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# Tensorflow.js tf.linalg.bandPart() Function

Tensorflow.js is an open-source library developed by Google for running machine learning models and deep learning neural networks in the browser or node environment. It also helps the developers to develop ML models in JavaScript language and can use ML directly in the browser or in Node.js.

The tf.linalg.bandPart() function is used to calculate the band part of the given tensor.

Syntax:

`tf.linalg.bandPart (a, numLower, numUpper)`

Parameters:

• a: it is tf.tensor to be passed.
• numLower: Number of subdiagonals to keep. If negative, keep entire lower triangle
• numUpper: Number of subdiagonals to keep. If negative, keep entire upper triangle

Return Value: It returns tf.Tensor1D.

Example 1:

## Javascript

 `// Importing the tensorflow.js library``import * as tf from ``"@tensorflow/tfjs"`` ` `const x = tf.tensor2d([[ 0,  1,  2, 3],``                     ``[ 4,  0,  1, 2],``                     ``[ 3,  1,  0, 1],``                     ``[ 3,  1,  1, 0]]);`` ` `let y = tf.linalg.bandPart(x, 1, 3);``y.print();`

Output:

```Tensor
[[0, 1, 2, 3],
[4, 0, 1, 2],
[0, 1, 0, 1],
[0, 0, 1, 0]]```

Example 2:

## Javascript

 `// Importing the tensorflow.js library``import * as tf from ``"@tensorflow/tfjs"`` ` `const x = tf.tensor2d([[ 0,  1,  2, 3],``                     ``[ 4,  0,  1, 2],``                     ``[ 3,  1,  0, 1],``                     ``[ 3,  1,  1, 0]]);`` ` `let k = tf.linalg.bandPart(x, -1, -3);``k.print();`

Output:

```Tensor
[[0, 1, 2, 3],
[4, 0, 1, 2],
[3, 1, 0, 1],
[3, 1, 1, 0]]```
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