I am beginner in perl. I am reading word pairs from text file in [['treatments', 'sunlight'], ['treatments', 'help'],...] format. I am reading it using perl .But after doing lot of pre-processing so that $umls->getConceptList($t1); get string .But its still showing same error.Dont know what is wrong with syntax or is there something else i m missing... 

#**************problem in below line****
my $cu1 = $umls->getConceptList($t1);

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(Instead of passing $t1="$w[0]",$t2="$w[1]" if I pass string like $t1="Medicine",$t2= "head" directly then it works perfectly fine. Dont know whats problem with assignment of $t1,$t2. Please help me to resolve it..... 

******CODE**************

for(my $i=0;$i<$n_size;$i++){
      my  @w= split(/,/ , $new[$i]);
     
      $w[0]=~s/\'//;  #pre-process to remove ' from text 
      $w[0]=~s/\'//;    as @w='word1' 'word2'
      $w[1]=~s/\'//;  
      $w[1]=~s/\'//; 
      
      
      my $t1 = "$w[0]";  #$w[0]=word1  without single quotes
      my $t2 = "$w[1]";  #$w[1]=word2
     
      print $t1,$t2,"__________";   #working
      
     my $cu1 = $umls->getConceptList($t1); #calling function from umls
+::similarity #ERRRO 1 as mentioned
      my $cui1 =pop @{$cu1};
      my $cu2 = $umls->getConceptList($t2);***error
      my $cui2 = pop @{$cu2};
      print $cui1;    # ****ERROR2 unintialized $cui1
      my $lvalue = $lch->getRelatedness($cui1, $cui2); 
      my $value = $path->getRelatedness($cui1, $cui2);

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In reply to Use of uninitialized value $cui1 in print by Raksha Jalan

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