01-10-2010
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
If I had a list of numbers in two different files, what would be the fastest and easiest way to find out which numbers in list B are not in list A without reading each number in list B one at a time and using grep thousands of times against list A?
I have two very long lists of numbers and the... (4 Replies)
Discussion started by: keelba
4 Replies
2. UNIX for Dummies Questions & Answers
Hi ,
I have a peculiar case, where my sed command is working on a file which contains lines of small length.
sed "s/XYZ:1/XYZ:3/g" abc.txt > xyz.txt
when abc.txt contains lines of small length(currently around 80 chars) , this sed command is working fine.
when abc.txt contains lines of... (3 Replies)
Discussion started by: thanuman
3 Replies
3. UNIX for Dummies Questions & Answers
hello all,
I wonder if anybody might be able to help with this.
I have file 1 and file2.
Both files may contain thousands of lines that have variable contents.
file1
234GH
5234BTW
89er
678tfg
234
234YT
tfg456
wert
78gt
gh23444 (7 Replies)
Discussion started by: Garrred
7 Replies
4. Shell Programming and Scripting
The following bash script does not work because the java/groovy code always thinks there are four arguments even if there are only 1 or 2. As you can see from my hideous backslashes, I am using cygwin bash on windows.
export... (1 Reply)
Discussion started by: siegfried
1 Replies
5. Programming
Hi.
I am trying to write a Python programme that compares two different text files which both contain a list of words. Each word has its own line
worda
wordb
wordc
I want to compare textfile 2 with textfile 1, and if there's a word in textfile 2 that is NOT in textfile 1, I want to... (6 Replies)
Discussion started by: Bloomy
6 Replies
6. Shell Programming and Scripting
hi,
I have 2 large lists:
LIST A: containes 6 fields of many entries (VARIABLE number), like:
2011-07-10 | 18:19:47 | 38037300 | 9647808003122 | 2 | success
LIST B: containes 3 fields & 183 entries (FIXED number), like:
9647805651885 9647805651885 SCP_10
What I want is a... (8 Replies)
Discussion started by: amurib
8 Replies
7. Shell Programming and Scripting
Hi,
I do little bash scripting so sorry for my ignorance.
How do I compare if the two variable not match and if they do not match run a command.
I was thinking a for loop but then I need another for loop for the 2nd list and I do not think that would work as in the real world there could... (2 Replies)
Discussion started by: GermanJulian
2 Replies
8. Shell Programming and Scripting
Hi everybody!
I'm trying to delete some elements from a list with two elements on each row agreeing with the elements in another list. Pratically I want a perl script able to take each element of the second list (that is a single column list), compare it with both elements of each row from the... (3 Replies)
Discussion started by: gabrysfe
3 Replies
9. Shell Programming and Scripting
I have two files A and B listing ip addresses
and all the ip addresses in B are in A, and A includes other ip addresses
now I want to get the list of the ip addresses that are in A but not in B
how to achieve this? thanks (1 Reply)
Discussion started by: esolvepolito
1 Replies
10. Homework & Coursework Questions
Hello,
I'm new to the python programming, and I have a question.
I have to write a program that prints a receipt for a restaurant. The input is a list which looks like:
product1
product3
product8
....
In the other input file there is a list which looks like:
product1 coffee 5,00... (1 Reply)
Discussion started by: dagendy
1 Replies
INTRO(1) User Contributed Perl Documentation INTRO(1)
NAME
PDL::Intro - Introduction to the Perl Data Language
Version 2.0
"Why is it that we entertain the belief that for every purpose odd numbers are the most effectual?" - Pliny the Elder.
Karl Glazebrook [karlglazebrook@yahoo.com]
DESCRIPTION
Perl is an extremely good and versatile scripting language, well suited to beginners and allows rapid prototyping. However until recently
it did not support data structures which allowed it to do fast number crunching.
However with the development of Perl v5, Perl acquired Objects. To put it simply users can define their own special data types, and write
custom routines to manipulate them either in low level languages (C and Fortran) or in Perl itself.
This has been fully exploited by the PDL developers. The "PDL" module is a complete Object-Oriented extension to Perl (although you don't
have to know what an object is to use it) which allows large N-dimensional data sets, such as large images, spectra, time series, etc to be
stored efficiently and manipulated en masse. For example with the PDL module we can write the perl code "$a=$b+$c", where $b and $c are
large datasets (e.g. 2048x2048 images), and get the result in only a fraction of a second.
PDL variables (or piddles as they have come to be known) support a wide range of fundamental data types - arrays can be bytes, short inte-
gers (signed or unsigned), long integers, floats or double precision floats. And because of the Object-Oriented nature of PDL new cus-
tomised datatypes can be derived from them.
As well as the PDL modules, that can be used by normal perl programs, PerlDL comes with a command line perl shell, called perldl, which
supports command line editing. In combination with the various PDL graphics modules this allows data to be easily played with and visu-
alised.
SYNOPSIS
This manual page provides a general introduction to the underlying philosophy of PDL. For an overview over the rest of the documentation
see PDL::Index. As a beginner the following documents are particulary recommended:
PDL::Impatient
Quick summary - PDL for the impatient
PDL::FAQ
The Frequently Asked Questions list for PDL.
PDL::Philosophy
Why another matrix language?
PDL::Indexing
An introduction to using smart indices in PDL.
PDL::NiceSlice
The all important slicing of piddles.
AUTHOR
Copyright (C) Karl Glazebrook (karlglazebrook@yahoo.com), Tuomas J. Lukka, (lukka@husc.harvard.edu) and Christian Soeller (c.soeller@auck-
land.ac.nz) 1997-2002.
Commercial reproduction of this documentation in a different format is forbidden without permission.
perl v5.8.0 2002-03-18 INTRO(1)