ScalarQ (Quaternions Package Symbol)

ScalarQ[q] gives True if q is a real numeric quantity and False otherwise.

ToQuaternion (Quaternions Package Symbol)

ToQuaternion[q] transforms q into a Quaternion object if possible.

UnitQuaternionQ (Quaternions Package Symbol)

UnitQuaternionQ[q] gives True if q is a unit quaternion and False otherwise.

Mathematica Expressions in Files (Mathematica Guide)

Mathematica's symbolic architecture immediately defines a serializable representation for any Mathematica data or program—which can then readily be stored in a file.

Create Definitions for Variables and ... (Mathematica How To)

Mathematica has a very general notion of functions, as rules for arbitrary transformations. Values for variables are also assigned in this manner. When you set a value for a ...

Stop a Computation (Mathematica How To)

There will be times when you want to stop Mathematica in the middle of a computation. You may have asked Mathematica to do something that you did not intend or that is taking ...

Insert > Hyperlink... (Mathematica Menu Item)

Hyperlink creates a hyperlink to a specified cell, notebook, or URL.

File > New > Styled Notebook (Mathematica Menu Item)

Styled Notebook opens the Stylesheets palette to create a styled notebook.

Help > X Environment Information (Mathematica Menu Item)

X Environment Information opens a dialog box that displays the current attributes of the X front end environment (X only).

AlphaChannel (Built-in Mathematica Symbol)

AlphaChannel[image] returns the alpha channel of image.