feat: add branch 4 logic in base.js

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---

Author: DivitJain26

lib/node_modules/@stdlib/blas/base/ctpmv/lib/base.js

@@ -46,13 +46,13 @@ var muladd = require( '@stdlib/complex/float32/base/mul-add' ).assign;
 * @returns {Complex64Array} `x`
 *
 * @example
-* var Complex64Array = require( '@stdlib/array/float64' );
+* var Complex64Array = require( '@stdlib/array/complex64' );
 *
-* var AP = new Complex64Array( [  ] );
-* var x = new Complex64Array( [  ] );
+* var AP = new Complex64Array( [ 1.0, 1.0, 2.0, 2.0, 4.0, 4.0, 3.0, 3.0, 5.0, 5.0, 6.0, 6.0 ] );
+* var x = new Complex64Array( [ 1.0, 1.0, 2.0, 2.0, 3.0, 3.0 ] );
 *
-* ctpmv( 'row-major', 'upper', 'no-transpose', 'unit', 3, AP, 1, 0, x, 1, 0 );
-* // x => <Complex64Array>[  ]
+* ctpmv( 'row-major', 'lower', 'no-transpose', 'non-unit', 3, AP, 1, 0, x, 1, 0 );
+* // x => <Complex64Array>[ 0.0, 2.0, 0.0, 20.0, 0.0, 62.0 ]
 */
 function ctpmv( order, uplo, trans, diag, N, AP, strideAP, offsetAP, x, strideX, offsetX ) { // eslint-disable-line max-params, max-len
 	var nonunit;
@@ -62,7 +62,6 @@ function ctpmv( order, uplo, trans, diag, N, AP, strideAP, offsetAP, x, strideX,
 	var imtmp;
 	var isrm;
 	var sign;
-	var imx;
 	var rex;
 	var imx;
 	var rea;
@@ -209,9 +208,41 @@ function ctpmv( order, uplo, trans, diag, N, AP, strideAP, offsetAP, x, strideX,
 		}
 		return x;
 	}
+	// ( !isrm && uplo === 'lower' && trans !== 'no-transpose' ) || ( isrm && uplo === 'upper' && trans === 'no-transpose' )
+	ix1 = ox;
+	for ( i1 = 0; i1 < N; i1++ ) {
+		rex = viewX[ ix1 ];
+		imx = viewX[ ix1 + 1 ];
+		iap = kk;
+		ix0 = ix1;
+		if ( nonunit ) {
+			rea = viewAP[ iap ];
+			ima = sign * viewAP[ iap + 1 ];
+			retmp = f32( ( rea * rex ) - ( ima * imx ) );
+			imtmp = f32( ( rea * imx ) + ( ima * rex ) );
+		} else {
+			retmp = rex;
+			imtmp = imx;
+		}
+		for ( i0 = i1+1; i0 < N; i0++ ) {
+			ix0 += sx;
+			iap += sap;
+			rea = viewAP[ iap ];
+			ima = sign * viewAP[ iap + 1 ];
+			rex = viewX[ ix0 ];
+			imx = viewX[ ix0 + 1 ];
+			retmp += f32( ( rea * rex ) - ( ima * imx ) );
+			imtmp += f32( ( rea * imx ) + ( ima * rex ) );
+		}
+		viewX[ ix1 ] = retmp;
+		viewX[ ix1 + 1 ] = imtmp;
+		ix1 += sx;
+		kk += ( N - i1 ) * sap;
+	}
+	return x;
 }
 
 
 // EXPORTS //
 
-module.exports = ctpmv;
+module.exports = ctpmv;