Calculate the performance of employee Post: 303037638

Sponsored Content

Top Forums Shell Programming and Scripting Calculate the performance of employee Post 303037638 by wisecracker on Thursday 8th of August 2019 12:45:55 PM

08-08-2019

Registered User

Hi rohit_shinez...
(Apologies for any typos.)
In bash? Hmm, awk - most probably as it has builtin scientific maths and floating point capability, but I am no expert.
Bash has ONLY integer maths and that is its limitation. As I quoted before if you have access to tools/utilities that can do floats, Python, Perl, bc, dc, or others then it is possible as is creating your own FIXED point maths calculator. (Note: 'maths' as I am UKan.)
A simple fully POSIX compliant example of making a floating point number divided by an integer like your case. All values are global here to make for an easy to understand to the problems involved if you don't have any decent tools to manipulate scientific and FP values.
Also POSIX does NOT allow x**y hence the multiplier function. Fortunately 'bash' CAN handle this in integer mode only but not shown:

Code:

#!/usr/local/bin/dash

NUMBER=0
M=0
N=0
MULTIPLIER=1
TIMES_TEN=10
POWER=1
NO_DECIMAL=1

remove_decimal_point()
{
    NUMBER=$1
    M=${NUMBER%.*}
    N=${NUMBER#*.}
    MULTIPLIER=${#N}
    NO_DECIMAL=${M}${N}
}

multiplier()
{
    TIMES_TEN=$1
    POWER=1
    while [ ${TIMES_TEN} -ge 1 ]
    do
        POWER=$(( POWER * 10 ))
        TIMES_TEN=$(( TIMES_TEN - 1 ))
    done
}

remove_decimal_point 321.12345678

multiplier ${MULTIPLIER}

echo "Variables as global for this demo..."
echo "${NUMBER}"
echo "${M}"
echo "${N}"
echo "${NO_DECIMAL}"
echo "${MULTIPLIER}"
echo "${TIMES_TEN}"
echo ""
echo "Two calculations..."
echo "Firstly: Convert back to original string..."
printf "%.8f\n" "$(( NO_DECIMAL ))e-${MULTIPLIER}"
echo "Secondly: Two integers being divided and converted to FLOAT string..."
printf "%.8f\n" "$(( NO_DECIMAL / 11 ))e-${MULTIPLIER}"
echo "Confirm using Python..."
python -c "print( 321.12345678 / 11 )"

Result for this maths dilemma: OSX 10.14.3, default bash terminal calling dash...

Code:

Last login: Thu Aug  8 16:51:21 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./Float_Test.sh
Variables as global for this demo...
321.12345678
321
12345678
32112345678
8
0

Two calculations...
Firstly: Convert back to original string...
321.12345678
Secondly: Two integers being divided and converted to FLOAT string...
29.19304152
Confirm using Python...
29.1930415255
AMIGA:amiga~/Desktop/Code/Shell> _

You now see your problem...
HOWEVER; as I also quoted 'ksh' supports floating point arithmetic, including, float**another_float , which I have used often...
Unless your system does NOT have Python support then the code you have already would probably be better suited translated to awk.
I will pass those thoughts on to our awk experts...
I hope this helps wrap things up...

wisecracker

View Public Profile for wisecracker

Find all posts by wisecracker

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

bc calculate problem

Hi , this is the first time i use bc to calculate and i would have decimal result , i use the following : toto=400;scale=1 echo $toto / 1000|bc scale to adjust the numbers after the command would have in this case 0.4 as result and i wonder why i have always 0 as result. Somebody can...

2. Shell Programming and Scripting

calculate output

I was wondering can anyone give me a clue how to start script which would do the following: I have 2 numbers as input for example: 100 and 1000 and I need to create file and in that file should be written 100 - 199 200 - 299 300 - 399 400 - 499 500 - 599 600 - 699 700 - 799...

