Visit Our UNIX and Linux User Community

Use awk to log transform

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Use awk to log transform
# 1  
Old 09-13-2007
Use awk to log transform

Hello. I'm trying to use the awk command to convert certains fields to lgo base 2, not base 10.

I'm trying command lines like:

awk '$2 $5 $7 {print log(2)($2), log(2)($5), $7) filein.txt > fileout.txt

I'm trying to make a deadline.

Thanks for helping a newbie. Here's some fresh karma...
# 2  
Old 09-13-2007
this seems to work

If I use:
awk '{print log($2)/log(2)}'

this prints the value in log base 2. Had to look up some log transformations.

Previous Thread | Next Thread
Test Your Knowledge in Computers #701
Difficulty: Easy
MySQL NOT LIKE is a sardonic DB operator used to exclude those rows which are not liked by Oracle Corporation executives.
True or False?

9 More Discussions You Might Find Interesting

1. Programming

Transform SQL-Query to not use subqueries

Hi, I have a working SQL-Query here, in which I'm using subqueries to get the needed result. The idea behind this, is to get a list of networks which have 2 tags set in the database. Because of the way it is stored, i get a tuple for each Tag, so I get a duplicate of all networks. The... (1 Reply)
Discussion started by: stomp
1 Replies

2. Shell Programming and Scripting

Transform columns to matrix

The following code transform the matrix to columns. Is it possible to do it other way around ( get the input from the output) ? input y1 y2 y3 y4 y5 x1 0.3 0.5 2.3 3.1 5.1 x2 1.2 4.1 3.5 1.7 1.2 x3 3.1 2.1 1.0 4.1 2.1 x4 5.0 4.0 6.0 7.0 1.1 output x1 y1 0.3 x2 y1 1.2 x3... (1 Reply)
Discussion started by: quincyjones
1 Replies

3. Shell Programming and Scripting

Transform vertical into horizontal list

Hi, I am creating a script that will pull data from database. The only thing missing now is that i have to transform the lines into horizontal list. EXAMPLE 2015-07-15 09:00:00.0 |TCSERVER01 |5354 2015-07-15 09:01:00.0 |TCSERVER01 |6899 ... (5 Replies)
Discussion started by: reignangel2003
5 Replies

4. Shell Programming and Scripting

Add a number all the the values and log transform them using awk

Hi, is it possible to add a number to all the values in a file and log transform them using awk. thanx in advance input name c1 c2 c3 c4 r1 0 0.2 0.3 0.4 r2 0 0 0 1 r3 1 0 0 0 r4 0 0 1 ... (1 Reply)
Discussion started by: quincyjones
1 Replies

5. Shell Programming and Scripting

awk to log transform on matrix file

Hi Friends, I have an input matrix file like this Col1 Col2 Col3 Col4 R1 1 2 3 4 R2 4 5 6 7 R3 5 6 7 8 I would like to consider only the numeric values without touching the column header and the row header. I looked up on the forum's search, and I found this. But, I donno how to... (3 Replies)
Discussion started by: jacobs.smith
3 Replies

6. Programming

STL transform question

Hi all, I pass to the transform algorithm two vectors, and the suma function. #include <algorithm> #include <iostream> #include <iterator> #include <vector> using namespace std; class Duo{ public: int one; int two; }; Duo suma(Duo first, Duo last){ Duo ret; ... (1 Reply)
Discussion started by: santiagorf
1 Replies

7. UNIX for Dummies Questions & Answers

How to log transform a text file?

How can I log transform (log 2) a text file which is a single column of numbers? (4 Replies)
Discussion started by: evelibertine
4 Replies

8. UNIX for Dummies Questions & Answers

Using awk to log transform a column in a tab-delimited text file?

How do I use awk to log transform the fifth column of a tab-delimited text file? Thanks! (1 Reply)
Discussion started by: evelibertine
1 Replies

9. Shell Programming and Scripting

How to transform a string to a variable?

Hi all, I'm fairly new to shell scripting. My problem: I'm getting a string, "$XXOGL_TOP", from a database table. I then want to get the value of this variable in the shell script (which is a search path). But it doesn't dissolve but remains a string "$XXOGL_TOP". Any ideas on how to get the... (3 Replies)
Discussion started by: Kerstin
3 Replies

Featured Tech Videos