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Homework and Emergencies Homework & Coursework Questions Helpm with time function
# 1  
Old 12-23-2016
Helpm with time function
I want to print the difference (in days) between ($7) and the oldest record date ($6) based on unique ID ($5) on a new field. In addition, I want to subtract oldest date from recent dates(in days) ($6) for each unique ID ($5).

Here is the data looks like
Code:
 7  81  1    47  32070  2010-12-14    20101009  
 7  82  2    10  41920  2010-12-14    20100724  
 7  83  1    67  29446  2010-12-14    20101118   
 7  81  1    47  32070  2011-5-11     20101009     
 7  83  1    67  29446  2011-6-22     20101118     
 7  82  2    10  41920  2011-5-14     20100724

I would like to see as follows
Code:
 7  81  1    47  32070   2010-12-14   20101009     65      147    
 7  82  2    10  41920   2010-12-14   20100724     170     150  
 7  83  1    67  29446   2010-12-14   20101118     26      188  
 7  81  1    47  32070   2011-5-11    20101009      65      147  
 7  83  1    67  29446   2011-6-22    20101118      26      188  
 7  82  2    10  41920   2011-5-14    20100724      170     150​

I have used the following code but doesnt work well. could you help me please.


Code:
BEGIN{
  lastid=0
  lastmilk=0
}
{
   milkyear=substr($6,1,4)
  milkmonth=substr($6,5,2)
  milkday=substr($6,7,2)
  
  startmilksec = mktime(""milkyear" "milkmonth" "milkday"  00")
  endmilk = mktime(""milkyear" "milkmonth" "milkday" 00")
   if(lastid!=$5) 
  {
    printf("%s 0 0 0\n", $0) 
  }
  else
  {
    startmilkdiff=startmilk-lastmilk
    printf("%s %0.f %f %f\n", $0, startmilkdiff) # 
  }
   lastid=$5
  lastmilk=startmilk
}



Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!
Last edited by RudiC; 12-23-2016 at 12:04 PM.. Reason: Added CODE tags.
# 2  
Old 12-23-2016
Quote:
...code but doesnt work well.
Sadly, the above doesn't help us diagnose it very well. What output/errors do you get?
Can you get any trace output from/after the mktime function? I think that the date input to mktime is actually a string in the format YYYY MM DD HH MM SS and you don't have all of it, hence I'm wondering if that's where it's going wrong. There is also confusion about all the double quotes.

I also don't see where you are trying to output the days as days. You are displaying the output as the raw difference between two timestamps, which we don't know if they are formatted correctly.

Can you add some printf statements into your code and show us the output from a single input record?



Kind regards,
Robin
# 3  
Old 12-23-2016
Your specification is not too clear, and the code doesn't help understanding nor interpreting .
It is always beneficial to show WHAT exactly "doesn't work well". A few comments that jump to mind looking at your code :
- where is $7 used for computations?
- milkmonth and milkday will not have correct values as the substr parameters are wrong and could be moving.
- lastmilk is undefined for the first line, and not reset if $5 changes. This may be intended behaviour, though.
- endmilk is never used; why not drop it entirely?
- as startmilkdiff is the only variable in the printf stament, three %f format specifiers are redundant.
- as correspondent $5 values are NOT in sequence, you'd better work with arrays, or do a sort beforehand.

EDIT:
- plus, the mktime function requires 6 or 7 parameters; you supply 4 only.
- you want to output the difference in days, but calculate and print second values only.
Last edited by RudiC; 12-23-2016 at 01:15 PM..
# 4  
Old 12-23-2016
the data has a repeated record on different days for the same Id [$5] and i want to print the difference between the oldest and recent record date (in days) [$6] for each unique ID on separate field. In addition, i want to print separately also the difference between field [$7] (which is a date) and the oldest record date of field [$6] for each unique ID. I am struggling to write the command. could you help me in writting the script please.
# 5  
Old 12-24-2016
Want help? Show us your output as your code now produces please.
# 6  
Old 12-24-2016
I need to print the difference (in days) in ($6) between the starting and end date of records for each unique ID ($5) on a new field.

[
Code:
 7  65  2    5   32070  2010-12-14    13:25:30  
 7  82  2    10  41920  2010-12-14    11:30:45
 7  83  1    67  29446  2010-12-14    04:15:25  
 7  81  1    47  32070  2011-5-11      08:14:20
 7  83  1    67  29446  2011-6-22      07:13:24    
 7  82  2    10  41920  2011-5-14      06:15:25

]

I want to see like this:
code:
[
Code:
 7  65  2    5   32070   2010-12-14      13:25:30      65     
 7  82  2    10  41920   2010-12-14      11:30:45     170  
 7  83  1    67  29446   2010-12-14       04:15:25    26   
 7  81  1    47  32070   2011-5-11         08:14:20    65    
 7  83  1    67  29446   2011-6-22         07:13:24    26   
 7  82  2    10  41920   2011-5-14          06:15:25   70

]
Last edited by Scrutinizer; 12-24-2016 at 02:50 PM.. Reason: code tags
# 7  
Old 12-25-2016
This is some awk code. Because you wanted to add days to lines where it could not be calculated, this code is two awk scripts in one bash script. It could be cleaned up.
It adds -1 to lines in error, error being a singleton line.
Code:
$ cat filename && ./t.awk
7  65  2    5   32070  2010-12-14    13:25:30
7  82  2    10  41920  2010-12-14    11:30:45
7  83  1    67  29446  2010-12-14    04:15:25
7  81  1    47  32070  2011-5-11      08:14:20
7  83  1    67  29446  2011-6-22      07:13:24
7  82  2    10  41920  2011-5-14      06:15:25
7  82  2    10  41921  2011-5-14      06:15:25

7  65  2    5   32070  2010-12-14    13:25:30   147
7  82  2    10  41920  2010-12-14    11:30:45 150
7  83  1    67  29446  2010-12-14    04:15:25   189
7  81  1    47  32070  2011-5-11      08:14:20 147
7  83  1    67  29446  2011-6-22      07:13:24     189
7  82  2    10  41920  2011-5-14      06:15:25 150
7  82  2    10  41921  2011-5-14      06:15:25 -1

Code:
# 7  82  2    10  41920  2011-5-14      06:15:25


awk '{
       split($6,arr,"-")
       a=sprintf("%s %s %s 0 0 0",arr[1], arr[2], arr[3])
       d=mktime(a)
       # this is to handle the fact that you want the same data early and late 
       # in the output
       delta[$5]=delta[$5] " " d
     } 
     END {for(i in delta) {print i, delta[i]}  }'  filename > tmp.dat

#    
# display output, print error "-1" if each $5 does not occur twice in the input file
awk '{
      if (FILENAME=="tmp.dat" )
      { 
        delta[$1]=$0; 
        next
      }
      if (FILENAME=="filename")
      { 
        a="-1"  # default is error
        if($5 in delta)
        {
           cnt=split(delta[$5],arr)
           if(cnt==3) # correct number, 1 for $5 two & three are epoch seconds
           {
             a=arr[3] - arr[2]
             a/=86400
             a=int(a)
           }
        }
        print $0, a      
        next
      }
    }' tmp.dat filename   
# note the order of files here is important

This User Gave Thanks to jim mcnamara For This Post:
RavinderSingh13
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