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DTree.java
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172 lines (164 loc) · 4.35 KB
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//0 2 1 0 0 0 2 1 1 0 1 2 1 0 1 2 1 1 0 1 2 0 0 0 1 2 0 0 1 0 1 0 0 1 1 0 1 1 0 0 0 0 0 0 1 2 1 0 0 1 0 1 0 1 1 1 1 1 1 1 1 2 0 0 1 2 1 1 1 0
import java.util.*;
import java.io.*;
class DTree{
public static void main(String args[]){
double log2=Math.log(2);
int i,j;
double syes=0,sno=0,sun=0,over=0,ono=0,oyes=0,rain=0,ryes=0,rno=0;
double gain[]=new double[10];
int table[][]=new int[14][5];
Scanner sc=new Scanner(System.in);
for(i=0;i<14;i++){
for(j=0;j<5;j++)
table[i][j]=sc.nextInt();
}
for(int k=0;k<4;k++){
syes=0;sno=0;sun=0;over=0;ono=0;oyes=0;rain=0;ryes=0;rno=0;
for(i=0;i<14;i++){
if(table[i][k]==0){
sun++;
if(table[i][4]==1)
syes++;
else
sno++;
}
if(table[i][k]==2){
rain++;
if(table[i][4]==1)
ryes++;
else
rno++;
}
}
double eover=45,esun=45,erain=45;
if(sno==0 || syes==0)
esun=0;
else
erain=(-1*rno/rain*(Math.log(rno/rain)/log2))+(-1*ryes/rain*(Math.log(ryes/rain)/log2));
//System.out.print(esun+" "+eover+" "+erain+"\n");
double avenout=(sun/14*esun)+(over/14*eover)+(rain/14*erain);
//System.out.print("Average Entropy: "+avenout+"\n");
double yes=syes+oyes+ryes;
//System.out.print(" Information Gain: "+gain[k]+"\n");
}
double max=0,temp=0;
for(i=0;i<4;i++){
if(max<gain[i]){
max=gain[i];
temp=i;
}
}
if(temp==0)
System.out.print("\tOutlook\n Sunny Overcast Rain\n");
else if(temp==1)
System.out.print("\tTemperature\n High Medium Cold\n");
else if(temp==2)
System.out.print("\tHumidity\n Hig Medium Low\n");
else if(temp==3)
System.out.print("\tWind\n Weak Strong\n");
double tsun=0;
for(int k=1;k<4;k++){
syes=0;sno=0;sun=0;over=0;ono=0;oyes=0;rain=0;ryes=0;rno=0;tsun=0;
for(i=0;i<14;i++){
if(table[i][0]==0){
tsun++;
if(table[i][k]==0){
sun++;
if(table[i][4]==1)
syes++;
else
sno++;
}
else
ono++;
}
if(table[i][k]==2){
rain++;
if(table[i][4]==1)
ryes++;
else
rno++;
}
}
}
double eover=45,esun=45,erain=45;
if(sno==0 || syes==0)
esun=0;
else
ono/over)/log2))+(-1*oyes/over*(Math.log(oyes/over)/log2));
if(rno==0 || ryes==0)
erain=0;
else
erain=(-1*rno/rain*(Math.log(rno/rain)/log2))+(-1*ryes/rain*(Math.log(ryes/rain)/log2));
//System.out.print(esun+" "+eover+" "+erain+"\n");
double avenout=(sun/tsun*esun)+(over/tsun*eover)+(rain/tsun*erain);
//System.out.print("Average Entropy: "+avenout+"\n");
double yes=syes+oyes+ryes;
double no=sno+ono+rno;
double es=(-1*no/tsun*(Math.log(no/tsun)/log2))+(-1*yes/tsun*(Math.log(yes/tsun)/log2));
gain[k]=es-avenout;
//System.out.print(" Information Gain: "+gain[k]+"\n");
}
max=0;temp=0;
for(i=1;i<4;i++){
if(max<gain[i]){
max=gain[i];
temp=i;
}
}
if(temp==1)
System.out.print("Temperature");
else if(temp==2)
System.out.print("Humidity");
else if(temp==3)
System.out.print("Wind");
for(int k=1;k<4;k=k+2){
syes=0;sno=0;sun=0;over=0;ono=0;oyes=0;rain=0;ryes=0;rno=0;tsun=0;
for(i=0;i<14;i++){
if(table[i][0]==2){
tsun++;
if(table[i][k]==0){
sun++;
if(table[i][4]==1)
syes++;
else
sno++;
}
if(table[i][k]==1){
over++;
}
if(table[i][k]==2){
rain++;
if(table[i][4]==1)
ryes++;
else
rno++;
}
}
}
double eover=45,esun=45,erain=45;
if(sno==0 || syes==0)
esun=0;
else
esun=(-1*sno/sun*(Math.log(sno/sun)/log2))+(-1*syes/sun*(Math.log(syes/sun)/log2));
if(ono==0 || oyes==0)
eover=0;
else
eover=(-1*ono/over*(Math.log(ono/over)/log2))+(-1*oyes/over*(Math.log(oyes/over)/log2));
if(rno==0 || ryes==0)
erain=0;
//System.out.print(esun+" "+eover+" "+erain+"\n");
double avenout=(sun/tsun*esun)+(over/tsun*eover)+(rain/tsun*erain);
//System.out.print("Average Entropy: "+avenout+"\n");
double yes=syes+oyes+ryes;
double no=sno+ono+rno;
gain[k]=es-avenout;
//System.out.print(" Information Gain: "+gain[k]+"\n");
}
if(temp==1)
System.out.print("\t\tTemperature\n");
else if(temp==3)
System.out.print("\t\tWind\n");
}
}