02-17-2009
Perl - maths equation - need help
if input to the perl program is ' ( p * ((a+b) * (c+d))) + q ' it shuld give the output as ' pac + pad + pbc + pbd + q ' .can anyone suggest a way to do this ?
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
PAC(8) BSD System Manager's Manual PAC(8)
NAME
pac -- printer/plotter accounting information
SYNOPSIS
pac [-cmrs] [-Pprinter] [-pprice] [user ...]
DESCRIPTION
pac reads the printer/plotter accounting files, accumulating the number of pages (the usual case) or feet (for raster devices) of paper con-
sumed by each named user, and prints out how much each user consumed in pages or feet and dollars.
When no user arguments are given, statistics are printed for every user who has used any paper.
The options are as follows:
-Pprinter
Accounting is done for the named printer. Normally, accounting is done for the default printer (site dependent) or the value of the
environment variable PRINTER is used.
-c Causes the output to be sorted by cost; usually the output is sorted alphabetically by name.
-m Causes the host name to be ignored in the accounting file. This allows for a user on multiple machines to have all of his printing
charges grouped together.
-pprice
The value price is used for the cost in dollars instead of the default value of 0.02 or the price specified in /etc/printcap.
-r Reverse the sorting order.
-s Accounting information is summarized on the summary accounting file; this summarization is necessary since on a busy system, the
accounting file can grow by several lines per day.
OUTPUT FORMAT
pac formats the output into a simple table, using four columns:
1. The host name followed by the user's login name (column "Login"). If the -m option was specified, the host name will be omitted.
2. The number of pages or feet printed (column "pages/feet").
3. The number of copies made (column "runs").
4. The total price for the user (column "price").
If no user argument was specified, pac will print a summary line with print totals.
FILES
/var/account/?acct raw accounting files
/var/account/?_sum summary accounting files
/etc/printcap printer capability database
SEE ALSO
printcap(5)
HISTORY
The pac command appeared in 4.0BSD.
BUGS
The relationship between the computed price and reality is as yet unknown.
BSD
May 31, 2007 BSD