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Array pairwise matching in java give error also store data between two similar element

I have two array. They are represent x-coordinates and y-coordinates. The code is like that if both coordinates are same it print a statement "Both co ordinates are same" else they print They are not same.

My code is

public static void main(String args){
doublexcoordinate=2.3,1.2,3.3,5.5,2.3,1.3,7.9,1.2,3.3,3.3,5.2;
doubleycordinate=5.4,2.2,4.4,6.6,5.4,1.9,5.2,2.2,3.5,4.4,4.2;
int i=0,k=1;
while(i<xcoordinate.length)
//if(xcoordinate[i]&&ycordinate[i]==xcoordinate[k]&&ycordinate[k])
if(xcoordinate[i]==xcoordinate[k]&&ycordinate[i]==ycordinate[k])
System.out.println("Both co ordinates are same");
i++;
if(k<xcoordinate.length)
k = i + 1;



else
System.out.println("They are not same");

k++;




If I analysis the array I can see that 2.3 and 5.4 are pair,1.2 and 2.2 are pair and so on. As you can see 2.3 and 5.4 is repeat at 5th pair. So in this time they print They are same.

But the code block not run for that if statement.

Error: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 11

How to eliminate this error and also how to store the They are not same types of data?

Like want to store 1.2,3.3,5.5and2.2,4.4,6.6 and 3.3,5.5,2.3,1.3,7.9and4.4,6.6,5.4,1.9,5.2 ..... separately.

if(xcoordinate[i] == ycordinate[i] && xcoordinate[k] == ycordinate[k])

4 Answers
4

Apart from the answer from Simion who is solving your evaluation problem, will you end up having an enless loop, cause you only increment i (i++) when your numbers are the same.

I believe you are trying to keep track of repeating co-ordinates,
If yes, then this might help!

int i=0;
HashMap<Double,Double> hst = new HashMap<Double,Double>();
while(i<xcoordinate.length)

if(hst.containsKey(xcoordinate[i]))
if(hst.get(xcoordinate[i]) == ycordinate[i])
System.out.println("Occured before and now again at pos" +i);
i++;
continue;


System.out.println("Not occured before");
hst.put(xcoordinate[i],ycordinate[i]);
i++;



You need to change, you have a syntax error:

if((xcoordinate[i]==xcoordinate[k])&&(ycordinate[i]==ycordinate[k]))


If expressions don't evaluate as you coded.

EDIT 2: Here is the full workable code:

public static void main(String args)
doublexcoordinate=2.3,1.2,3.3,5.5,2.3,1.3,7.9,1.2,3.3,3.3,5.2;
doubleycordinate=5.4,2.2,4.4,6.6,5.4,1.9,5.2,2.2,3.5,4.4,4.2;
for(int i = 0; i < xcoordinate.length; i++)
for(int k = i+1; k < xcoordinate.length; k++)
if(xcoordinate[i]==xcoordinate[k]&&ycordinate[i]==ycordinate[k])
System.out.println("Both co ordinates are same: " + i + "," + k);

else
System.out.println("They are not same" + i + " " + k);




EDIT 3: The same functionality, using while loops, the correct way of doing:

public static void main(String args)
doublexcoordinate=2.3,1.2,3.3,5.5,2.3,1.3,7.9,1.2,3.3,3.3,5.2;
doubleycordinate=5.4,2.2,4.4,6.6,5.4,1.9,5.2,2.2,3.5,4.4,4.2;
int i = 0;
while(i < xcoordinate.length)

int k = i+1;
while(k < xcoordinate.length)

if(xcoordinate[i]==xcoordinate[k]&&ycordinate[i]==ycordinate[k])
System.out.println("Both co ordinates are same: " + i + "," + k);

else
System.out.println("They are not same" + i + " " + k);

k++;

i++;




!Edited to match new requirements

This code prints out where the coordinates are pairwise matched

public class Arraypairmatching

public static void main(String args)

doublexcoordinate=2.3,1.2,3.3,5.5,2.3,1.3,7.9,1.2,3.3,3.3,5.2;
doubleycoordinate=5.4,2.2,4.4,6.6,5.4,1.9,5.2,2.2,3.5,4.4,4.2;

double repeatedx = new double[xcoordinate.length];
double repeatedy = new double[ycoordinate.length];

int k=0;

for(int i=0;i<xcoordinate.length-1;i++)

double xcoordinate1 = xcoordinate[i];
double ycoordinate1=ycoordinate[i];
for(int j=i+1;j<xcoordinate.length;j++)

double xcoordinate2 = xcoordinate[j];
double ycoordinate2=ycoordinate[j];
if((xcoordinate1==xcoordinate2) && (ycoordinate1==ycoordinate2))

System.out.println("same pair repeated at index "+i+" and "+j+" index");
repeatedx[k]=xcoordinate[i];
repeatedy[k]=ycoordinate[i];
k++;





//to print the repeated x values
System.out.print("repeated x values ");
for(int l=0;l<k;l++)

System.out.print(repeatedx[l]+" ");

//to print the repeated y values
System.out.print("repeated y values ");
for(int m=0;m<k;m++)

System.out.print(repeatedy[m]+" ");





Output-

same pair repeated at index 0 and 4 index
same pair repeated at index 1 and 7 index
same pair repeated at index 2 and 9 index
repeated x values 2.3 1.2 3.3 repeated y values 5.4 2.2 4.4


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