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libifeffit-perl - Perl extensions for IFEFFIT…  more info»


Ifeffit(3pm)     User Contributed Perl Documentation    Ifeffit(3pm)

       Ifeffit - Perl interface to the IFEFFIT XAFS Analysis

           use Ifeffit;
           use Ifeffit qw(put_scalar put_string put_array);
           use Ifeffit qw(get_scalar get_string get_array);

           my ($kmin, $my_file, $file_type ) = (0.01, "Cu.xmu", "xmu");
           put_scalar("rbkg", 1.1);
           put_scalar("kmin", $kmin);
           put_string("filename", $my_file);

           ifeffit(" read_data($my_file, prefix= my,");
           ifeffit("           type= $file_type)");
           ifeffit(" newplot (energy, xmu ) ");

           my $e0 = get_scalar("e0");
           print "e0 = $e0 , rbkg  = " ,get_scalar("rbkg"), "\n";

       The Ifeffit Perl Module gives access to the ifeffit library
       for XAFS analysis.  The module provides seven perl functions
       - ifeffit, put_scalar, get_scalar, put_string, get_string,
       put_array, and get_array.  The ifeffit is always provided
       (ie, exported by the "use Ifeffit;" pragma), but the other
       commands must be explicitly imported, as shown above.

       The ifeffit function provides the main interface to the
       ifeffit engine.  The character string argument is interpreted
       as an ifeffit command.  Ifeffit returns 0 if a valid command
       is sent and fully processed, -1 if a partial command has been
       sent (so that it will be expecting the rest of the command
       next), 1 if the "quit" command has been sent, and other non-
       zero valuses on error.  The syntax for and meaning of command
       lines to ifeffit is described in The Ifeffit Reference Manual
       of the Ifeffit distribution.  The syntax for the perl
       function is

       "$i = ifeffit("plot(my.x,  my.y)");"

       This sets the value of a named scalar in the list of ifeffit
       data.  The set value is returned on successful execution.
       The syntax is

       "$i = put_scalar("kweight", 2.0);".

       which is equivalent to

       "$i = ifeffit("kweight = 2.0");"

       But having a choice seems like the perl way.

       This returns the value of a named ifeffit scalar. The syntax

       "$value = get_scalar("x");"

       This sets the value of a named ifeffit string.  The value is
       returned on successful execution.  The syntax is

       "$i = put_text("home", "the merry old land of oz");".

       The same effect could be achieved with the command

       "$i = ifeffit("set \$home = 'the merry old land of oz'");".

       but put_text takes care of the icky leading dollar sign, and
       returns the string instead of a simple exit status.

       This returns the value of a named ifeffit string.  The syntax

       "$bg = get_string("plot_bg");"

       This copies a perl array of numeric values to an ifeffit
       array.  The syntax is


       which creates (or overwrites) the ifeffit array my.array, and
       fill it with the values of the perl array @array.  Note that
       the reference to the array is passed into put_array, not the
       whole array itself!

       This gets the values of an ifeffit array of numeric values.
       The syntax is

       "@array = get_array("my.array");"

       which will fill the perl array @array with the ifeffit array

       1.3 Begin distributing with horae package.

       1.3 (1)
           Force enclosure of string by double quotes in the
           put_string function.  (Bruce Ravel 18 Feb. 2003)

       Matthew Newville  --

       ifeffit, Ifeffit Reference Manual, perl(1)

       PGPERL, PDL,  GNU ReadLine Library

perl v5.14.2                 2011-12-30                 Ifeffit(3pm)
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