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Top Forums UNIX for Dummies Questions & Answers Computing for linearly-interpolated values using awk Post 302757935 by ida1215 on Friday 18th of January 2013 08:12:27 AM
Old 01-18-2013
Computing for linearly-interpolated values using awk

Hi,

I want to compute for linearly-interpolated values for my data using awk, any help is highly appreciated.

How do I apply the linear interpolation formula to my data in awk given the equation below:
Code:
x   y
15  0
25  0.1633611
35  0.0741623

desired output: linear interpolation at 0.1 interval
x        y_interpolated
15       0
15.1     0.001633611
15.2     0.003267222
15.3 ..  0.004900833 
24.9     0.161727489
25       0.1633611

the interpolated values (yn) were calculated using the ff. equation

y_n=((x_n-x_1)*(y_2 - y_1)/x_2 - x_1) + y_1

y_15.1=((15.1-15)*(0.1633611-0)/25-15)/0

Thank you very much.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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