Problem with getting awk to multiply a field by a value set based on condition of another field


 
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# 15  
Old 02-03-2020
Quote:
Originally Posted by cotilloe
Wow, very simple. But why wouldn't it work the way I was trying? (Using an if/else block)
Difficult to say without in depth analysis. Guessing from a first peek: You got the blocks mixed up. The grade can only be determined when all results are summed up, i.e. in the END section.
And, you're testing too many conditions. Once the average IS NOT greater than or equal, it is automatically less, and the test can go.



Quote:
What does the 'R' represent in the second arg for the function?
Residual of former test - can go away.


How about
Code:
awk '
BEGIN           {split ("97 94 90 87 84 80 76 70 60 0", THRSH)
                 split ("A+ A  A- B+ B  B- C+ C  D  E", TMPGR)
                }
function GRD(AVG,   i)  {while ((AVG < THRSH[++i]) && (i < 11)) ;
                         return TMPGR[i]
                        }


FNR==NR         {WEIGHT[$1] = $3
                 next
                }
FNR == 1        {next
                }
                {SUM[$1]    += $4 * WEIGHT[$2]
                 TOT[$2,$3] += $5 * WEIGHT[$2]
                 CNT[$2,$3]++
                }
END             {for (t in TOT) TOTAL += TOT[t] / CNT[t]
                 for (s in SUM) {AVG = SUM[s] / TOTAL * 100 
                                 print s, SUM[s], AVG, GRD(AVG)
                                }
                }
' OFS="\t" OFMT="%.2f" file1 file2
Sam        349.45    60.75    D
Chelsey    536.95    93.34    A-
Andrew     402.60    69.99    D
Shane      427.75    74.36    C
Ava        434.50    75.53    C

Not sure if the algorithm to determine the TOTAL possible is reliable in other contexts - it takes the average per assignment of the participants thus ruling out students have missed an exam.
# 16  
Old 02-08-2020
I did not see your reply with the alternate code. Thanks for that. As far as the "algorithm", lol, there really is nothing more to it. The actual file does not contain student grade data but it does have names, categories and title and then a numerical column which needs to be averaged for all titles and then a string value given based on avg per name, as you have helped me with here.

I actually have another issue. Posting it here for reference but will start a new thread and give a bit of back story on it, but I need to do the same EXACT thing, only now in Perl.... Like I said, I will explain more in a new thread, so this one can be closed properly.
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