MATLAB中2个向量的2列矩阵 [英] 2-column matrix from 2 vectors in MATLAB

问题描述

这感觉应该很简单.

我正在建立一个最小距离分类器，我想将feature1和feature2放在同一矩阵中，以便我可以调用它们并得到这样的答案.

I am building a minimum distance classifier and I want to put feature1 and feature2 into the same matrix so that I can call them and get answers like this.

featureVector(1,:) =所有feature1值

featureVector(2,:) =所有feature2值

我正在遍历，希望在循环运行时将这些值放入featureVector.

I'm looping through and hoping to put these values into the featureVector as the loop runs.

我是MATLAB的新手，所以我不确定如何将其表达出来.希望这有足够的道理.

I'm fairy new to MATLAB so i'm not sure how to put that into words. Hopefully that makes enough sense.

谢谢大家.

推荐答案

如果您的feature1是水平矢量，则请执行以下操作:

If your feature1 is a horizontal vector, then do:

featureVector = [ feature1 ; feature2 ]

否则(如果是垂直的话)，请执行以下操作:

Else (if vertical), do:

featureVector = [ feature1 , feature2 ]

如果您不知道它的方向，则可以随时执行reshape:

If you don't know it's orientation, you can always do a reshape:

feature1 = reshape(feature1, 1, numel(feature1))

...是什么使feature1水平，或者:

... what will make feature1 horizontal, or:

feature1 = reshape(feature1, numel(feature1), 1)

...什么会使feature1垂直.

... what will make feature1 vertical.

reshape将从任何向量/矩阵生成水平/垂直向量，并与原始来源一一对应地取特定值.

reshape used like that will make horizontal/vertical vector from any vector/matrix, taking particular values one-by-one from the original source.

编辑:有效的证明:

>> a = [1 ; 2 ; 3 ; 4 ; 5];
>> b = [6 ; 7 ; 8 ; 9 ; 10];
>> ab = [a, b]

ab =

     1     6
     2     7
     3     8
     4     9
     5    10

>> ab(2,:)

ans =

     2     7

编辑:如果您的feature1和feature2是标量，并且您想在每次迭代中将它们分别添加到featureVector中，请执行以下操作:

Edit: If your feature1 and feature2 are scalars, and you want to add them to the featureVector one-by-one in every iteration, then do:

featureVector = []

for i = 1:...
    feature1 = ...;
    feature2 = ...;
    featureVector = [featureVector; [feature1, feature2]];
end

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