indices to column vectros of a matrix using “crossvalind”

Question

laplace laplace 2013-6-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78310-indices-to-column-vectros-of-a-matrix-using-crossvalind

i got a 3x50 matrix. i would like to obtain the 50 3x1 column vectors and assign to them indices using the crossvalind command seen above

Indices = crossvalind('Kfold',N, 10);

so lets hypotheticaly say that i had a 3x3 matrix named "input" :

input=[1 2 3;4 5 6;7 8 9]

how can I imply an index generation for the vector columns of my "input" matrix using crossvalind?

 A=[1;4;7]
 B=[2;5;9]
 C=[3;6;9]

**the reason i wanna do it is so i can after apply cross validation while having as train/test set these column vectors

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Azzi Abdelmalek 2013-6-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78310-indices-to-column-vectros-of-a-matrix-using-crossvalind#answer_88041

在 MATLAB Online 中打开

A=input(:,1)

3 个评论
显示 1更早的评论隐藏 1更早的评论

Azzi Abdelmalek 2013-6-7

在 MATLAB Online 中打开

What are your feeling about this?

A=[1;4;7]
Indices = arrayfun(@(x) crossvalind('Kfold',x, 10),A,'un',0);

laplace laplace 2013-6-10

can you explain me the command you wrote :D maybe its correct and i am doing smth wrong :(

请先登录，再进行评论。

Answer 2

laplace laplace 2013-6-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78310-indices-to-column-vectros-of-a-matrix-using-crossvalind#answer_88263

编辑：laplace laplace 2013-6-10

在 MATLAB Online 中打开

inputs is the 3x50 matrix

    C = num2cell(inputs,1);
    Indices = cellfun(@(C) crossvalind('Kfold',C, 10),C,'un',0);

Indices =

Columns 1 through 9
    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]
Columns 10 through 18
    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]
Columns 19 through 27
    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]
Columns 28 through 36
    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]
Columns 37 through 45
    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]
Columns 46 through 50
    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]    [3x1 double]