1-D interpolation such that the interpolated value for a given point will be equal to the value of the point which is closest and on the left (i.e., smalller than the given point) of the data set. 'Nearest' method of INTERP1 function does not work as I want since the nearest point might be to the right of (i.e., larger than) the given point.

请先登录，再回答此问题。

 采纳的回答

1 个投票

The easiest and probably fastest way to achieve that is to use histc respectively histcounts.
Code example:
 
% create some example data
x=linspace(0,10,100);
y=sin(x);
% those are the query points
xi=linspace(1,9,50);
% use histcounts to get the locations
% of the nearest left neighbours
[~,~,bin]=histcounts(xi,x);
plot(x,y,'b*')
hold on
plot(xi,y(bin),'r*')
Note that you would have to add some guard when interpolating data points outside the range of x.
 

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by