MATLAB:插值向量 [英] MATLAB: interpolate vector
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问题描述
如何在MATLAB中内插向量?
How can I interpolate a vector in MATLAB?
例如,我有以下矩阵:
M=
1 10
2 20
3 30
4 40
M
的第一列表示x
坐标的独立参数,而M
的第二列表示输出或y
坐标.
The first column of M
denotes the independent parameter of x
coordinate while the second column of M
denotes the output or y
coordinate.
我还有以下输入向量:
a =
2.3
2.1
3.5
对于每个a
值,我希望确定输出插值结果将是什么.在这种情况下,给定a
,我希望返回
For each value of a
, I wish to determine what the output interpolated result would be. In this case, given a
, I wish to return
23
21
35
推荐答案
这是修改后问题的答案,即如何插值"
Here's the answer to the question after the edit, i.e. "how to interpolate"
您要使用 interp1
M = [1 10;2 20;3 30;4 40];
a = [2.3;2.1;3.5;1.2];
interpolatedVector = interp1(M(:,1),M(:,2),a)
interpolatedVector =
23
21
35
12
这是在向量中找到两个最接近的条目"的问题的答案,即编辑之前的原始问题.
Here's the answer to the question "find the two closest entries in a vector", i.e. the original question before the edit.
x=[1,2,3,4,5]'; %'#
a =3.3;
%# sort the absolute difference
[~,idx] = sort(abs(x-a));
%# find the two closest entries
twoClosestIdx = idx(1:2);
%# turn it into a logical array
%# if linear indices aren't good enough
twoClosestIdxLogical = false(size(x));
twoClosestIdxLogical(twoClosestIdx) = true;
twoClosestIdxLogical =
0
0
1
1
0
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