Re: Cell execution dependence
- To: mathgroup at smc.vnet.net
- Subject: [mg61955] Re: [mg61952] Cell execution dependence
- From: John Fultz <jfultz at wolfram.com>
- Date: Sat, 5 Nov 2005 22:41:41 -0500 (EST)
- Reply-to: jfultz at wolfram.com
- Sender: owner-wri-mathgroup at wolfram.com
You're correct. The front end uses the same rules as the kernel for determining whether a line break indicates the end of an input. That is to say, if you have a complete expression (all delimiters matched, no dangling infix operators) when a line breaks, then this will be considered a unitary input, and we start again with a new input on the next line. And so, things like... f[x] g[y] (* equivalent to f[x] * g[x] *) x // f (* equivalent to f[x] *) are *not* the same as... f[x] (* equivalent to f[x] *) g[x] (* equivalent to g[x] *) x (* equivalent to x *) // f (* a syntax error *) Sincerely, John Fultz jfultz at wolfram.com User Interface Group Wolfram Research, Inc. On Sat, 5 Nov 2005 01:53:05 -0500 (EST), carlos at colorado.edu wrote: > This post is related to a separate one on Mathematica > treatment of whitespace. But I thought it may be useful to clarify a > couple of related points by asking two general questions. > Given an input cell: > > 1) Are the results of cell execution independent of line breaks? > (More precisely, what is the effect of adding or removing CR/LF > chars) > 2) Are the results of cell execution independent of inactive whitespace? > (where "inactive" is specified by the rules of the language) > > My guesses are: no and yes.