如何重塑和交织矩阵元素? [英] How to reshape and interleave matrix elements?

问题描述

具有时间序列的值，我想将其重塑为nx4矩阵[X y]，目的是将这些值用作机器学习算法的输入和输出值.

Having the values of time sequence, I would like to reshape it into a nx4 matrix [X y], for the purpose of using these values as input and output values for machine learning algorithm.

X(i)是1x3输入向量，y是输出标量值.

X(i) is a 1x3 input vector and y is output scalar value.

该算法将每个第2个序列值(3个值)作为输入，以预测第4个值.

The algorithm takes as an input every 2nd sequence value (3 values) in order to predict the 4th value.

举一个实际的例子，假设我们有一个序列

To give a practical example, let's say we have a sequence

[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16]

[X y]矩阵应为:

The [X y] matrix should be the following:

[1 3 5 7; 2 4 6 8; 9 11 13 15; 10 12 14 16]

为了获得第二行，我编写了以下代码:

To get every second row I wrote the following code:

vec1 = timeSeries(1:2:end);
XyVec1 = reshape(vec1,4,[])' 

类似地，它可以写成偶数:

similarly it could be written to get even numbers:

vec2 = timeSeries(2:2:end);
XyVec2 = reshape(vec2,5,[])'

我不知道该怎么做的是交织矩阵vec1和vec2行以获得

The thing that I don't know how to do is to interleave matrix vec1 and vec2 rows to get

[vec(1,:); vec2(1,:);vec1(2,:), vec2(2,:)...]

有人知道如何交织两个(或更多)矩阵的行吗?

Does anyone know how to interleave the rows of two (or more) matrices?

推荐答案

尝试

result = zeros(size(vec1,1)+size(vec2,1),size(vec1,2));
result(1:2:end,:) = vec1;
result(2:2:end,:) = vec2;

在正确的行中重复使用matlab索引工具或插入元素

Reuse matlab indexing facilities ot insert elements in correct rows

样本八度音阶模型: http://ideone.com/RVgmYA

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