10-01-2008
program to calculate distance between 5 atoms
Hello,
I am a beginner with perl. I have a perl program to calculate the distance between 5 atoms or more.
i have an array which looks like this:
6.324 32.707 50.379
5.197 32.618 46.826
4.020 36.132 46.259
7.131 38.210 45.919
6.719 38.935 42.270
2.986 39.221 41.892
-0.269 37.184 41.565
I want to assign these values with Xi(column 1), Yi(column 2)and Zi(column 3). Suppose the first row values are (Xi,Yi,Zi), then the second row values will be (Xj, Yj, Zj) I want to calculate the distance using the formula
$dist = sqrt(($Xi-$Xj)**2+($Yi-$Yj)**2+($Zi-$Zj)**2) between row1/row2, row1/row3, row1/row4 ......so on.... till row6/row7
so its an iterative calculation. probably i shud us a for loop, and another forloop within the previous for loop. i am totally stuck.
till now my perl program looks like this:
open(IN, "/Users/anu/out.pl") or die "$!";
while (my $line = <IN>) {
chomp($line);
my @array = (split (/\s+/, $line))[6, 7, 8];
print "@array\n";
}
close(IN);
I dnt know wat to do..please help
Thank you
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LEARN ABOUT PHP
dbase_get_header_info
DBASE_GET_HEADER_INFO(3) 1 DBASE_GET_HEADER_INFO(3)
dbase_get_header_info - Gets the header info of a database
SYNOPSIS
array dbase_get_header_info (int $dbase_identifier)
DESCRIPTION
Returns information on the column structure of the given database link identifier.
PARAMETERS
o $dbase_identifier
- The database link identifier, returned by dbase_open(3) or dbase_create(3).
RETURN VALUES
An indexed array with an entry for each column in the database. The array index starts at 0.
Each array element contains an associative array of column information, as described here:
o name
- The name of the column
o type
- The human-readable name for the dbase type of the column (i.e. date, boolean, etc.)
o length
- The number of bytes this column can hold
o precision
- The number of digits of decimal precision for the column
o format
- A suggested printf(3) format specifier for the column
o offset
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If the database header information cannot be read, FALSE is returned.
EXAMPLES
Example #1
Showing header information for a dBase database file
<?php
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$db_path = "/tmp/test.dbf";
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PHP Documentation Group DBASE_GET_HEADER_INFO(3)