無(wú)償帶寫(xiě)matlab，要的留下題目！

雨情 · 發(fā)表于 2023-4-22 07:31:03

剛學(xué)沒(méi)多久，可能不是全會(huì)！

深度大腦 · 發(fā)表于 2023-4-22 07:31:55

A*算法求最短路徑

酷畢啦電子 · 發(fā)表于 2023-4-22 07:32:19

請(qǐng)問(wèn)已知有1500個(gè)數(shù)據(jù)按照時(shí)間排列，我想給這1500個(gè)數(shù)據(jù)編號(hào)，依次為1到1500，并且在我把數(shù)據(jù)打亂后，每個(gè)編號(hào)所對(duì)應(yīng)的數(shù)據(jù)依然不變。謝謝

會(huì)發(fā)光的工程師 · 發(fā)表于 2023-4-22 07:32:50

3.439（0.05/（1+y）+1.05/(1+2y))=3.5639
求大神幫下忙~

電子工科男 · 發(fā)表于 2023-4-22 07:33:18

function [eigvector, eigvalue, Y] = LDA(X,gnd)

old_X = X;

% ====== Initialization
[nSmp,nFea] = size(X);  % 當(dāng)有兩個(gè)輸出參數(shù)時(shí)，size函數(shù)將矩陣的行數(shù)返回到第一個(gè)輸出變量r，將矩陣的列數(shù)返回到第二個(gè)輸出變量c。  得到樣本的維數(shù)和個(gè)數(shù)
classLabel = unique(gnd);  %取集合a的不重復(fù)元素構(gòu)成的向量
nClass = length(classLabel);%如果A為非空數(shù)組，返回行數(shù)和列數(shù)兩者之間數(shù)值較大的那一個(gè)值，即相當(dāng)于執(zhí)行了max(size(A))
bPCA = 0;
if nFea > (nSmp - nClass)
PCAoptions = [];
PCAoptions.ReducedDim = nSmp - nClass;
[eigvector_PCA, eigvalue_PCA, meanData, new_X] = PCA(X,PCAoptions);
X = new_X;
[nSmp,nFea] = size(X);
bPCA = 1;
end

sampleMean = mean(X);

MMM = zeros(nFea, nFea);
for i = 1:nClass,
index = find(gnd==classLabel(i));
classMean = mean(X(index, :));
MMM = MMM + length(index)*classMean'*classMean;
end
W = X'*X - MMM;
B = MMM - nSmp*sampleMean'*sampleMean;

W = (W + W')/2;
B = (B + B')/2;

option = struct('disp',0);
[eigvector, eigvalue] = eigs(B,W,nClass-1,'la',option);
eigvalue = diag(eigvalue);

for i = 1:size(eigvector,2)
eigvector(:,i) = eigvector(:,i)./norm(eigvector(:,i));
end

if bPCA
eigvector =eigvector_PCA*eigvector;
end

if nargout == 3
Y = old_X * eigvector;
end

LDA算法代碼看不懂  大神幫個(gè)忙寫(xiě)點(diǎn)注釋啊