%BP神經(jīng)網(wǎng)絡(luò)實現(xiàn)與數(shù)據(jù)預(yù)測
close?all?
clear?
%%
%讀取文件（根據(jù)數(shù)據(jù)路徑更改）
filename=‘E:\y\12.txt‘;
data=textread（filename）;
%取前25組數(shù)據(jù)作為樣本
data1=data（:1）;
data2=data（:2）;
xaxis=data1（1:25）‘;
yaxis=data2（1:25）‘;
%%
%創(chuàng)建BP神經(jīng)網(wǎng)絡(luò)
n=20;%神經(jīng)元個數(shù)
net?=?newff（minmax（xaxis）[n1]{‘tansig‘?‘purelin‘}‘trainlm‘）;
%當前輸入層權(quán)值和閾值?
inputWeights=net.IW{11}?
inputbias=net.b{1}?
%當前網(wǎng)絡(luò)層權(quán)值和閾值?
layerWeights=net.LW{21}?
layerbias=net.b{2}?
%BP網(wǎng)絡(luò)