help Rec61
  ABAQUS element status output to MATLAB
  
  Syntax
      #Rec# = Fil2str('*.fil');
      #out# = Rec61(#Rec#)
 
  Description
      Read element status output from the results (*.fil) file generated
      from the ABAQUS finite element software. The asterisk (*) is replaced
      by the name of the results file. The record key for element status
      output is 61 (only in ABAQUS/Explicit). See section "Results file
      output format" in ABAQUS Analysis User's manual for more details.
      The following options with parameters have to be specified in the
      ABAQUS input file for the results (*.fil) file to be created and to
      contain element status results:
          ...
          *FILE FORMAT, ASCII
          *EL FILE
          STATUS
          ...
      NOTE: The results file (*.fil) must be placed in the same directory
      with the MATLAB source files in order to be processed.
      
  Input parameters
      #Rec# (string) is an one-row string containing the ASCII code of the
          ABAQUS results (*.fil) file. It is generated by the function
          Fil2str.m.
  
  Output parameters
      #out# ([#n# x 1]) is a double array containing the attributes of
          the record key 61 as follows:
          Column  1  –  Status of element (shear failure model, tensile
          failure model, porous failure criterion, brittle failure model,
          Johnson-Cook plasticity model, and VUMAT). The status of an
          element is 1.0 if the element is active, 0.0 if the element is
          not.
          where #n# is the number of elements multiplied by the number of
          increments. If the results file does not contain the desired
          output, #out# will be an empty array
 
  _________________________________________________________________________
  Copyright (c) 2016
      George Papazafeiropoulos
      Captain, Infrastructure Engineer, Hellenic Air Force
      Civil Engineer, M.Sc., Ph.D. candidate, NTUA
      Email: gpapazafeiropoulos@yahoo.gr
      Website: http://users.ntua.gr/gpapazaf/