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Full Discussion: how can i find sqrt of a any number without using expr
Top Forums Shell Programming and Scripting how can i find sqrt of a any number without using expr Post 302307336 by otheus on Wednesday 15th of April 2009 06:15:26 AM
Old 04-15-2009
Heh, That expression is very problematic. Here's one that works. The first argument is a number, which becomes 0 if it's not provided or if it is less than 0. The second argument is the number of decimal places to output -- or 4 if not provided.
Code:
y=$1
scale=4
# Make sure input is a valid number.
test -n "$y" || y=0; test "$y" -ge 0 || y=0
# Make sure scale is some number
test -z "$2" || scale=$2
# calc square root via bc
{ echo "scale=$scale"; echo "sqrt($y)" ; } | bc

 

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LEARN ABOUT DEBIAN

svm-scale

svm-scale(1)							   User Manuals 						      svm-scale(1)

NAME

       svm-scale - scale data to a restricted range as preprocessing for SVM training

SYNOPSIS

       svm-scale [ -l lower ] [ -u upper ] [ -y y_upper ] [ -s save_filename ] [ -r restore_filename ] datafilename

DESCRIPTION

       svm-scale  reads  the  given  datafilename (a training or testing data file as specified in svm_train(1) or svm_predict(1) ) and scales all
       dimensions to the given ranges.

OPTIONS

       -l lower
	      lower is the lowest (minimal) value allowed in each dimension.  It defaults to -1.

       -u upper
	      upper is the highest (maximal) value allowed in each dimension.  It defaults to 1.

       -y y_lower
	      y_lower is a boolean value (0 or 1) indicating whether or not y-values (targets) should be scaled.  It defaults to 0.

       -s save_filename
	      save_filename indicates the filename to save the scaled data to.

       -r restore_filename
	      restore_filename indicates the filename reserved to hold the original (unscaled) data in case there is a need to restore.

FILES

       datafilename must be a training or testing dataset.

ENVIRONMENT

       No environment variables.

DIAGNOSTICS

       None documented; see Vapnik et al.

BUGS

       Please report bugs to the Debian BTS.

AUTHOR

       Chih-Chung Chang, Chih-Jen Lin <cjlin@csie.ntu.edu.tw>, Chen-Tse Tsai <ctse.tsai@gmail.com> (packaging)

SEE ALSO

       svm-train(1), svm-predict(1)

Linux								     MAY 2006							      svm-scale(1)
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