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Mathematica > Core Language > Package Development > Options Management > SetOptions >

BUILT-IN MATHEMATICA SYMBOL

SetOptions

sets the specified default options for a symbol s.

sets options associated with a particular stream.

sets options associated with an external object such as a NotebookObject.

SetOptions is equivalent to an assignment that redefines certain elements of the list Options[s] of default options.

You can use SetOptions on InputStream and OutputStream objects. If there is only one stream with a particular name, you can give the name as a string as the argument of Options.

If you use SetOptions[NotebookObject[...], ...] the kernel will send a request to the front end that will immediately make the change specified.

Reset the default precision for HilbertMatrix:

Now HilbertMatrix uses machine numbers by default:

A specific option setting overrides the new default:

Restore the system default:

Change the style for plots to use dashed curves:

Restore the system default:

Reset the default precision for HilbertMatrix:

Out[1]=

Now HilbertMatrix uses machine numbers by default:

Out[2]=

A specific option setting overrides the new default:

Out[3]=

Restore the system default:

Change the style for plots to use dashed curves:

Out[2]=

Restore the system default:

For notebook options with rules, it can be awkward to make a targeted change to a specific rule:

CurrentValue provides a better way of adding or changing specific rules: