Examples of org.encog.ml.prg.EncogProgram

org.encog.ml.prg.EncogProgram
Holds an Encog Programming Language (EPL) program. A Encog program is internally represented as a tree structure. It can be rendered to a variety of forms, such as RPN, common infix expressions, or Latex. The Encog Workbench also allows display as a graphical tree. An Encog Program is both a genome and phenome. No decoding is necessary. Every Encog Program has a context. The context is the same for every Encog Program in a population. The context defines which opcodes should be used, as well as the defined variables. The actual values for the variables are not stored in the context. Rather they are stored in a variable holder. Each program usually has its own variable holder, though it is possible to share.

    String result = render.render(expression);    
    Assert.assertEquals("x [sin] x [cos] [+] 2 [/]", result);    
  }
  
  public void testKnownConst() {
    EncogProgram expression = new EncogProgram("x*2*PI");
    RenderRPN render = new RenderRPN();
    String result = render.render(expression);    
    Assert.assertEquals("x 2 [*] PI [*]", result);    
  }

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    expression.getVariables().setVariable("a",5);
    Assert.assertEquals(5,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }
  
  public void testNegAssignment() {
    EncogProgram expression = new EncogProgram("-a");
    expression.getVariables().setVariable("a",5);
    Assert.assertEquals(-5,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }

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    expression.getVariables().setVariable("a",5);
    Assert.assertEquals(-5,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }
  
  public void test2NegAssignment() {
    EncogProgram expression = new EncogProgram("--a");
    expression.getVariables().setVariable("a",5);
    Assert.assertEquals(5,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }

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    expression.getVariables().setVariable("a",5);
    Assert.assertEquals(5,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }
  
  public void testAssignment2() {
    EncogProgram expression = new EncogProgram("cccc*(aa+bbb)");
    expression.getVariables().setVariable("aa",1);
    expression.getVariables().setVariable("bbb",2);
    expression.getVariables().setVariable("cccc",3);
    Assert.assertEquals(9,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }

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    expression.getVariables().setVariable("cccc",3);
    Assert.assertEquals(9,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }
  
  public void testAssignment3() {
    EncogProgram expression = new EncogProgram("v1+v2+v3");
    expression.getVariables().setVariable("v1",1);
    expression.getVariables().setVariable("v2",2);
    expression.getVariables().setVariable("v3",3);
    Assert.assertEquals(6,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }

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    expression.getVariables().setVariable("v3",3);
    Assert.assertEquals(6,expression.evaluate().toFloatValue(),Encog.DEFAULT_DOUBLE_EQUAL);
  }
  
  public void testVarComplex() {
    EncogProgram expression = new EncogProgram("(x^((1+((x^-8)-(4^x)))^(((-7/2)-(0--5.8))/x)))");
    expression.getVariables().setVariable("x",10);
    Assert.assertTrue(Double.isNaN(expression.evaluate().toFloatValue()));
  }

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import org.encog.parse.expression.common.RenderCommonExpression;


public class TestRewriteConstants extends TestCase {
  
  public void eval(String start, String expect) {
    EncogProgram expression = new EncogProgram(start);
    RenderCommonExpression render = new RenderCommonExpression();
    RewriteConstants rewrite = new RewriteConstants();
    rewrite.rewrite(expression);
    Assert.assertEquals(expect, render.render(expression));
  }

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import org.encog.ml.prg.EncogProgram;


public class TestRenderCommon extends TestCase {
  
  public void testRenderBasic() {
    EncogProgram expression = new EncogProgram("(2+6)");
    RenderCommonExpression render = new RenderCommonExpression();
    String result = render.render(expression);
    Assert.assertEquals("(2+6)", result);
  }

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    String result = render.render(expression);
    Assert.assertEquals("(2+6)", result);
  }
  
  public void testRenderComplex() {
    EncogProgram expression = new EncogProgram("((a+25)^3/25)-((a*3)^4/250)");
    RenderCommonExpression render = new RenderCommonExpression();
    String result = render.render(expression);
    Assert.assertEquals("((((a+25)^3)/25)-(((a*3)^4)/250))", result);
  }

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    String result = render.render(expression);
    Assert.assertEquals("((((a+25)^3)/25)-(((a*3)^4)/250))", result);
  }
  
  public void testRenderFunction() {
    EncogProgram expression = new EncogProgram("(sin(x)+cos(x))/2");
    RenderCommonExpression render = new RenderCommonExpression();
    String result = render.render(expression);    
    Assert.assertEquals("((sin(x)+cos(x))/2)", result);    
  }

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