# Documentation

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# labelnode

Label graph nodes

## Syntax

``labelnode(H,nodeIDs,Labels)``

## Description

example

````labelnode(H,nodeIDs,Labels)` labels the nodes specified by `nodeIDs` with the character vectors contained in `Labels`. The lengths of `nodeIDs` and `Labels` must be equal, or `Labels` can be scalar.```

## Examples

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Create and plot a graph.

```s = [1 1 2 2 3 4 5 5]; t = [2 3 3 4 4 5 1 2]; G = digraph(s,t); h = plot(G);```

The `plot` function automatically labels the graph nodes with their node indices (or with their node names, if available). Use text labels for some of the graph nodes instead.

`labelnode(h,[1 2],{'source' 'target'})`

Label node 3 and node 4 as `'A'`. Since the node labels do not change the underlying graph, `G`, the labels can contain duplicate names (the official node names in `G` must always be unique).

`labelnode(h,[3 4],'A')`

## Input Arguments

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Input graph plot, specified as a `GraphPlot` object. Use the `graph` or `digraph` functions to create a graph, and then use `plot` with an output argument to return a `GraphPlot` object.

Example: `H = plot(G)`

Nodes to label, specified as a vector of node indices, a node name, or a cell array of character vectors containing node names.

Node labels, specified as a character vector or a cell array of character vectors.

• If `Labels` is a character vector, then `labelnode` uses that label for each node specified by `nodeIDs`.

• If `Labels` is a cell array, then it must contain a label for each node specified by `nodeIDs`.

Data Types: `char` | `cell`

## See Also

### Topics

#### Introduced in R2015b

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