diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/README.md b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/README.md
new file mode 100644
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--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/README.md
@@ -0,0 +1,136 @@
+
+
+# ztril
+
+> Copy the lower triangular part of a double-precision complex floating-point matrix `A` to another matrix `B`.
+
+
+
+
+
+
+
+
+
+## Usage
+
+```javascript
+var ztril = require( '@stdlib/blas/ext/base/ndarray/ztril' );
+```
+
+#### ztril( arrays )
+
+Copies the lower triangular part of a double-precision complex floating-point matrix `A` to another matrix `B`.
+
+
+
+```javascript
+var Complex128Matrix = require( '@stdlib/ndarray/matrix/complex128' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+
+var A = new Complex128Matrix( [ [ 1.0, 2.0, 3.0, 4.0 ], [ 5.0, 6.0, 7.0, 8.0 ] ] );
+var B = new Complex128Matrix( [ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ] );
+
+var k = scalar2ndarray( 0, {
+ 'dtype': 'generic'
+});
+
+var out = ztril( [ A, B, k ] );
+// returns [ [ [ 1.0, 2.0 ], [ 0.0, 0.0 ] ], [ [ 5.0, 6.0 ], [ 7.0, 8.0 ] ] ]
+
+var bool = ( out === B );
+// returns true
+```
+
+The function has the following parameters:
+
+- **arrays**: array-like object containing the following ndarrays:
+
+ - a two-dimensional input ndarray corresponding to `A`.
+ - a two-dimensional output ndarray corresponding to `B`.
+ - a zero-dimensional ndarray specifying the diagonal above which to ignore. A value equal to zero refers to the main diagonal, greater than zero refers to a diagonal above the main diagonal, and less than zero refers to a diagonal below the main diagonal.
+
+
+
+
+
+
+
+## Notes
+
+- Elements outside of the copied region are left unchanged.
+
+
+
+
+
+
+
+## Examples
+
+
+
+
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var Complex128Matrix = require( '@stdlib/ndarray/matrix/complex128' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var ztril = require( '@stdlib/blas/ext/base/ndarray/ztril' );
+
+var opts = {
+ 'dtype': 'float64'
+};
+
+var A = new Complex128Matrix( discreteUniform( 5*5*2, -50, 50, opts ).buffer, 0, 5, 5 );
+console.log( ndarray2array( A ) );
+
+var B = new Complex128Matrix( discreteUniform( 5*5*2, -50, 50, opts ).buffer, 0, 5, 5 );
+console.log( ndarray2array( B ) );
+
+var k = scalar2ndarray( 0, {
+ 'dtype': 'generic'
+});
+
+var out = ztril( [ A, B, k ] );
+console.log( ndarray2array( out ) );
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/benchmark/benchmark.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/benchmark/benchmark.js
new file mode 100644
index 000000000000..5ad19531c192
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/benchmark/benchmark.js
@@ -0,0 +1,120 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var Complex128Matrix = require( '@stdlib/ndarray/matrix/complex128' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var real = require( '@stdlib/complex/float64/real' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var pkg = require( './../package.json' ).name;
+var ztril = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+ 'dtype': 'float64'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+ var abuf;
+ var bbuf;
+ var A;
+ var B;
+ var k;
+
+ abuf = uniform( len*len*2, -100.0, 100.0, options );
+ bbuf = uniform( len*len*2, -100.0, 100.0, options );
+ A = new Complex128Matrix( abuf.buffer, 0, len, len );
+ B = new Complex128Matrix( bbuf.buffer, 0, len, len );
+
+ k = scalar2ndarray( 0, {
+ 'dtype': 'generic'
+ });
+
+ return benchmark;
+
+ /**
+ * Benchmark function.
