fix: apply suggestions from code review

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: missing_dependencies
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/base/dcartesian-square/lib/ndarray.js

@@ -55,8 +55,10 @@ var dcopy = require( '@stdlib/blas/base/dcopy' ).ndarray;
 */
 function dcartesianSquare( N, x, strideX, offsetX, out, strideOut1, strideOut2, offsetOut ) { // eslint-disable-line max-len
 	var ix;
+	var jx;
 	var io;
 	var i;
+	var j;
 
 	if ( N <= 0 ) {
 		return out;
@@ -65,10 +67,14 @@ function dcartesianSquare( N, x, strideX, offsetX, out, strideOut1, strideOut2,
 	io = offsetOut;
 	if ( isRowMajor( [ strideOut1, strideOut2 ] ) ) {
 		for ( i = 0; i < N; i++ ) {
-			dfill( N, x[ ix ], out, strideOut1, io );
-			dcopy( N, x, strideX, offsetX, out, strideOut1, io + strideOut2 );
+			jx = offsetX;
+			for ( j = 0; j < N; j++ ) {
+				out[ io ] = x[ ix ];
+				out[ io + strideOut2 ] = x[ jx ];
+				jx += strideX;
+				io += strideOut1;
+			}
 			ix += strideX;
-			io += N * strideOut1;
 		}
 	} else { // order === 'column-major'
 		for ( i = 0; i < N; i++ ) {

lib/node_modules/@stdlib/blas/ext/base/dcartesian-square/src/main.c

@@ -67,8 +67,10 @@ void API_SUFFIX(stdlib_strided_dcartesian_square_ndarray)( const CBLAS_INT N, co
 	int64_t sa[ 2 ];
 	CBLAS_INT isrm;
 	CBLAS_INT ix;
+	CBLAS_INT jx;
 	CBLAS_INT io;
 	CBLAS_INT i;
+	CBLAS_INT j;
 	double v;
 
 	if ( N <= 0 ) {
@@ -81,11 +83,14 @@ void API_SUFFIX(stdlib_strided_dcartesian_square_ndarray)( const CBLAS_INT N, co
 		ix = offsetX;
 		io = offsetOut;
 		for ( i = 0; i < N; i++ ) {
-			v = X[ ix ];
+			jx = offsetX;
+			for ( j = 0; j < N; j++ ) {
+				Out[ io ] = X[ ix ];
+				Out[ io + strideOut2 ] = X[ jx ];
+				jx += strideX;
+				io += strideOut1;
+			}
 			ix += strideX;
-			API_SUFFIX(stdlib_strided_dfill_ndarray)( N, v, Out, strideOut1, io );
-			API_SUFFIX(c_dcopy_ndarray)( N, X, strideX, offsetX, Out, strideOut1, io + strideOut2 );
-			io += N * strideOut1;
 		}
 	} else { // isColMajor
 		ix = offsetX;