# helpdlg

Creates a help dialog box.

## 📝 Syntax

* h = helpdlg()
* h = helpdlg(text\_help)
* h = helpdlg(text\_help, title)
* h = helpdlg(text\_help, title, 'on')

## 📥 Input argument

* text\_help - a string or a cell of string: the help message.
* title - a string: the title of the dialog box.

## 📤 Output argument

* h - a QObject handle.

## 📄 Description

errordlg creates an help dialog box.

h = helpdlg(text\_help, title, 'on') specifies whether to replace an existing dialog box having the same name.

## 💡 Examples

```matlab
h = helpdlg()
```

```matlab
h = helpdlg('help string')
```

```matlab
h = helpdlg('help string', 'dialog title')
```

```matlab
h = helpdlg('help string', 'dialog title')
h = helpdlg('help string', 'dialog title', 'on')
```

## 🔗 See also

[warndlg](/nelson/markdown/en/gui/warndlg.md), [errordlg](/nelson/markdown/en/gui/errordlg.md), [questdlg](/nelson/markdown/en/gui/questdlg.md), [msgbox](/nelson/markdown/en/gui/msgbox.md).

## 🕔 History

| Version | 📄 Description  |
| ------- | --------------- |
| 1.0.0   | initial version |


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