feat: add support for accessor arrays and refactor stats/base/stdevyc

Author: Hecker165

lib/node_modules/@stdlib/stats/base/stdevyc/lib/ndarray.js

@@ -20,8 +20,11 @@
 
 // MODULES //
 
-var varianceyc = require( '@stdlib/stats/base/varianceyc' ).ndarray;
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
+var accessors = require( './accessors.js' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var varianceyc = require( '@stdlib/stats/base/varianceyc' ).ndarray;
 
 
 // MAIN //
@@ -41,19 +44,25 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 * @returns {number} standard deviation
 *
 * @example
-* var floor = require( '@stdlib/math/base/special/floor' );
+* var x = [ 1.0, -2.0, 2.0 ];
 *
-* var x = [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ];
-*
-* var v = stdevyc( 4, 1, x, 2, 1 );
-* // returns 2.5
+* var v = stdevyc( x.length, 1, x, 1, 0 );
+* // returns ~2.0817
 */
 function stdevyc( N, correction, x, strideX, offsetX ) {
-	return sqrt( varianceyc( N, correction, x, strideX, offsetX ) );
+    var o;
+    
+    if ( N <= 0 ) {
+        return NaN;
+    }
+    o = arraylike2object( x );
+    if ( o.accessorProtocol ) {
+        return accessors( N, correction, o, strideX, offsetX );
+    }
+    return sqrt( varianceyc( N, correction, x, strideX, offsetX ) );
 }
 
 
-
 // EXPORTS //
 
 module.exports = stdevyc;