Examples of mrstk.ComplexArray

mrstk.ComplexArray
This class represents an array of complex doubles. There are not many such implementations available: Jampack's Z1 is the best I could find, although it is imcomplete. I'm using a combination of Z1 and Matlab's core array functionality as a model for this class, but all the code is original.
This, along with ComplexScalar and DoubleArray, are intended to provide basic Complex and array functionality that Matlab provides. Therefore the nomenclature is modeled after Matlab where possible. @author bolan

        assertEquals(-0.605523000000000, z.getElement(0).imag(), epsilon);
    }
    
    @Test
    public void testMultiply_ComplexScalar() {
        ComplexArray z = x.multiply(y.getElement(2));
        System.out.println(x + " .* " + y.getElement(2) + " = " + z);
        assertEquals(x.getLength(), z.getLength());
        assertTrue(x.getElement(1).multiply(y.getElement(2)).equals(
                z.getElement(1), epsilon));
        assertEquals( -0.289697730000000, z.getElement(0).imag(), epsilon);
    }

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        assertEquals( -0.289697730000000, z.getElement(0).imag(), epsilon);
    }    


    @Test
    public void testMultiply_double() {
        ComplexArray z = x.multiply(Math.PI);
        System.out.println(x + " * PI = " + z);
        assertEquals(x.getLength(), z.getLength());
        assertTrue(x.getElement(1).multiply(Math.PI).equals(
                z.getElement(1), epsilon));
        assertEquals(-1.986743194130185, z.getElement(0).imag(), epsilon);
    }

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        assertEquals(-1.986743194130185, z.getElement(0).imag(), epsilon);
    }


    @Test
    public void testDivide_ComplexArray() {
        ComplexArray z = x.divide(y);
        System.out.println(x + " ./ " + y + " = " + z);        
        assertEquals(x.getLength(), z.getLength());
        assertTrue(x.getElement(1).divide(y.getElement(1)).equals(
                z.getElement(1), epsilon));
        assertEquals(-0.265995145981121, z.getElement(0).imag(), epsilon);
    }

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        assertEquals(-0.265995145981121, z.getElement(0).imag(), epsilon);
    }
    
    @Test
    public void testDivide_ComplexScalar() {
        ComplexArray z = x.divide(y.getElement(2));
        System.out.println(x + " .* " + y.getElement(2) + " = " + z);
        assertEquals(x.getLength(), z.getLength());
        assertTrue(x.getElement(1).divide(y.getElement(2)).equals(
                z.getElement(1), epsilon));
        assertEquals( -1.267791786447301, z.getElement(0).imag(), epsilon);
    }

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    }    


    
    @Test
    public void testDivide_double() {
        ComplexArray z = x.divide(Math.PI);
        System.out.println(x + " / PI = " + z);
        assertEquals(x.getLength(), z.getLength());
        assertTrue(x.getElement(1).divide(Math.PI).equals(
                z.getElement(1), epsilon));
        assertEquals(-0.201299172022629, z.getElement(0).imag(), epsilon);
    }

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        assertEquals(-0.201299172022629, z.getElement(0).imag(), epsilon);
    }


    @Test
    public void testConcatenate() {
        ComplexArray z = x.concatenate(y);
        System.out.println("x cat y = " + z.toString() );
        
        // Then pick out the subset
        ComplexArray w = z.subArray(3, 5);
        assertTrue(w.equals(y, epsilon));
        
    }

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    }


    @Test
    public void testCircShift() {
        ComplexArray z = x.circShift(1);
        assertEquals(x.getLength(), z.getLength());
        assertEquals(x.getMean(reductionMode.ABS), z.getMean(reductionMode.ABS), epsilon);


        assertTrue(x.getElement(0).equals(z.getElement(1)));
        assertTrue(x.getElement(1).equals(z.getElement(2)));
        assertTrue(x.getElement(2).equals(z.getElement(0)));
    }

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    }


    @Test
    public void testEquals() {
        y = x.clone();
        ComplexArray z = y.clone();


        assertNotSame(x, y);
        assertNotSame(x, z);
        assertNotSame(y, z);

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        // Hash codes MUST be equal for same object, 
        // should be different for different objects
        // and must be consistent
        int a = x.hashCode();
        ComplexArray z = x.clone();
        assertEquals(a, x.hashCode()); // Consistent
        assertEquals(a, x.hashCode()); // Consistent
        assertEquals(x.hashCode(), x.hashCode()); // Same for same object
        
        System.out.println("x: " + x + ", hashcode " + x.hashCode());
        System.out.println("y: " + y + ", hashcode " + y.hashCode());
        System.out.println("z: " + z + ", hashcode " + z.hashCode());


        assertEquals(z.hashCode(), x.hashCode()); // Same for equivalent object      
        assertFalse(x.hashCode() == y.hashCode()); // Different for different objects
    }

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    }
    
    @Test
    public void testResize() {
        // Test expansion
        ComplexArray z = x.resize(10);
        assertEquals(10, z.getLength());
        assertEquals(x.getElement(2), z.getElement(2));
        assertTrue(z.getElement(3).equals(ComplexScalar.ZERO));
        assertEquals(x.getMean(reductionMode.ABS), x.getMean(reductionMode.ABS), epsilon);
        
        // Test reduction
        ComplexArray w = x.resize(2);
        assertEquals(2, w.getLength());
        assertEquals(x.getElement(0), w.getElement(0));
        assertEquals(x.getElement(1), w.getElement(1));
              
        // Test no change
        ComplexArray v = x.resize(x.getLength());
        assertTrue(x.equals(v));        
    }

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