// test inv
var assert = require('assert');
var math = require('../../../math.js');

assert.deepEqual(math.inv(4), 1/4);
assert.deepEqual(math.inv([4]), [1/4]);
assert.deepEqual(math.inv([[4]]), [[1/4]]);
assert.ok(math.inv(math.matrix([4])) instanceof math.type.Matrix);
assert.ok(math.inv(math.matrix([[4]])) instanceof math.type.Matrix);
assert.deepEqual(math.inv(math.matrix([4])).valueOf(), [1/4]);
assert.deepEqual(math.inv(math.matrix([[4]])).valueOf(), [[1/4]]);
assert.deepEqual(math.inv(math.matrix([[1,2],[3,4]])).valueOf(), [[-2, 1],[1.5, -0.5]]);
assert.deepEqual(math.format(math.inv([
    [ 1, 4,  7],
    [ 3, 0,  5],
    [-1, 9, 11]
])), math.format([
    [ 5.625, -2.375, -2.5],
    [ 4.75,  -2.25,  -2],
    [-3.375,  1.625,  1.5]
]));
assert.deepEqual(math.format(math.inv([
    [ 2, -1,  0],
    [-1,  2, -1],
    [ 0, -1,  2]
])), math.format([
    [3/4, 1/2, 1/4],
    [1/2, 1,   1/2],
    [1/4, 1/2, 3/4]
]));
assert.deepEqual(math.format(math.divide(1, [
    [ 1, 4,  7],
    [ 3, 0,  5],
    [-1, 9, 11]
])), math.format([
    [ 5.625, -2.375, -2.5],
    [ 4.75,  -2.25,  -2],
    [-3.375,  1.625,  1.5]
]));