OpenRead (Built-in Mathematica Symbol)

OpenRead["file"] opens a file to read data from, and returns an InputStream object.

OpenWrite (Built-in Mathematica Symbol)

OpenWrite["file"] opens a file to write output to it, and returns an OutputStream object. OpenWrite[] opens a new file in the default area for temporary files on your ...

Operate (Built-in Mathematica Symbol)

Operate[p, f[x, y]] gives p[f][x, y]. Operate[p, expr, n] applies p at level n in the head of expr.

OperatingSystem (Built-in Mathematica Symbol)

OperatingSystem is an option for file and related operations that specifies the type of operating system to use to determine file name and other conventions.

Optional (Built-in Mathematica Symbol)

p : v is a pattern object that represents an expression of the form p, which, if omitted, should be replaced by v.

OptionInspectorSettings (Built-in Mathematica Symbol)

OptionInspectorSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies the display of options in the Option Inspector.

Options (Built-in Mathematica Symbol)

Options[symbol] gives the list of default options assigned to a symbol. Options[expr] gives the options explicitly specified in a particular expression such as a graphics ...

OptionsPattern (Built-in Mathematica Symbol)

OptionsPattern[] is a pattern object that represents a collection of options given as rules, where the values of the options can be accessed using OptionValue. ...

OptionValue (Built-in Mathematica Symbol)

OptionValue[name] gives the value of name in options matched by OptionsPattern. OptionValue[f, name] gives the value of name for options associated with the head f. ...

Orange (Built-in Mathematica Symbol)

Orange represents the color orange in graphics or style specifications.