Lat/Long Distance Calculation Post: 302113984

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Top Forums Shell Programming and Scripting Lat/Long Distance Calculation Post 302113984 by Perderabo on Wednesday 11th of April 2007 09:25:03 PM

04-11-2007

Administrator Emeritus

Computing the inverse trig functions would be quite a chore. This really should be written in C. If you must use a script, maybe you can use a little C program to give you access to the C library? Here is a quick C program...

Code:

$ cat mathtool.c
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
int main(int argc, char *argv[])  {
        double arg2,result;
        arg2=strtod(argv[2],(char **) NULL);
        if (!strcmp(argv[1], "asin")) {
                result=asin(arg2);
        } else if (!strcmp(argv[1], "asind")) {
                result=asin(arg2)*57.29577951308232087679815481410517033240547246656432154916024386120;
        } else if (!strcmp(argv[1], "acos")) {
                result=acos(arg2);
        } else if (!strcmp(argv[1], "acosd")) {
                result=acos(arg2)*57.29577951308232087679815481410517033240547246656432154916024386120;
        } else if (!strcmp(argv[1], "atan")) {
                result=atan(arg2);
        } else if (!strcmp(argv[1], "atand")) {
                result=atan(arg2)*57.29577951308232087679815481410517033240547246656432154916024386120;
        } else {
                printf("error \n");
        }
        printf("%-20.6f \n", result);
        exit(0);
}
$
I-search:
$ gcc mathtool.c -l m -o mathtool
$ ./mathtool asin 1.0
1.570796
$ ./mathtool asind 1.0
90.000000

I only put in asin, acos, and atan, but you could add in the regular trig functions too. I also put in asind, acosd, and atand which converts the answer to degrees (not degrees, minutes, seconds).

Perderabo

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service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)