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Printing ten values from each array alternating between them until both are empty

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1

Suppose I have the following script and it is iterating over two arrays and prints the the values alternating between them. I feed the Script the following file:

1 2
1 2
1 2
1 2
1 2
1 2

Awk Script:

BEGIN FS = "t" 
 a[o++]=$1; b[c++]=$2 
END while (++co <= 5 ) 
 for ( k = 1+count; k <= 2+count; k++ ) if (length(a) >= 0) print a[k]; delete a[k] 
 for ( ki = 1+count; ki <= 2+count; ki++ ) if (length(b) >= 0) print b[ki]; delete b[ki] 
 count = k
 

And I expect the output to be

1
1
2
2
1
1
2
2
1
1
2
2

But what I get is:

1
1
2
2
1
1
2
2

(followed by blank lines but they are not my issue)

So how to make it run until both arrays are empty and everything is printed. And how to make it work even if the arrays are of different size e.g. one caontains for example 20 more values than the other. So then just these values should be printed until the array is empty.

linux awk

share|improve this question

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you adhere to the MCVE principle, you will receive better answers. My guess is that your code is failing because you delete elements 1-10 and then continue referring to them
  
  – Thor
  Mar 25 at 11:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Soory that this is not fully complete but it is part of a real big script. But your suggestion makes sense to me and I see the error now. Let me try something and then I either rewrite the question or I close it. Thank you.
  
  – JFS31
  Mar 25 at 11:30
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hope its better now :)
  
  – JFS31
  Mar 25 at 11:56
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  awk arrays are one-indexed. Where you collect data into a and b, you write the first data to a[0] and b[0] which are never printed
  
  – Thor
  Mar 25 at 12:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Thor Very good point. I overlooked that. Thank you :)
  
  – JFS31
  Mar 25 at 13:25
  

  
  
  
  

 | 
show 2 more comments

1

Suppose I have the following script and it is iterating over two arrays and prints the the values alternating between them. I feed the Script the following file:

1 2
1 2
1 2
1 2
1 2
1 2

Awk Script:

BEGIN FS = "t" 
 a[o++]=$1; b[c++]=$2 
END while (++co <= 5 ) 
 for ( k = 1+count; k <= 2+count; k++ ) if (length(a) >= 0) print a[k]; delete a[k] 
 for ( ki = 1+count; ki <= 2+count; ki++ ) if (length(b) >= 0) print b[ki]; delete b[ki] 
 count = k
 

And I expect the output to be

1
1
2
2
1
1
2
2
1
1
2
2

But what I get is:

1
1
2
2
1
1
2
2

(followed by blank lines but they are not my issue)

So how to make it run until both arrays are empty and everything is printed. And how to make it work even if the arrays are of different size e.g. one caontains for example 20 more values than the other. So then just these values should be printed until the array is empty.

linux awk

share|improve this question

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you adhere to the MCVE principle, you will receive better answers. My guess is that your code is failing because you delete elements 1-10 and then continue referring to them
  
  – Thor
  Mar 25 at 11:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Soory that this is not fully complete but it is part of a real big script. But your suggestion makes sense to me and I see the error now. Let me try something and then I either rewrite the question or I close it. Thank you.
  
  – JFS31
  Mar 25 at 11:30
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hope its better now :)
  
  – JFS31
  Mar 25 at 11:56
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  awk arrays are one-indexed. Where you collect data into a and b, you write the first data to a[0] and b[0] which are never printed
  
  – Thor
  Mar 25 at 12:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Thor Very good point. I overlooked that. Thank you :)
  
  – JFS31
  Mar 25 at 13:25
  

  
  
  
  

 | 
show 2 more comments

Suppose I have the following script and it is iterating over two arrays and prints the the values alternating between them. I feed the Script the following file:

1 2
1 2
1 2
1 2
1 2
1 2

Awk Script:

BEGIN FS = "t" 
 a[o++]=$1; b[c++]=$2 
END while (++co <= 5 ) 
 for ( k = 1+count; k <= 2+count; k++ ) if (length(a) >= 0) print a[k]; delete a[k] 
 for ( ki = 1+count; ki <= 2+count; ki++ ) if (length(b) >= 0) print b[ki]; delete b[ki] 
 count = k
 

And I expect the output to be

1
1
2
2
1
1
2
2
1
1
2
2

But what I get is:

1
1
2
2
1
1
2
2

(followed by blank lines but they are not my issue)

So how to make it run until both arrays are empty and everything is printed. And how to make it work even if the arrays are of different size e.g. one caontains for example 20 more values than the other. So then just these values should be printed until the array is empty.

linux awk

share|improve this question

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

1 2
1 2
1 2
1 2
1 2
1 2

BEGIN FS = "t" 
 a[o++]=$1; b[c++]=$2 
END while (++co <= 5 ) 
 for ( k = 1+count; k <= 2+count; k++ ) if (length(a) >= 0) print a[k]; delete a[k] 
 for ( ki = 1+count; ki <= 2+count; ki++ ) if (length(b) >= 0) print b[ki]; delete b[ki] 
 count = k
 

