[H-GEN] one for an awk guru

[Michael Dooley]

Hi All,
            Here's something strange I've seen with awk and nawk a
couple of time now.  In this case I'm finding lines from headers of
files where $1 is SSBOND and creating an array of $4's and $6's.  Here's
some sample lines:

SSBOND   1  CYS      9    CYS     47
1IGL 366
SSBOND   2  CYS     21    CYS     60
1IGL 367
SSBOND   3  CYS     46    CYS     51
1IGL 368

This is the script I've written:

nawk ' BEGIN {i=1;m=1}
$1 ~ /SSBOND/{cysteine[i] = $4;i++;cysteine[i] = $6;i++}
END {for (m in cysteine)
                printf "%s\n",cysteine[m]}
' $1

Strangely, instead of the output:
9
47
21
60
46
51

I get:

47
21
60
46
51
9

If I use the alternative 'for' definition : for (m=1;m<=x;m++), I get
the output I want.  However x will vary from file to file so I'd rather
use the array specification of for.

Is this a case of the script giving me what I ask for, not what I want
(??!!) any ideas?
Cheers
Michael

--
Michael Dooley PhD
Centre for Drug Design and Development
The University of Queensland
Brisbane Qld 4072 Australia
m.dooley at mailbox.uq.edu.au


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