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Perl Array help

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# 15  
Old 05-25-2012
uname -a
Code:
wyncc 2.6.34-12-desktop #1 SMP PREEMP 2010-06-29 02:39:08 +0200 x86_64 x86_64 x86_64 GNU/Linux

echo $SHELL
Code:
/bin/tcsh

and i got it to work.

i wast aware that the inputs where to be entered right after the test.pl

if you don't mind i would just kind of like to clarify some of the code to get a better understand of what each line is doing.

This segment is searching through the "input" file for the data between *NODE and * correct? and if it finds *NODE it wants all the data on the next line until the data just above *?
Code:
while (<COORD>) {
    chomp;
    if (/^\*NODE/ .. /^\*\*/) {
        if (/^\*NODE/) { next }
        if (/^\*\*/)   { last }


as for the next two lines i have absolutely no idea what they are doing.
Code:
@nos = split /\s+/;
        @nos = map { s/[.,]+$//; $_ } @nos;

Thanks!
# 16  
Old 05-25-2012
Quote:
Originally Posted by dets34
This segment is searching through the "input" file for the data between *NODE and * correct? and if it finds *NODE it wants all the data on the next line until the data just above *?
Code:
while (<COORD>) {
    chomp;
    if (/^\*NODE/ .. /^\*\*/) {
        if (/^\*NODE/) { next }
        if (/^\*\*/)   { last }

Yes, you're right.

Quote:
Originally Posted by dets34
as for the next two lines i have absolutely no idea what they are doing.
Code:
@nos = split /\s+/;
        @nos = map { s/[.,]+$//; $_ } @nos;

Thanks!
@nos = split /\s+/; => Split the line using whitespaces as delimiter and store the elements in array @nos

@nos = map { s/[.,]+$//; $_ } @nos => s/// is similar to sed's substitution. This is the general format: s/<pattern>/<replacement>/modifiers. So string matched by <pattern> is substituted by <replacement>. What we're doing here is, take each element of array @nos and delete last characters if they're a '.' or ',' (or rather substitute . or , by nothing). After this task take the elements and store them back in array @nos
# 17  
Old 05-25-2012
Next question:

This line is checking to see if near_dist is defined and if it's defined it sets near_dist = dist
Code:
if (!defined($near_dist)) {
            $near_dist = $dist;
        }


as for this next line im not to sure whats happening
Code:
elsif ($dist <= $near_dist) {
            $near_dist = $dist;
            @near_node = @nos;

---------- Post updated at 12:48 PM ---------- Previous update was at 12:25 PM ----------

also when i enter a negative value for a node position it gives me the incorrect node that is closest. Is there away to allow negative positions???????

---------- Post updated at 01:10 PM ---------- Previous update was at 12:48 PM ----------

im also getting
Use of uninitialized value in subtraction (-) for i believe every line data
# 18  
Old 05-29-2012
here is the data containing the negative coordinates.
GM_RWD_1046gm_10mmCLEARANCE.txt (2.24 MB) 
# 19  
Old 05-29-2012
The format of the file attached in post #18 has changed. Your original requirement was to loop through the data co-ordinates which are in between "*NODE" and "**". And this data in between had few white spaces at the beginning of each line.

Since the data format provided now has changed, the program is not going into the if-condition block inside the while loop.

Try with this exact data sample (this is similar to your original requirement):
Code:
Random Text
Random Text
Random Text
*NODE
    70000000,        2536.143099644908,       -228.1225513919157,                 776.3626
    70000001,        2537.780882406166,      -224.58895334736727,                 776.3626
    70000002,                 2532.735,                  -224.66,                 776.3626
    70000003,                 2532.735,                 -227.938,                 776.3626
    70000004,       2511.7897270833937,                 -224.514,                 776.3626
    70000005,                 2506.435,                 -224.514,                 776.3626
    70000006,        2506.441591494802,      -227.63505426366342,                 776.3626
    70000007,        2512.065925587347,      -227.04047758786248,                 776.3626
    70000008,       2506.7046700485685,      -231.10340020092286,                 776.3626
    70000009,       2512.6415277961746,      -229.46730220429106,                 776.3626
    70000010,        2520.966873352281,         -238.49470282806,                 776.3626
**
Random Text
Random Text
Random Text

Code:
[user@host ~]# ./test.pl 2532 -228 776
Nearest node: 70000003 2532.735 -227.938 776.3626
Distance: 0.821917124776105
[user@host ~]#

Also, I've made a small modification in the code after line #24 (added line "@near_node = @nos" as line #25. This will help to display the node data incase the match is obtained in the very first line).
Last edited by balajesuri; 05-29-2012 at 09:59 AM..
# 20  
Old 05-29-2012
im still pulling data from the *NODE to **. I had the code put the data into a .txt file just for quick reference.
# 21  
Old 05-29-2012
Are you able to run the program successfully for data sample in post #19?

I see that the file format in post #18 is Macintosh. If you've transferred this file (in mac format) to unix or windows, then the perl program would not be able to process the file.
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