用于近红外光谱中进行校正集和验证集近红外光谱的选择源码程序MATLAB - matlab算法设计

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标题：用于近红外光谱中进行校正集和验证集近红外光谱的选择源码程序MATLAB
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所属分类: 算法设计资源类型：程序源码文件大小: 2.46 KB 上传时间: 2019-12-01 22:09:43 下载次数: 4 资源积分：1分提供者: jiqiren 20191201101033907

内容：
function m= spxy(X,y,Ncal)

%+++ Employ the Sample Set Partitioning Based on Joint X-Y Distance for selecting the representative samples;

%+++ X: a n x p matrix with n samples and p variables.

%+++ Ncal:number of calibration samples,no more than the total number of samples

%+++ m: sample index

%+++ zhushi,Oct 13,2013.

dminmax = zeros(1,Ncal); % Inicializes the vector of minimum distances.

M= size(X,1); % Number of objects

samples = 1:M;

Dx = zeros(M,M); % Inicializes the matrix of X-distances.

Dy = zeros(M,M); % Inicializes the matriz de y-distances.

for i = 1:M-1

xa = X(i,:);

ya = y(i,:);

for j = i + 1:M

xb = X(j,:);

yb = y(j,:);

Dx(i, j) = norm(xa-xb);

Dy(i, j) = norm(ya-yb);

end

Dxmax = max(max(Dx));

Dymax = max(max(Dy));

D= Dx/Dxmax + Dy/Dymax; % Combines the X and y distances.

% D is an upper triangular matrix.

% D(i,j) is the distance between objects i and j (j > i).

[maxD,index_row] = max(D);

% maxD is a row vector containing the largest element for each column of D.

% index_row is the row in which the largest element of the column if found.

[dummy,index_column] = max(maxD);

% index_column is the column containing the largest element of matrix D.

m(1) = index_row(index_column);

m(2) = index_column;

for i = 3:Ncal

pool = setdiff(samples,m);

% Pool is the index set of the samples that have not been selected yet.

dmin = zeros(1,M-i + 1);

% dmin will store the minimum distance of each sample in “pool” with

% respect to the previously selected samples.

for j = 1:(M-i + 1)

indexa = pool(j);

d = zeros(1,i-1);

for k = 1:(i-1)

indexb = m(k);

if indexa < indexb

d(k) = D(indexa,indexb);

else

d(k) = D(indexb,indexa);

end

dmin(j) = min(d);

end

% At each iteration, the sample with the largest dmin value is selected.

[dummy,index] = max(dmin);

m(i) = pool(index);

end

文件列表（点击上边下载按钮，如果是垃圾文件请在下面评价差评或者投诉）:

用于近红外光谱中进行校正集和验证集近红外光谱的选择源码程序MATLAB/
用于近红外光谱中进行校正集和验证集近红外光谱的选择源码程序MATLAB/code/
用于近红外光谱中进行校正集和验证集近红外光谱的选择源码程序MATLAB/code/ks.m
用于近红外光谱中进行校正集和验证集近红外光谱的选择源码程序MATLAB/code/spxy.m

关键词：近红外 光谱 源码 程序 MATLAB

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