3. News, Links, Events and Announcements

Announcing collectl - new performance linux performance monitor

About 4 years ago I wrote this tool inspired by Rob Urban's collect tool for DEC's Tru64 Unix. What makes this tool as different as collect was in its day is its ability to run at a low overhead and collect tons of stuff. I've expanded the general concept and even include data not available in...

4. Shell Programming and Scripting

calculate the space

Hi everyone, I need to write a script to calculate the space for sub-folders under /home: Here is the scanrio: cd /home drwxr-xr-x 57 root root 8192 Jan 22 16:13 home_1 drwxrwxrwx 69 root root 8192 Jan 29 10:36 home_2 drwxr-xr-x 97 root root 8192 Nov...

5. Shell Programming and Scripting

How can i calculate percentage ??

i have 3 files like total.dat=18 equal.dat=14 notequal.dat=16 i need find the equal percentange means: equalpercentage = ($equal.dat / $total.dat * 100) How i can do this ? I tried some of the answers to calculate the percentage in this forums.but it couldn't worked.Some one please...

6. Shell Programming and Scripting

How To Calculate

I have 2 variables in my shell scripts in which i am using awk and calculating 2 files and getting 2 different variable called in_total and out_total. I want to subtract one variable from another so plz tell me how i can do that. Example is: cat in_file | awk -F: '{ in_total += $1 * 86400...

7. Shell Programming and Scripting

Calculate age of a file | calculate time difference

Hello, I'm trying to create a shell script (#!/bin/sh) which should tell me the age of a file in minutes... I have a process, which delivers me all 15 minutes a new file and I want to have a monitoring script, which sends me an email, if the present file is older than 20 minutes. To do...

8. UNIX for Dummies Questions & Answers

Calculate

i have file input abcedef|wert|13|03|10|04|23|A1|13|05|01|09|31 fsdasdf|ferg|12|04|25|21|21|A1|13|02|26|20|31 dfsfsad|gerg|12|04|25|21|21|A1|13|02|25|25|31 i expect the output abcedef|wert|13|03|10|04|23|A1|13|05|01|09|31|9.516666667...

9. Shell Programming and Scripting

Employee records

If there are 2 records for an Employee, How can I choose the one with eff_status = �Active' and ignore the eff_status ='Terminated'. if there is only one record, then just write that record regardless of the eff_status. Please assist.

LEARN ABOUT DEBIAN

dispatch_benchmark

dispatch_benchmark(3)					   BSD Library Functions Manual 				     dispatch_benchmark(3)

NAME

     dispatch_benchmark -- Measures block execution time

SYNOPSIS

     #include <dispatch/dispatch.h>

     uint64_t
     dispatch_benchmark(size_t count, void (^block)(void));

     uint64_t
     dispatch_benchmark_f(size_t count, void *context, void (*function)(void *));

DESCRIPTION

     The dispatch_benchmark() function executes the given block multiple times according to the count variable and then returns the average number
     of nanoseconds per execution.  This function is for debugging and performance analysis work.  For the best results, pass a high count value
     to dispatch_benchmark().  When benchmarking concurrent code, please compare the serial version of the code against the concurrent version,
     and compare the concurrent version on different classes of hardware.  Please look for inflection points with various data sets and keep the
     following facts in mind:

	   o   Code bound by computational bandwidth may be inferred by proportional changes in performance as concurrency is increased.
	   o   Code bound by memory bandwidth may be inferred by negligible changes in performance as concurrency is increased.
	   o   Code bound by critical sections may be inferred by retrograde changes in performance as concurrency is increased.
		     o	 Intentional: locks, mutexes, and condition variables.
		     o	 Accidental: unrelated and frequently modified data on the same cache-line.

RETURN VALUE

     The dispatch_benchmark() function returns the average number of nanoseconds the given block takes to execute.

SEE ALSO

     dispatch(3)

Darwin								    May 1, 2009 							    Darwin