+ *
+ * @private
+ * @param {Benchmark} b - benchmark instance
+ */
+ function benchmark( b ) {
+ var out;
+ var i;
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ out = ztril( [ A, B, k ] );
+ if ( typeof out !== 'object' ) {
+ b.fail( 'should return an ndarray' );
+ }
+ }
+ b.toc();
+ if ( isnan( real( out.get( i%len, i%len ) ) ) ) {
+ b.fail( 'should not return NaN' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+ }
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+ var len;
+ var min;
+ var max;
+ var f;
+ var i;
+
+ min = 1; // 10^min
+ max = 3; // 10^max
+
+ for ( i = min; i <= max; i++ ) {
+ len = pow( 10, i );
+ f = createBenchmark( len );
+ bench( format( '%s:len=%d', pkg, len ), f );
+ }
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/repl.txt b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/repl.txt
new file mode 100644
index 000000000000..8a619f47de1a
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/repl.txt
@@ -0,0 +1,42 @@
+
+{{alias}}( arrays )
+ Copies the lower triangular part of a double-precision complex floating-
+ point matrix `A` to another matrix `B`.
+
+ The diagonal parameter `k` specifies the diagonal above which to ignore. A
+ value of `k = 0` refers to the main diagonal, `k > 0` refers to a diagonal
+ above the main diagonal, and `k < 0` refers to a diagonal below the main
+ diagonal.
+
+ Parameters
+ ----------
+ arrays: ArrayLikeObject
+ Array-like object containing the following ndarrays:
+
+ - a two-dimensional input ndarray corresponding to `A`.
+ - a two-dimensional output ndarray corresponding to `B`.
+ - a zero-dimensional ndarray specifying the diagonal above which to
+ ignore.
+
+ Returns
+ -------
+ out: ndarray
+ Output ndarray.
+
+ Examples
+ --------
+ > var abuf = [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ];
+ > var A = new {{alias:@stdlib/ndarray/matrix/complex128}}( abuf );
+
+ > var bbuf = [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ];
+ > var B = new {{alias:@stdlib/ndarray/matrix/complex128}}( bbuf );
+
+ > var k = {{alias:@stdlib/ndarray/from-scalar}}( 0, { 'dtype': 'generic' } );
+
+ > {{alias}}( [ A, B, k ] );
+ > B
+ [ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ] ]
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/types/index.d.ts b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/types/index.d.ts
new file mode 100644
index 000000000000..87de2afaf477
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/types/index.d.ts
@@ -0,0 +1,61 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+///
+
+import { complex128ndarray, typedndarray } from '@stdlib/types/ndarray';
+
+/**
+* Copies the lower triangular part of a double-precision complex floating-point matrix `A` to another matrix `B`.
+*
+* ## Notes
+*
+* - The function expects the following ndarrays:
+*
+* - a two-dimensional input ndarray corresponding to `A`.
+* - a two-dimensional output ndarray corresponding to `B`.
+* - a zero-dimensional ndarray specifying the diagonal above which to ignore.
+*
+* @param arrays - array-like object containing ndarrays
+* @returns output ndarray
+*
+* @example
+* var Complex128Matrix = require( '@stdlib/ndarray/matrix/complex128' );
+* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+*
+* var A = new Complex128Matrix( [ [ 1.0, 2.0, 3.0, 4.0 ], [ 5.0, 6.0, 7.0, 8.0 ] ] );
+* var B = new Complex128Matrix( [ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ] );
+*
+* var k = scalar2ndarray( 0, {
+* 'dtype': 'generic'
+* });
+*
+* var out = ztril( [ A, B, k ] );
+* // returns [ [ [ 1.0, 2.0 ], [ 0.0, 0.0 ] ], [ [ 5.0, 6.0 ], [ 7.0, 8.0 ] ] ]
+*
+* var bool = ( out === B );
+* // returns true
+*/
+declare function ztril( arrays: [ complex128ndarray, complex128ndarray, typedndarray ] ): complex128ndarray;
+
+
+// EXPORTS //
+
+export = ztril;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/types/test.ts b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/types/test.ts
new file mode 100644
index 000000000000..bfc48cca942f
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/docs/types/test.ts
@@ -0,0 +1,70 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/* eslint-disable space-in-parens */
+
+import zeros = require( '@stdlib/ndarray/zeros' );
+import scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+import ztril = require( './index' );
+
+
+// TESTS //
+
+// The function returns an ndarray...
+{
+ const A = zeros( [ 2, 2 ], {
+ 'dtype': 'complex128'
+ });
+ const B = zeros( [ 2, 2 ], {
+ 'dtype': 'complex128'
+ });
+ const k = scalar2ndarray( 0, {
+ 'dtype': 'generic'
+ });
+
+ ztril( [ A, B, k ] ); // $ExpectType complex128ndarray
+}
+
+// The compiler throws an error if the function is provided a first argument which is not an array of ndarrays...
