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# 1  
Old 10-03-2011
script to iterate
Hi

i need to find x in the following equation such that it satisfies this condition:

y/x-ln(x)-1.24=0

how can i write a script to iterate to give random x to satisfy this equation.
y is different each time too. any help with awk/shell script will be awesome!

thanks
# 2  
Old 10-04-2011
something along the lines of:

Code:
(rewriting your equation to isolate an iteration:

x=y/ln(3.455613x)
)

#  y=1;x=1;for i in {1..100}; do x=$(calc "$y/(log(3.455613*$x))"); echo $x;done
0.806452
0.975715
.
<snip>
.
0.890054
0.890054

where I have calc as a function:

#  typeset -f calc
calc ()
{
    nawk 'BEGIN { OFMT="%f"; print '"$*"'; exit}'
}

In this case, then:

#  calc "log(0.890054)"+1.24
1.123527

#  calc 1/0.890054
1.123527

You may prefer to define an epsilon value and check the diff between successive iterations to define your accuracy.

HTH

This User Gave Thanks to Tytalus For This Post:
saint2006
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