MATLAB中2个向量的2列矩阵

Question

This feels like it should be simple.

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,:) = all the feature1 values

featureVector(2,:) = all the feature2 values

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

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

Thanks everyone.

Answer 1

If your feature1 is a horizontal vector, then do:

featureVector = [ feature1 ; feature2 ]

Else (if vertical), do:

featureVector = [ feature1 , feature2 ]

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

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

... what will make feature1 horizontal, or:

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

... what will make feature1 vertical.

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

Edit : A proof that it works:

>> 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

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

Answer 2

您是否考虑过使用它？

results = [values1,values2];