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Top Forums Shell Programming and Scripting Extract info and do algebra on it by sed or awk Post 302766267 by hayreter on Monday 4th of February 2013 01:04:09 PM
Old 02-04-2013
Extract info and do algebra on it by sed or awk

Hello everyone,
I need to extract some information from a csv file and further need to do some algebraic calculations on those information and then to throw the result in a new file.
Here is a sample from my data.csv file;
Code:
Col1,Col2,Col3,Col4,Col5,Col6,Col7
a,3,501,0.75E+03,0.62E+02,0.27E-01,0.33E+01
b,5,502,0.58E+02,0.44E+01,0.79E+03,0.93E-01

What I need to do is the following;
If Col1 in a row has a value "a" and if Col1 in the NEXT row has value "b" calculate
Sqrt{(Col4 on 1st row + Col4 on the next row)^2 +
(Col5 on 1st row + Col5 on the next row)^2 +
(Col6 on 1st row + Col6 on the next row)^2 +
(Col7 on 1st row + Col7 on the next row)^2}
then the result should be written in a new file on a column.

Thanks a lot, let me know if you need any other information.

Any help will be highly appreciated.
 

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MYSQL_FETCH_ROW(3)							 1							MYSQL_FETCH_ROW(3)

mysql_fetch_row - Get a result row as an enumerated array

SYNOPSIS
Warning This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include: omysqli_fetch_row(3) o PDOStatement::fetch array mysql_fetch_row (resource $result) DESCRIPTION
Returns a numerical array that corresponds to the fetched row and moves the internal data pointer ahead. o $ result -The result resource that is being evaluated. This result comes from a call to mysql_query(3). Returns an numerical array of strings that corresponds to the fetched row, or FALSE if there are no more rows. mysql_fetch_row(3) fetches one row of data from the result associated with the specified result identifier. The row is returned as an array. Each result column is stored in an array offset, starting at offset 0. Example #1 Fetching one row with mysql_fetch_row(3) <?php $result = mysql_query("SELECT id,email FROM people WHERE id = '42'"); if (!$result) { echo 'Could not run query: ' . mysql_error(); exit; } $row = mysql_fetch_row($result); echo $row[0]; // 42 echo $row[1]; // the email value ?> Note This function sets NULL fields to the PHP NULL value. mysql_fetch_array(3), mysql_fetch_assoc(3), mysql_fetch_object(3), mysql_data_seek(3), mysql_fetch_lengths(3), mysql_result(3). PHP Documentation Group MYSQL_FETCH_ROW(3)
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