chore: use banded matrix

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---

Author: Shabareesh Shetty

lib/node_modules/@stdlib/blas/base/dgbmv/examples/index.js

@@ -18,7 +18,9 @@
 
 'use strict';
 
-var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var filled2dBy = require( '@stdlib/array/base/banded/filled2d-by' );
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
+var uniform = require( '@stdlib/random/array/discrete-uniform' );
 var dgbmv = require( './../lib' );
 
 var opts = {
@@ -29,11 +31,11 @@ var M = 3;
 var N = 3;
 
 // Define N-by-N banded matrix:
-var A = [ 0, 9, 10, 11, 12, 5, 1, 2, 0 ];
+var A = filled2dBy( [ N, N ], 1, 1, 0.0, discreteUniform.factory( -10, 10 ) );
 
 // Create random vectors:
-var x = discreteUniform( N, 0, 255, opts );
-var y = discreteUniform( M, 0, 255, opts );
+var x = uniform( N, 0, 255, opts );
+var y = uniform( M, 0, 255, opts );
 
 // Performs one of the matrix-vector operations `y := α*A*x + β*y`:
 dgbmv( 'row-major', 'no-transpose', M, N, 1, 1, 1.0, A, N, x, 1, 1.0, y, 1 );