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Re: Is there a way to do comment with just one keystroke at the start
Posted:
Nov 19, 2012 7:18 PM


On 14/11/2012 06:50, Murray Eisenberg wrote: > On Nov 13, 2012, at 12:05 AM, Eric Rasmusen<erasmuse61@gmail.com> wrote: >> >> The standard way to do comments in Mathematica is like this >> (*Here is a comment*) >> >> In Latex, a short comment only takes one symbol, at the start of the line: >> %Here is a latex comment >> >> Is there a way to comment in Mathematica without the closing symbols? is there an any easy way to make a macro to imitate latex comments? > > Sorry, but that's the way it is. > > Of course you could use Text cells instead of embedding comments inside an Input cell. > > That won't work, of course, if you need to insert comments within (too?)long code in an Input cell. In the latter case, you could try the following: > > Comment[blah___] := Null > > For example: > > Comment["first we do this"] > 1 + 1 > Comment[next] > x + 2 > Comment[] >
Unfortunately, this breaks for certain comment positions:
In[809]:= Comment[blah___] := Null
In[810]:= Sin[Comment["angle"] Pi]
Out[810]= Sin[Null \[Pi]]
Possibly a slightly better version would be:
Comment[blah___] := Sequence @@ {}
However, even that will fail if used inside Hold[...], and probably in other situations as well, so I don't advise using it.
I think a UNICODE character reserved for comment out of one line would be a valuable feature, and maybe also a pair of characters equivalent to (* and *), which are IMHO very ugly!
David Bailey http://www.dbaileyconsultancy.co.uk