1
1
2
2
1
1
2
2
1
1
2
2

1
1
2
2
1
1
2
2

(followed by blank lines but they are not my issue)

share|improve this question

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

share|improve this question

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

edited Mar 25 at 12:20

Thor

32k77 gold badges8585 silver badges9898 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

asked Mar 25 at 11:10

JFS31JFS31

45333 silver badges1313 bronze badges

1 Answer
1

active

oldest

votes

1

wrt how to make it run until both arrays are empty - There's no need to delete the array contents.

wrt just these values should be printed until the array is empty - "the array is empty" could mean print just the values at the indices present in both arrays ("the first array is empty") or it could mean print all the values from both arrays ("both arrays are empty"). The script below assumes the latter but is easily tweaked to do the former (change || to &&).

$ cat tst.awk
 a[++maxA]=$1; b[++maxB]=$2 
END (prevEnd<maxB) ) 
 prt(a)
 prevEnd = prt(b)
 


function prt(arr, idx) 
 for (idx=prevEnd+1; idx<=prevEnd+2; idx++) 
 if (idx in arr) 
 print arr[idx]
 
 
 return (idx-1)


$ awk -f tst.awk file
1
1
2
2
1
1
2
2
1
1
2
2

share|improve this answer

edited Mar 25 at 13:28

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, you are right with not deleting the content.
  
  – JFS31
  Mar 25 at 13:27
  

  
  
  
  

add a comment | 

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1

wrt how to make it run until both arrays are empty - There's no need to delete the array contents.

wrt just these values should be printed until the array is empty - "the array is empty" could mean print just the values at the indices present in both arrays ("the first array is empty") or it could mean print all the values from both arrays ("both arrays are empty"). The script below assumes the latter but is easily tweaked to do the former (change || to &&).

$ cat tst.awk
 a[++maxA]=$1; b[++maxB]=$2 
END (prevEnd<maxB) ) 
 prt(a)
 prevEnd = prt(b)
 


function prt(arr, idx) 
 for (idx=prevEnd+1; idx<=prevEnd+2; idx++) 
 if (idx in arr) 
 print arr[idx]
 
 
 return (idx-1)


$ awk -f tst.awk file
1
1
2
2
1
1
2
2
1
1
2
2

share|improve this answer

edited Mar 25 at 13:28

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, you are right with not deleting the content.
  
  – JFS31
  Mar 25 at 13:27
  

  
  
  
  

add a comment | 

1

wrt how to make it run until both arrays are empty - There's no need to delete the array contents.

wrt just these values should be printed until the array is empty - "the array is empty" could mean print just the values at the indices present in both arrays ("the first array is empty") or it could mean print all the values from both arrays ("both arrays are empty"). The script below assumes the latter but is easily tweaked to do the former (change || to &&).

$ cat tst.awk
 a[++maxA]=$1; b[++maxB]=$2 
END (prevEnd<maxB) ) 
 prt(a)
 prevEnd = prt(b)
 


function prt(arr, idx) 
 for (idx=prevEnd+1; idx<=prevEnd+2; idx++) 
 if (idx in arr) 
 print arr[idx]
 
 
 return (idx-1)


$ awk -f tst.awk file
1
1
2
2
1
1
2
2
1
1
2
2

share|improve this answer

edited Mar 25 at 13:28

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, you are right with not deleting the content.
  
  – JFS31
  Mar 25 at 13:27
  

  
  
  
  

add a comment | 

wrt how to make it run until both arrays are empty - There's no need to delete the array contents.

wrt just these values should be printed until the array is empty - "the array is empty" could mean print just the values at the indices present in both arrays ("the first array is empty") or it could mean print all the values from both arrays ("both arrays are empty"). The script below assumes the latter but is easily tweaked to do the former (change || to &&).

$ cat tst.awk
 a[++maxA]=$1; b[++maxB]=$2 
END (prevEnd<maxB) ) 
 prt(a)
 prevEnd = prt(b)
 


function prt(arr, idx) 
 for (idx=prevEnd+1; idx<=prevEnd+2; idx++) 
 if (idx in arr) 
 print arr[idx]
 
 
 return (idx-1)


$ awk -f tst.awk file
1
1
2
2
1
1
2
2
1
1
2
2

share|improve this answer

edited Mar 25 at 13:28

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges

$ cat tst.awk
 a[++maxA]=$1; b[++maxB]=$2 
END (prevEnd<maxB) ) 
 prt(a)
 prevEnd = prt(b)
 


function prt(arr, idx) 
 for (idx=prevEnd+1; idx<=prevEnd+2; idx++) 
 if (idx in arr) 
 print arr[idx]
 
 
 return (idx-1)


$ awk -f tst.awk file
1
1
2
2
1
1
2
2
1
1
2
2

share|improve this answer

edited Mar 25 at 13:28

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges

answered Mar 25 at 13:19

Ed MortonEd Morton

120k1313 gold badges4646 silver badges106106 bronze badges