UndefFunction

Author: rajithv

ext/symengine/symengine_utils.c

@@ -8,7 +8,6 @@ void sympify(VALUE operand2, basic_struct *cbasic_operand2) {
     VALUE a, b;
     double f;
     char *c;
-    rb_cBigDecimal = CLASS_OF(rb_eval_string("BigDecimal.new('0.0001')"));
 
     switch(TYPE(operand2)) {
         case T_FIXNUM:
@@ -63,7 +62,7 @@ void sympify(VALUE operand2, basic_struct *cbasic_operand2) {
         case T_DATA:
             c = rb_obj_classname(operand2);
             #ifdef HAVE_SYMENGINE_MPFR
-            if(CLASS_OF(operand2) == rb_cBigDecimal){
+            if (strcmp(c, "BigDecimal") == 0) {
                 c = RSTRING_PTR( rb_funcall(operand2, rb_intern("to_s"), 1, rb_str_new2("F")) );
                 real_mpfr_set_str(cbasic_operand2, c, 200);
                 break;

lib/symengine.rb

@@ -1,6 +1,5 @@
 module SymEngine
   class << self
-
     # Defines a shortcut for SymEngine::Symbol.new() allowing multiple symbols
     # to be created all at once.
     #
@@ -29,6 +28,10 @@ def symbols ary_or_string, *params
       end
     end
   end
+  
+  def SymEngine.Function(n)
+    return SymEngine::UndefFunction.new(n)
+  end
 end
 
 require 'symengine/symengine'
@@ -37,3 +40,4 @@ def symbols ary_or_string, *params
 require 'symengine/integer'
 require 'symengine/complex'
 require 'symengine/complex_double'
+require 'symengine/undef_function'

lib/symengine/undef_function.rb

@@ -0,0 +1,13 @@
+module SymEngine
+  class UndefFunction
+    
+    def initialize(n)
+        @name = n
+    end
+    
+    def call(*args)
+        SymEngine::FunctionSymbol.new(@name, *args)
+    end
+    
+  end
+end