Problem with looping.

rina · #1 04-Oct-2005, 00:47

Hi all.
I am having a problem with my loop.
I need anyone here explain to me whats going on with the code below.

Input euc_total[cluster][i]:
1.0000 0.0000 2.8284 4.2426
5.0000 4.2426 1.4142 0.0000

CPP / C++ / C Code:

void Get_Min_Distance()
{
	int clust = 0, doc = 0, doc_cluster = 0, doc_count = 0;
	double min = 0.0;

	for (int i = 0; i < ROW; i ++ )
	{
		min = euc_total[0][i];
		for (int cluster = 0; cluster < cluster_num; cluster++)
		{
			if (euc_total[cluster][i] < min)
			{	
				min = euc_total[cluster][i];
                                clust = cluster;
				printf("\nmin= %.4f cluster=%d",min,cluster);//1
                         }					
		}
        printf("\n%.4f -> Document [%d] in cluster [%d]", min, i, clust);//2
        }
}

In the function above, I have 2 printf.
The first printf will display the "min" value and "cluster" value.
The problem is, it will display cluster 1 only, and I am wondering why it doesnt display starting with cluster 0.

Output:
min= 1.4142 cluster=1
min= 0.0000 cluster=1

The second printf has no such problem. It displays starting from cluster 0.

Output:
1.0000 -> Document [0] in cluster [0]
0.0000 -> Document [1] in cluster [0]
1.4142 -> Document [2] in cluster [1]
0.0000 -> Document [3] in cluster [1]

I am thinking why the first printf cant display cluster starting with 0 while the second printf can do that??

Anyone..pls explain.
And how to solve this problem.

Thanks in advance.

cybemulatorC++ · #2 04-Oct-2005, 04:13

Is this a full code or part. Many things are undeclared like ROW,euc_total etc... And didn't understand a thing.

Paramesh · #3 04-Oct-2005, 06:37

hi...

you assigned min as:

Quote:

min = euc_total[0][i];

so if you check

Quote:

euc_total[cluster][i] < min

that will be always false...
can you understand?
so everytime, only when the cluster goes above 1, there is a chance for the condition inside the if statement to be true.
only if the condition in the if statement is true, the value of cluster will be assigned to clust...
else the value of clust will be zero..
so there is a chance that your second printf can print the cluster to be zero..

may be you can post your full code and tell what you need.. because i dont understand your program completely...

i compiled the following the program(same as yours)

CPP / C++ / C Code:

#include<stdio.h>
int main()
{
int clust = 0, doc = 0, doc_cluster = 0, doc_count = 0;

double min = 0.0;

int cluster_num = 5 , ROW = 5;                        //just to check all the values....

double euc_total[2][4]={  { 1.0000 , 0.0000 , 2.8284 , 4.2426 },
                                   {5.0000 , 4.2426 , 1.4142 , 0.0000 } };
for (int i = 0; i < ROW; i ++ )
 { 
    min = euc_total[0][i];
    for (int cluster = 0; cluster < cluster_num; cluster++)
    {
        if (euc_total[cluster][i] < min)
        {
            min = euc_total[cluster][i];
            clust = cluster;
            printf("\n min= %.4f  cluster=%d" , min , cluster);
        }
    }
    printf("\n %.4f -> Document [%d] in cluster [%d]" ,  min ,  i ,  clust );
 }
return 0;
}

but i got the result as:

Quote:

min=0.0000 cluster=2
0.0000 -> Document [0] in cluster [2]
0.0000 -> Document [1] in cluster [2]
min=1.4142 cluster=1
min=0.0000 cluster=2
0.0000 -> Document [2] in cluster [2]
min=0.0000 cluster=1
0.0000 -> Document [3] in cluster [1]
min=0.0000 cluster=1
0.0000 -> Document [4] in cluster [1]

did you see that? the value of clust is always the same of the cluster as you assigned clust=cluster....
else the value of clust will be the same as the one in your previous loop..
you can also check your program by giving different values of euc_total...

bye...
Paramesh

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Problem with looping.

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Re: Problem with looping.