| package groovy.operator |
| |
| /** |
| * Test to negate lists in Classic Groovy. |
| * Test to check whether a given function is even/odd on a given domain. |
| * |
| * @author Pilho Kim |
| * @version $Revision$ |
| */ |
| class NegateListsTest extends GroovyTestCase { |
| |
| void testNegateList() { |
| assert -[1, 2, 3] == [-1, -2, -3] |
| |
| def x = [1, 2, 3] |
| assert -x == [-1, -2, -3] |
| assert x == -[-1, -2, -3] |
| assert -(-x) == x |
| |
| def y = [-1, -2, -3] |
| assert -x == y |
| assert x == -y |
| } |
| |
| void testBitwiseNegateList() { |
| assert ~[1, 2, 3] == [-2, -3, -4] |
| |
| def x = [1, 2, 3] |
| assert ~x == [-2, -3, -4] |
| assert x == ~[-2, -3, -4] |
| assert ~~x == x |
| assert ~(~x) == x |
| |
| def y = [-2, -3, -4] |
| assert ~x == [-2, -3, -4] |
| assert x == ~y |
| } |
| |
| void testEvenFunction() { |
| def PI = Math.PI |
| |
| ///////////////////////////////////////////////////////////////////// |
| // A case of partition having 10 subintervals. |
| // x = [0.0*PI/2, 0.1*PI/2, 0.2*PI/2, 0.3*PI/2, 0.4*PI/2, 0.5*PI/2, |
| // 0.6*PI/2, 0.7*PI/2, 0.8*PI/2, 0.9*PI/2, 1.0*PI/2] |
| |
| ///////////////////////////////////////////////////////////////////// |
| // Generate a domain of function used om testing. |
| def n = 1000 // the number of partitions for the interval 0..2/PI |
| def x = [] |
| for (i in 0..n) { |
| x << i*PI/n |
| } |
| // println x |
| |
| def cos = { Math.cos(it) } |
| assertTrue(isEvenFn(cos, x)) |
| |
| def sin = { Math.sin(it) } |
| assertTrue(isOddFn(sin, x)) |
| |
| def tan = { Math.tan(it) } |
| assertTrue(isOddFn(tan, x)) |
| } |
| |
| boolean isEvenFn(f, domain) { |
| // println domain.collect(f) |
| // println( (-domain).collect(f) ) |
| println( (domain.collect(f)) == ((-domain).collect(f)) ) |
| return (domain.collect(f)) == ((-domain).collect(f)) |
| } |
| |
| boolean isOddFn(f, domain) { |
| // println domain.collect(f) |
| // println( (-domain).collect(f) ) |
| println( domain.collect(f) == -((-domain).collect(f)) ) |
| return domain.collect(f) == -((-domain).collect(f)) |
| } |
| } |