help Rec89
  ABAQUS logarithmic strain output to MATLAB
  
  Syntax
      #Rec# = Fil2str('*.fil');
      #out# = Rec89(#Rec#)
 
  Description
      Read logarithmic strain 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
      logarithmic strain output is 89. 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 logarithmic strain results:
          ...
          *FILE FORMAT, ASCII
          *EL FILE
          LE
          ...
      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 #m#]) is a double array containing the attributes of
          the record key 89 as follows:
          Column  1  –  First logarithmic strain component. 
          Column  2  –  Second logarithmic strain component. 
          Column  3  –  Etc. (See “Elements” in Abaqus Analysis User's
          Manual for a definition of the number and type of the components
          for the element type).
          where #n# is the number of elements multiplied by the number of
          integration points multiplied by the number of section points
          (for shell, beam, or layered solid elements) multiplied by the
          number of increments, and #m# is the number of logarithmic strain
          components of each element. 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/