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+// Copyright (C) 2010 - DIGITEO - Michael Baudin
+//
+// This file must be used under the terms of the GNU LGPL license.
+
+function errmsg = Checktype ( funname , var , varname , ivar , expectedtype )
+  // Generates an error if the given variable is not of expected type.
+  //
+  // Calling Sequence
+  //   errmsg = Checktype ( funname , var , varname , ivar , expectedtype )
+  //
+  // Parameters
+  //   funname : a 1 x 1 matrix of strings, the name of the calling function.
+  //   var : a 1 x 1 matrix of valid Scilab data type, the variable
+  //   varname : a 1 x 1 matrix of string, the name of the variable
+  //   ivar : a 1 x 1 matrix of floating point integers, the index of the input argument in the calling sequence
+  //   expectedtype : a n x 1 or 1 x n matrix of strings, the available types for the variable #ivar
+  //   errmsg : a 1 x 1 matrix of strings, the error message. If there was no error, the error message is the empty matrix.
+  //
+  // Description
+  // This function is designed to be used to design functions with 
+  // input arguments with variable type.
+  // We use the typeof function to compute the type of the variable:
+  // see help typeof to get the list of all available values for expectedtype.
+  //   Last update : 29/07/2010.
+  //
+  // Examples
+  // // The function takes a string argument.
+  // function myfunction ( x )
+  //   Checktype ( "myfunction" , x , "x" , 1 , "string" )
+  //   disp("This is a string")
+  // endfunction
+  // // Calling sequences which work
+  // myfunction ( "Scilab" )
+  // // Calling sequences which generate an error
+  // myfunction ( 123456 )
+  //
+  // // The function takes a string or a matrix of doubles argument.
+  // function myfunction ( x )
+  //   Checktype ( "myfunction" , x , "x" , 1 , [ "string" "constant" ] )
+  //   if ( typeof(x) == "string" ) then
+  //     disp("This is a matrix of strings")
+  //   else
+  //     disp("This is a matrix of doubles")
+  //   end
+  // endfunction
+  // // Calling sequences which work
+  // myfunction ( "Scilab" )
+  // myfunction ( 123456 )
+  // // Calling sequences which generate an error
+  // myfunction ( uint8(2) )
+  //
+  // Authors
+  //   Michael Baudin - 2010 - DIGITEO
+  //
+
+  errmsg = []
+  if ( and ( typeof ( var ) <> expectedtype ) ) then
+    strexp = """" + strcat(expectedtype,""" or """) + """"
+    errmsg = msprintf(gettext("%s: Expected type [%s] for input argument %s at input #%d, but got ""%s"" instead."),funname, strexp, varname , ivar , typeof(var) );
+    error(errmsg);
+  end
+endfunction