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44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
// test inv
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var assert = require('assert'),
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approx = require('../../../tools/approx'),
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math = require('../../../index')();
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describe('inv', function() {
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it('should return the inverse of a number', function() {
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assert.deepEqual(math.inv(4), 1/4);
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assert.deepEqual(math.inv(math.bignumber(4)), math.bignumber(1/4));
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});
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it('should return the inverse for each element in an array', function() {
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assert.deepEqual(math.inv([4]), [1/4]);
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assert.deepEqual(math.inv([[4]]), [[1/4]]);
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approx.deepEqual(math.inv([
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[ 1, 4, 7],
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[ 3, 0, 5],
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[-1, 9, 11]
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]), [
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[ 5.625, -2.375, -2.5],
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[ 4.75, -2.25, -2],
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[-3.375, 1.625, 1.5]
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]);
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approx.deepEqual(math.inv([
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[ 2, -1, 0],
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[-1, 2, -1],
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[ 0, -1, 2]
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]), [
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[3/4, 1/2, 1/4],
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[1/2, 1, 1/2],
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[1/4, 1/2, 3/4]
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]);
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});
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it('should return the inverse for each element in a matrix', function() {
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assert.deepEqual(math.inv(math.matrix([4])), math.matrix([1/4]));
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assert.deepEqual(math.inv(math.matrix([[4]])), math.matrix([[1/4]]));
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assert.deepEqual(math.inv(math.matrix([[1,2],[3,4]])), math.matrix([[-2, 1],[1.5, -0.5]]));
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});
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}); |