Plotting A Sine Curve Inside A Bash Shell... Post: 302914573

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Operating Systems OS X (Apple) Plotting A Sine Curve Inside A Bash Shell... Post 302914573 by Corona688 on Tuesday 26th of August 2014 05:28:54 PM

08-26-2014

Registered User

Interesting. You could roll it all up in awk, which I think is preferable, especially in Windows, which reacts badly to launching thousands of tiny short-lived processes:

Code:

$ awk '
 function qsin(X) {
         return(int((G/2)+(sin(X*(3.14159/180))*(G/2))))
 }

 BEGIN {
         if(!Q) Q=5; # 360/5 width
         if(!G) G=20; # 20 rows height

         for(M=0; M<G; M++) for(N=0; N<360; N+=Q) A[N,M]=" ";
         for(N=0; N<360; N+=Q) A[N,qsin(N)]="*";
         for(M=0; M<G; printf("\n", M++) ) for(N=0; N<360; N+=Q)
                 printf("%s", A[N,M]);
 }' /dev/null

                                                 ***********
                                               **           **
                                             **               **
                                            *                   *
                                           *                     **
                                         **                        *
                                        *                           *
                                       *                             *
                                      *                               *
                                     *                                 *
**                                 **
  *                               *
   *                             *
    *                           *
     **                        *
       *                     **
        *                   *
         **               **
           **           **
             ***********

$

awk can also output binary via printf("%c", 65); and the like.

Last edited by Corona688; 08-26-2014 at 06:35 PM..

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LEARN ABOUT LINUX

igawk

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)