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test: add accessor array tests
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‎lib/node_modules/@stdlib/stats/base/stdevpn/test/test.ndarray.js‎

Lines changed: 156 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -21,9 +21,9 @@
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// MODULES //
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var tape = require( 'tape' );
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var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
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var sqrt = require( '@stdlib/math/base/special/sqrt' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
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var stdevpn = require( './../lib/ndarray.js' );
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@@ -44,6 +44,25 @@ tape( 'the function calculates the population standard deviation of a strided ar
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ];
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v = stdevpn( x.length, 0, x, 1, 0 );
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t.strictEqual( v, sqrt( 53.5/x.length ), 'returns expected value' );
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x = [ -4.0, -4.0 ];
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v = stdevpn( x.length, 0, x, 1, 0 );
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t.strictEqual( v, 0.0, 'returns expected value' );
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x = [ NaN, 4.0 ];
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v = stdevpn( x.length, 0, x, 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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t.end();
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});
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tape( 'the function calculates the population standard deviation of a strided array (accessors)', function test( t ) {
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ];
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v = stdevpn( x.length, 0, toAccessorArray( x ), 1, 0 );
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t.strictEqual( v, sqrt( 53.5/x.length ), 'returns expected value' );
@@ -63,6 +82,25 @@ tape( 'the function calculates the sample standard deviation of a strided array'
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ];
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v = stdevpn( x.length, 1, x, 1, 0 );
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t.strictEqual( v, sqrt( 53.5/(x.length-1) ), 'returns expected value' );
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x = [ -4.0, -4.0 ];
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v = stdevpn( x.length, 1, x, 1, 0 );
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t.strictEqual( v, 0.0, 'returns expected value' );
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x = [ NaN, 4.0 ];
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v = stdevpn( x.length, 1, x, 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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t.end();
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});
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tape( 'the function calculates the sample standard deviation of a strided array (accessors)', function test( t ) {
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ];
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v = stdevpn( x.length, 1, toAccessorArray( x ), 1, 0 );
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t.strictEqual( v, sqrt( 53.5/(x.length-1) ), 'returns expected value' );
@@ -84,6 +122,21 @@ tape( 'if provided an `N` parameter less than or equal to `0`, the function retu
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( 0, 1, x, 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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v = stdevpn( -1, 1, x, 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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t.end();
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});
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tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `NaN` (accessors)', function test( t ) {
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( 0, 1, toAccessorArray( x ), 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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@@ -99,6 +152,18 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns a populat
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( 1, 0, x, 1, 0 );
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t.strictEqual( v, 0.0, 'returns expected value' );
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t.end();
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});
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tape( 'if provided an `N` parameter equal to `1`, the function returns a population standard deviation of `0` (accessors)', function test( t ) {
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( 1, 0, toAccessorArray( x ), 1, 0 );
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t.strictEqual( v, 0.0, 'returns expected value' );
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@@ -111,6 +176,21 @@ tape( 'if provided a `correction` parameter yielding `N-correction` less than or
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( x.length, x.length, x, 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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v = stdevpn( x.length, x.length+1, x, 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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t.end();
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});
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tape( 'if provided a `correction` parameter yielding `N-correction` less than or equal to `0`, the function returns `NaN` (accessors)', function test( t ) {
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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114194
v = stdevpn( x.length, x.length, toAccessorArray( x ), 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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@@ -135,6 +215,27 @@ tape( 'the function supports a `stride` parameter', function test( t ) {
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2.0
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];
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v = stdevpn( 4, 1, x, 2, 0 );
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t.strictEqual( v, 2.5, 'returns expected value' );
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t.end();
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});
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tape( 'the function supports a `stride` parameter (accessors)', function test( t ) {
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var x;
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var v;
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x = [
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1.0, // 0
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2.0,
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2.0, // 1
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-7.0,
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-2.0, // 2
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3.0,
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4.0, // 3
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2.0
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];
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138239
v = stdevpn( 4, 1, toAccessorArray( x ), 2, 0 );
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140241
t.strictEqual( v, 2.5, 'returns expected value' );
@@ -156,6 +257,27 @@ tape( 'the function supports a negative `stride` parameter', function test( t )
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2.0
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];
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v = stdevpn( 4, 1, x, -2, 6 );
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t.strictEqual( v, 2.5, 'returns expected value' );
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t.end();
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});
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tape( 'the function supports a negative `stride` parameter (accessors)', function test( t ) {
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var x;
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var v;
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x = [
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1.0, // 3
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2.0,
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2.0, // 2
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-7.0,
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-2.0, // 1
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3.0,
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4.0, // 0
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2.0
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];
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159281
v = stdevpn( 4, 1, toAccessorArray( x ), -2, 6 );
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t.strictEqual( v, 2.5, 'returns expected value' );
@@ -168,6 +290,18 @@ tape( 'if provided a `stride` parameter equal to `0`, the function returns `0`',
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169291
x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( x.length, 1, x, 0, 0 );
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t.strictEqual( v, 0.0, 'returns expected value' );
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t.end();
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});
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tape( 'if provided a `stride` parameter equal to `0`, the function returns `0` (accessors)', function test( t ) {
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var x;
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var v;
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x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
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v = stdevpn( x.length, 1, toAccessorArray( x ), 0, 0 );
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t.strictEqual( v, 0.0, 'returns expected value' );
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@@ -189,6 +323,27 @@ tape( 'the function supports an `offset` parameter', function test( t ) {
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4.0 // 3
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];
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v = stdevpn( 4, 1, x, 2, 1 );
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t.strictEqual( v, 2.5, 'returns expected value' );
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t.end();
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});
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tape( 'the function supports an `offset` parameter (accessors)', function test( t ) {
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var x;
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var v;
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x = [
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2.0,
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1.0, // 0
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2.0,
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-2.0, // 1
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-2.0,
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2.0, // 2
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3.0,
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4.0 // 3
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];
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v = stdevpn( 4, 1, toAccessorArray( x ), 2, 1 );
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t.strictEqual( v, 2.5, 'returns expected value' );
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