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How to find arcsin for a coulmn containg values?

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Top Forums Shell Programming and Scripting How to find arcsin for a coulmn containg values?
# 8  
Old 09-04-2015
Hello Dinesh,

Following may help you in same.
Code:
cat values2
37.5    40.96950085
37.5    40.57708713
37.5    40.20572099
37.5    39.85599077
37.5    39.52847075
37.5     39.22371731
37.5     38.94226496
37.5    38.68462227
37.5    38.45126786
awk 'BEGIN{OFS="\t";print "VALUES:" OFS OFS OFS "reverse sine"} {A=$1/$2;print $0 OFS atan2(A, sqrt(1-A * A))}' OFS="\t" values2 2>/dev/null

Output will be as follows.
Code:
VALUES:                 reverse sine
37.5    40.96950085     1.15629
37.5    40.57708713     1.17885
37.5    40.20572099     1.20184
37.5    39.85599077     1.22524
37.5    39.52847075     1.24905
37.5     39.22371731    1.27323
37.5     38.94226496    1.29779
37.5    38.68462227     1.32268
37.5    38.45126786     1.3479

Where values2 is the Input_file I have used, hope this helps.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
dinesh.n
# 9  
Old 09-04-2015
Hello R. Singh,

Thanks for the code. It worked for me.

Thanks,
Dinesh.n
# 10  
Old 09-04-2015
Quote:
Originally Posted by dinesh.n
I want the value of inverse sin.
The domain of the inverse sinus (arcsine) function ranges from -0.5 \pi to + 0.5 \pi, (+90 deg - -90 deg; with corresponding sinus values from -1 to +1, as Don Cragun has already pointed out). Values above or below ~1.6 (roughly 0.5 \pi) make still no sense therefore.

I hope this helps.


/PS: You posted this in the meantime:
Quote:
I want the first column to be divided by the second column and then i want to find arcsin for this values.
So this point is moot.

bakunin
# 11  
Old 09-04-2015
And, if you want to try it in ksh directly without awk:
Code:
#!/bin/ksh
printf '%15s %15s %15s %15s\n' "x" "y" "x/y" "arcsine(x/y)"
while read x y
do	printf '%15.10f %15.10f %15.10f %15.10f\n' "$x" "$y" "$((x/y))" "$((asin(x/y)))"
done < file

producing, with your latest data:
Code:
              x               y             x/y    arcsine(x/y)
 -37.5000000000   40.9695008500   -0.9153150325   -1.1562894523
 -37.5000000000   40.5770871300   -0.9241668797   -1.1788488014
 -37.5000000000   40.2057209900   -0.9327030849   -1.2018367803
 -37.5000000000   39.8559907700   -0.9408874118   -1.2252407460
 -37.5000000000   39.5284707500   -0.9486832981   -1.2490457726
 -37.5000000000   39.2237173100   -0.9560542083   -1.2732346025
 -37.5000000000   38.9422649600   -0.9629640196   -1.2977876235
 -37.5000000000   38.6846222700   -0.9693774373   -1.3226828775
 -37.5000000000   38.4512678600   -0.9752604293   -1.3478960944

This User Gave Thanks to Don Cragun For This Post:
dinesh.n
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