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docs: update test files for clarity and consistency
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‎lib/node_modules/@stdlib/stats/base/variancetk/test/test.main.js

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@@ -59,6 +59,44 @@ tape( 'the function calculates the population variance of a strided array', func
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t.end();
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});
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tape( 'the function calculates the population variance 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 = variancetk( x.length, 0, toAccessorArray( x ), 1 );
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t.strictEqual( v, 53.5/x.length, 'returns expected value' );
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x = [ -4.0, -4.0 ];
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v = variancetk( x.length, 0, toAccessorArray( x ), 1 );
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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 = variancetk( x.length, 0, toAccessorArray( x ), 1 );
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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 variance of a strided array', 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 = variancetk( x.length, 1, x, 1 );
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t.strictEqual( v, 53.5/(x.length-1), 'returns expected value' );
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x = [ -4.0, -4.0 ];
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v = variancetk( x.length, 1, x, 1 );
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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 = variancetk( x.length, 1, x, 1 );
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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 variance of a strided array (accessors)', function test( t ) {
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var x;
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var v;
@@ -93,6 +131,21 @@ tape( 'if provided an `N` parameter less than or equal to `0`, the function retu
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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 = variancetk( 0, 1, toAccessorArray( x ), 1 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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v = variancetk( -1, 1, toAccessorArray( x ), 1 );
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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 equal to `1`, the function returns a population variance of `0`', function test( t ) {
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var x;
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var v;
@@ -105,6 +158,18 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns a populat
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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 variance 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 = variancetk( 1, 0, toAccessorArray( x ), 1 );
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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 `correction` parameter yielding `N-correction` less than or equal to `0`, the function returns `NaN`', function test( t ) {
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var x;
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var v;
@@ -120,6 +185,21 @@ tape( 'if provided a `correction` parameter yielding `N-correction` less than or
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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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v = variancetk( x.length, x.length, toAccessorArray( x ), 1 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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v = variancetk( x.length, x.length+1, toAccessorArray( x ), 1 );
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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 supports a `stride` parameter', function test( t ) {
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var x;
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var v;
@@ -216,6 +296,18 @@ tape( 'if provided a `stride` parameter equal to `0`, the function returns `0`',
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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 = variancetk( x.length, 1, toAccessorArray( x ), 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( 'the function supports view offsets', function test( t ) {
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var x0;
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var x1;
@@ -240,3 +332,28 @@ tape( 'the function supports view offsets', function test( t ) {
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t.end();
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});
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tape( 'the function supports view offsets (accessors)', function test( t ) {
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var x0;
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var x1;
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var v;
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x0 = new Float64Array([
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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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6.0
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]);
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x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
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v = variancetk( 4, 1, toAccessorArray( x1 ), 2 );
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t.strictEqual( v, 6.25, 'returns expected value' );
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t.end();
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});

‎lib/node_modules/@stdlib/stats/base/variancetk/test/test.ndarray.js

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@@ -130,6 +130,21 @@ tape( 'if provided an `N` parameter less than or equal to `0`, the function retu
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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 = variancetk( 0, 1, toAccessorArray( x ), 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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v = variancetk( -1, 1, toAccessorArray( 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 equal to `1`, the function returns a population variance of `0`', function test( t ) {
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var x;
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var v;
@@ -142,6 +157,18 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns a populat
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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 variance 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 = variancetk( 1, 0, toAccessorArray( 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 a `correction` parameter yielding `N-correction` less than or equal to `0`, the function returns `NaN`', function test( t ) {
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var x;
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var v;
@@ -157,6 +184,21 @@ tape( 'if provided a `correction` parameter yielding `N-correction` less than or
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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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v = variancetk( x.length, x.length, toAccessorArray( x ), 1, 0 );
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t.strictEqual( isnan( v ), true, 'returns expected value' );
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v = variancetk( x.length, x.length+1, toAccessorArray( 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 supports a `stride` parameter', function test( t ) {
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var x;
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var v;

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