02-17-2009
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Heres a script i wrote as a bit of practise. What it does is insert a line in the middle of a file. The line being $1 and the file being $2
#!/bin/bash
rm tempfile
touch tempfile
count=1
linenum= `wc -l < $2`
if
then
echo $1 >> $2
else
even=`expr "$linenum" % 2`
if
then... (3 Replies)
Discussion started by: Quesa
3 Replies
2. UNIX for Dummies Questions & Answers
Hay, guys,
Any ideas how to calculate like this:
in first file, there're number of lines listing 2+3, 6*9 .......
Then, how to get the result and put them in another file in format:
2+3 5
6*9 54
......
sheerly by shell command, no scripts required. (4 Replies)
Discussion started by: robbinGlasses
4 Replies
3. Shell Programming and Scripting
Hi,
Is there a way to evaluate an equation contained in a string within an AWK script?
For example:
A = "(5*2)-1" (this equation is read from a file and varies line by line)
In this example, I can't see any way to get an answer of 9 unless I do:
cmd = "awk 'BEGIN{print "A"}'"
cmd |... (3 Replies)
Discussion started by: srdgeo
3 Replies
4. Shell Programming and Scripting
Hello,
I'm trying to write a while loop for a decimal value in tcsh which I know can't be done. Instead I want my increments to be one order of magnitude too large and then divide it by 10 when I use the variable. However, I don't know how to divide my variable and set it as another.
set... (1 Reply)
Discussion started by: DFr0st
1 Replies
5. High Performance Computing
I'm running a MPI program using a cluster of 4 machines(different machines of different processing power,cpu utilization etc.). I'm trying to balance the computation among the machine to get the minimum execution time for that. I tried to balance it by creating a threshold value by taking the load... (1 Reply)
Discussion started by: chamila1986
1 Replies
6. Shell Programming and Scripting
Hi All
I've made a few scripts which using GDAL extract the value of a pixel within a given raster. The purpose is to work out the combine value of every pixel. I thought there may have been an easier way to do this but alas!
The code below extracts the pixel value at position X Y. The... (3 Replies)
Discussion started by: StudentFitz
3 Replies
7. Shell Programming and Scripting
Hi, I am trying to make a maths calculator that:
1. Prompts the user for a number.
2. Prompts the user for an operation (add, subtract, divide or multiply)
3. Prompts the user for a number.
4. Prompts the user for another operation (same as above) OR the option to get the result for the... (4 Replies)
Discussion started by: johnthebaptist
4 Replies
8. Shell Programming and Scripting
Hi,
Need help on this. I need to increment a variable by 1 but retain as 2 characters.
I am using expr to do additions:
NEWSERIAL=`expr $SERIAL + 1`
$SERIAL can range from 01-99. After adding "1", I need the result to be 2 characters, eg: 02+1 = 03. By default expr will truncate the... (4 Replies)
Discussion started by: vchee
4 Replies
9. Shell Programming and Scripting
HI All,
I have a script in bash that i want that script will perform action
When the size of a particular folder exceeds the 80%.
Here is an example of script that result is exactly 80% :
#!/bin/bash
CHECK=$(df -h /var/log/syslog | grep '80%' | xargs echo | cut -d' ' -f5)
if ];... (1 Reply)
Discussion started by: Aviel.shani
1 Replies
10. Shell Programming and Scripting
Hi guys...
I am loving this integer maths thing.
64 bit systems are certainly easier than 32 bit, but hey, I don't intend to leave out my fav' platform.
Using one of the 'Brothers' methods, URL inside the code.
#!/bin/sh
#
# #!/usr/local/bin/dash
# e_constant.sh
# Brother's formula .
#... (2 Replies)
Discussion started by: wisecracker
2 Replies
LEARN ABOUT DEBIAN
math::symbolic::derivative
Math::Symbolic::Derivative(3pm) User Contributed Perl Documentation Math::Symbolic::Derivative(3pm)
NAME
Math::Symbolic::Derivative - Derive Math::Symbolic trees
SYNOPSIS
use Math::Symbolic::Derivative qw/:all/;
$derived = partial_derivative($term, $variable);
# or:
$derived = total_derivative($term, $variable);
DESCRIPTION
This module implements derivatives for Math::Symbolic trees. Derivatives are Math::Symbolic::Operators, but their implementation is drawn
from this module because it is significantly more complex than the implementation of most operators.
Derivatives come in two flavours. There are partial- and total derivatives.
Explaining the precise difference between partial- and total derivatives is beyond the scope of this document, but in the context of
Math::Symbolic, the difference is simply that partial derivatives just derive in terms of explicit dependency on the differential variable
while total derivatives recongnize implicit dependencies from variable signatures.
Partial derivatives are faster, have been tested more thoroughly, and are probably what you want for simpler applications anyway.
EXPORT
None by default. But you may choose to import the total_derivative() and partial_derivative() functions.
CLASS DATA
The package variable %Partial_Rules contains partial derivative rules as key-value pairs of names and subroutines.
SUBROUTINES
partial_derivative
Takes a Math::Symbolic tree and a Math::Symbolic::Variable as argument. third argument is an optional boolean indicating whether or not
the tree has to be cloned before being derived. If it is true, the subroutine happily stomps on any code that might rely on any components
of the Math::Symbolic tree that was passed to the sub as first argument.
total_derivative
Takes a Math::Symbolic tree and a Math::Symbolic::Variable as argument. third argument is an optional boolean indicating whether or not
the tree has to be cloned before being derived. If it is true, the subroutine happily stomps on any code that might rely on any components
of the Math::Symbolic tree that was passed to the sub as first argument.
AUTHOR
Please send feedback, bug reports, and support requests to the Math::Symbolic support mailing list: math-symbolic-support at lists dot
sourceforge dot net. Please consider letting us know how you use Math::Symbolic. Thank you.
If you're interested in helping with the development or extending the module's functionality, please contact the developers' mailing list:
math-symbolic-develop at lists dot sourceforge dot net.
List of contributors:
Steffen Mueller, symbolic-module at steffen-mueller dot net
Stray Toaster, mwk at users dot sourceforge dot net
Oliver Ebenhoeh
SEE ALSO
New versions of this module can be found on http://steffen-mueller.net or CPAN. The module development takes place on Sourceforge at
http://sourceforge.net/projects/math-symbolic/
Math::Symbolic
perl v5.10.1 2011-01-01 Math::Symbolic::Derivative(3pm)