如何将非线性函数包含在TinyGP中?

时间:2015-12-03 23:42:42

标签: java recursion genetic-programming

我正在尝试扩展TinyGP软件的功能集,以包括非线性函数,例如sin,cos和tan。 问题是,树的打印是通过递归,打印个人,然后是函数(+, - ,*,/)然后是另一个人来完成的。所以结果就像(X2 * 2.365789)。但是,sin只接受一个参数sin(x)。如何更新打印方法?

打印方法的源代码概述如下。

int print_indiv( char []buffer, int buffercounter ) {
int a1=0, a2;
if ( buffer[buffercounter] < FSET_START ) {
  if ( buffer[buffercounter] < varnumber )
    System.out.print( "X"+ (buffer[buffercounter] + 1 )+ " ");
  else
    System.out.print( x[buffer[buffercounter]]);
  return( ++buffercounter );
  }
switch(buffer[buffercounter]) {
  case ADD: System.out.print( "(");
    a1=print_indiv( buffer, ++buffercounter ); 
    System.out.print( " + "); 
    break;
  case SUB: System.out.print( "(");
    a1=print_indiv( buffer, ++buffercounter ); 
    System.out.print( " - "); 
    break;
  case MUL: System.out.print( "(");
    a1=print_indiv( buffer, ++buffercounter ); 
    System.out.print( " * "); 
    break;
  case DIV: System.out.print( "(");
    a1=print_indiv( buffer, ++buffercounter ); 
    System.out.print( " / "); 
    break;
  }
a2=print_indiv( buffer, a1 ); 
System.out.print( ")"); 
return( a2);}

非常感谢你的帮助!

1 个答案:

答案 0 :(得分:0)

未经测试,但沿着此行的某些内容应该有效:

/* ... */
switch(buffer[buffercounter]) {
  /* .... */
  case SIN: System.out.print( "sin(");
    a1= ++buffercounter;
    break;
  /* ... */
  }

a2=print_indiv( buffer, a1 ); 
System.out.print( ")"); 
return( a2);