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Log function

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# 8  
Old 03-05-2007
Log Function
Thanks! It is working fine
Last edited by Ernst; 03-05-2007 at 11:15 PM..
# 9  
Old 03-05-2007
Log Function
Quote:
Originally Posted by sb008
The "log(x)" function is available in (n)awk

What is the format (formula) for the awk function. I am not familiar with it.
# 10  
Old 03-06-2007
Log Function
Quote:
Originally Posted by Perderabo
Put my script in a file called calc in your current directory. Do a "chmod u+x calc" to make the file executable. Then do "./calc" to run it.

It works. Now I need to understand the script itself. Would you mind explaining to me the meaning of each line.

Thanks for the help!
# 11  
Old 03-06-2007
Quote:
Originally Posted by Ernst
How do i write a code to convert watt to dBm and vice versa?
1o log(w) + 30 = dBm

Thanks!
you can use awk too..it has a log function

Code:
watt=0.9
awk -v wat=$watt 'BEGIN { print 10*log(wat) + 30 }'

# 12  
Old 03-08-2007
dBm to watt conversion
How can I modify the script below to convert from dBM to watt instead of watt to dBm?


#! /usr/bin/ksh
bc -l |&
print -p scale=6
echo "This is a program designed to convert watt to dbm"
while read watt?"enter watt: "; do
print -p "l($watt)/l(10)*10+30"
read -p dbm
echo "watt = $watt dbm = $dbm"
done
echo
exit 0
# 13  
Old 03-08-2007
Quote:
Originally Posted by Ernst
How can I modify the script below to convert from dBM to watt instead of watt to dBm?


#! /usr/bin/ksh
bc -l |&
print -p scale=6
echo "This is a program designed to convert watt to dbm"
while read watt?"enter watt: "; do
print -p "l($watt)/l(10)*10+30"
read -p dbm
echo "watt = $watt dbm = $dbm"
done
echo
exit 0
what would the 'backwards' conversion formula? (I'm lazy doing the math myself)
Last edited by vgersh99; 03-08-2007 at 11:28 AM..
# 14  
Old 03-08-2007
mW = 10dBm/10
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