The GetExpression() calling sequence displays a Maplet application that prompts the user to enter an expression. This expression is returned to the Maple session.  If the user does not enter an expression, an exception is raised.

The GetExpression sample Maplet worksheet describes how to write a Maplet application that behaves similarly to this routine by using the Maplets[Elements] package.

The opts argument can contain one or more of the following equations that set Maplet application options.

caption = string

Specifies the text that prompts the user for an expression. By default, the caption is Enter an expression:.

title = string

Specifies the Maplet application title.  By default, the title is Get Expression.

width = posint

Specifies the input field width.  By default, the width is 30 characters.

$\mathrm{with}\left(\mathrm{Maplets}\left[\mathrm{Examples}\right]\right)\:$

$f≔\mathrm{GetExpression}\left(\right)$

$f≔y^2-4y$

$g≔\mathrm{GetExpression}\left(\right)$

$f≔\frac{\ⅆ}{\ⅆx}y\left(x\right)-{y\left(x\right)}^2$