setPrompt - Set the Command Window prompt

Sets the Command Window prompt to the specified string

setPrompt(newPrompt) sets the Command Window prompt to the specified NEWPROMPT.
NEWPROMPT can be one of the following:

- a static string: setPrompt('>> ')
=> this is the default prompt string ('>> ')

- an evaluable string: setPrompt('datestr(now)')
=> the new prompt will look like: '25-Jan-2010 01:00:51'
Note: the evaluable string is expected to return a string

- an evaluable function: setPrompt(@()(['[',datestr(now),'] ']))
=> the new prompt will look like: '[25-Jan-2010 01:00:51] '
Note: the evaluable function is expected to return a string

- the static string 'timestamp' will continuously update the last (current)
prompt with the current time: '[25-Jan-2010 01:00:51] '. This has
the effect of displaying desktop command execution times.
The 'timestamp' string can be used with other static text to
customize its appearance. For example: setPrompt('<timestamp!> ').
- an empty value or no input argument restores the default prompt

Examples:
setPrompt('[-]') % Replaces '>> ' prompt with '[-]'
setPrompt('%') % => '% ' (space-padded)
setPrompt('sprintf(''<%f>'',now)') % => '<734163.056262>'
setPrompt('datestr(now)') % => '25-Jan-2010 01:00:51' (unchanging)
setPrompt('[''['',datestr(now),''] '']') % => '[25-Jan-2010 01:00:51] '
setPrompt(@()(['[',datestr(now),'] '])) % => '[25-Jan-2010 01:00:51] '
(note that these are the same: the first uses an evaluable string,
while the second uses an evaluable function)
setPrompt('timestamp') % => '[25-Jan-2010 01:00:51] ' (continuously-updated)
setPrompt('<timestamp> ') % => '<25-Jan-2010 01:00:51> ' (continuously-updated)
setPrompt('>> ') % restores the default prompt
setPrompt('') % restores the default prompt
setPrompt % restores the default prompt

Warning:
This code heavily relies on undocumented and unsupported Matlab functionality. It works on Matlab 7+, but use at your own risk!

Technical explanation:
A technical explanation of the code in this utility can be found on http://undocumentedmatlab.com/blog/setprompt-setting-matlab-desktop-prompt/

Bugs and suggestions:
Please send to Yair Altman (altmany at gmail dot com)