+{
+ ztril( '10' ); // $ExpectError
+ ztril( 10 ); // $ExpectError
+ ztril( true ); // $ExpectError
+ ztril( false ); // $ExpectError
+ ztril( null ); // $ExpectError
+ ztril( undefined ); // $ExpectError
+ ztril( [] ); // $ExpectError
+ ztril( {} ); // $ExpectError
+ ztril( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+ const A = zeros( [ 2, 2 ], {
+ 'dtype': 'complex128'
+ });
+ const B = zeros( [ 2, 2 ], {
+ 'dtype': 'complex128'
+ });
+ const k = scalar2ndarray( 0, {
+ 'dtype': 'generic'
+ });
+
+ ztril(); // $ExpectError
+ ztril( [ A, B, k ], {} ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/examples/index.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/examples/index.js
new file mode 100644
index 000000000000..65cf4d0963cd
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/examples/index.js
@@ -0,0 +1,42 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var Complex128Matrix = require( '@stdlib/ndarray/matrix/complex128' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var ztril = require( './../lib' );
+
+var opts = {
+ 'dtype': 'float64'
+};
+
+var A = new Complex128Matrix( discreteUniform( 5*5*2, -50, 50, opts ).buffer, 0, 5, 5 );
+console.log( ndarray2array( A ) );
+
+var B = new Complex128Matrix( discreteUniform( 5*5*2, -50, 50, opts ).buffer, 0, 5, 5 );
+console.log( ndarray2array( B ) );
+
+var k = scalar2ndarray( 0, {
+ 'dtype': 'generic'
+});
+
+var out = ztril( [ A, B, k ] );
+console.log( ndarray2array( out ) );
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/lib/index.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/lib/index.js
new file mode 100644
index 000000000000..e2f350009f1b
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/lib/index.js
@@ -0,0 +1,52 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Copy the lower triangular part of a double-precision complex floating-point matrix `A` to another matrix `B`.
+*
+* @module @stdlib/blas/ext/base/ndarray/ztril
+*
+* @example
+* var Complex128Matrix = require( '@stdlib/ndarray/matrix/complex128' );
+* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+* var ztril = require( '@stdlib/blas/ext/base/ndarray/ztril' );
+*
+* var A = new Complex128Matrix( [ [ 1.0, 2.0, 3.0, 4.0 ], [ 5.0, 6.0, 7.0, 8.0 ] ] );
+* var B = new Complex128Matrix( [ [ 0.0, 0.0, 0.0, 0.0 ], [ 0.0, 0.0, 0.0, 0.0 ] ] );
+*
+* var k = scalar2ndarray( 0, {
+* 'dtype': 'generic'
+* });
+*
+* var out = ztril( [ A, B, k ] );
+* // returns [ [ [ 1.0, 2.0 ], [ 0.0, 0.0 ] ], [ [ 5.0, 6.0 ], [ 7.0, 8.0 ] ] ]
+*
+* var bool = ( out === B );
+* // returns true
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/lib/main.js b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/lib/main.js
new file mode 100644
index 000000000000..592f271f16d7
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/ndarray/ztril/lib/main.js
@@ -0,0 +1,87 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var ndarraylike2scalar = require( '@stdlib/ndarray/base/ndarraylike2scalar' );
+var getShape = require( '@stdlib/ndarray/base/shape' );
+var getStrides = require( '@stdlib/ndarray/base/strides' );
+var getOffset = require( '@stdlib/ndarray/base/offset' );
+var getData = require( '@stdlib/ndarray/base/data-buffer' );
+var strided = require( '@stdlib/blas/ext/base/ztril' ).ndarray;
+
+
+// MAIN //
+
+/**
+* Copies the lower triangular part of a double-precision complex floating-point matrix `A` to another matrix `B`.
+*
+* ## Notes
+*
+* - The function expects the following ndarrays:
+*
+* - a two-dimensional input ndarray corresponding to `A`.
+* - a two-dimensional output ndarray corresponding to `B`.
+* - a zero-dimensional ndarray specifying the diagonal above which to ignore.
+*
+* @param {ArrayLikeObject