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How to find arcsin for a coulmn containg values?

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# 1  
Old 09-04-2015
How to find arcsin for a coulmn containg values?
Hello everzone,

I have a column of values and i need to find arcsin for evry value in this column. I am very new to shell scripting and would be glad to receive any help regarding this. Also i want them to be saved in the next column.
Desired output:
Code:
#  #
a  arcsin(a)
b  arcsin(b)
c  arcsin(c)
d  arcsin(d)

Thanks,
Dinesh
Last edited by dinesh.n; 09-04-2015 at 04:43 AM..
# 2  
Old 09-04-2015
Hello Dinesh,

Could you please show the sample input too for your requirement. Also use code tags as per forum rules with your codes/same input.

NOTE: You can go through either forum rules or you can see a button in BAR while posting or replying to anyone named code.


Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
dinesh.n
# 3  
Old 09-04-2015
Hello R. Singh,

Thanks for the info. I keep forgetting code tags. You can find a sample of my input file. Actually my original file will contain more then 50k lines in a column.
Code:
       
0.4       
2       
2.433105012       
2.433105012       
2.8       
3.12409987       
3.12409987       
3.687817783       
3.687817783       
4.4

I am able to calculate the arcsin using python script. But large part of my code is in shell and it would great if i am able to do the same using shell.

Thanks,
Dinesh.n
Last edited by dinesh.n; 09-04-2015 at 05:00 AM..
# 4  
Old 09-04-2015
Given that the domain of values for the arcsine function is -1 <= x <= 1 and most of your values are not in that range, I'm not sure why we should bother.

And, you haven't told us what operating system or shell you're using.

If you have a 1993 or later version of ksh on your system, the following is a simple way to do what you requested:
Code:
#!/bin/ksh
while read x
do	printf '%15.10f %15.10f\n' "$x" "$((asin(x)))"
done < file

which, with your sample input in file with blank lines removed, produces the output:
Code:
   0.4000000000    0.4115168461
   2.0000000000            -nan
   2.4331050120            -nan
   2.4331050120            -nan
   2.8000000000            -nan
   3.1240998700            -nan
   3.1240998700            -nan
   3.6878177830            -nan
   3.6878177830            -nan
   4.4000000000            -nan

This User Gave Thanks to Don Cragun For This Post:
dinesh.n
# 5  
Old 09-04-2015
Hello R. Singh,

I want the value of inverse sin. Also i cant reply your mess since i have less then ten post made. Anyway i really apppreciate your effort.

Thanks,
Dinesh.n
# 6  
Old 09-04-2015
Hello Dinesh,

No problem, I requested you to post in actual post only not in message. Following may help you in same.
Code:
 awk '{print atan2($0, sqrt(1-$0 * $0))}' Input_file 2>/dev/null

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
dinesh.n
# 7  
Old 09-04-2015
Hello Don Cragun,

Thats true you are right. I am sorry for wasting most of your time. My real value should be looking:

Code:
  -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

I want the first column to be divided by the second column and then i want to find arcsin for this values. For eg,
PHP Code:
arcsin($1/$2) 
. I am using red hat linux and my script are in "ksh".

Thanks,
Dinesh.n
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