Re: Chained-functional notation examples?
- To: mathgroup at smc.vnet.net
- Subject: [mg132696] Re: Chained-functional notation examples?
- From: Unknown <dog at gmail.com>
- Date: Wed, 7 May 2014 02:44:43 -0400 (EDT)
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On Tue, 06 May 2014 06:26:46 +0000, Unknown wrote: > I came to 'Mathematica' via Xahlee's criticism of the ad-hoc nature of > unix-piping [functional notation]. He claims [& I believe him] that > Mathematica has a better, more consistent notation. But the facility of > PRE, IN & POST-fix alternatives, seems bad. You want ONE way of > acieving the goal. More rules just increases mental load. > > A major benefit of functional [unix-piping] programming style, is that > you don't need to remember the-full-journey: you just need to remember > the previous stage's output. Nor do you need to remember several names: > the previous output is just "it". A superficial read through a recent > article[s] here, about <collecting data from several servers, and > agregating it, and sending the result to a master> seemed very > interesting, and matches my ideas of using functional programming. But > I can't afford to invest in ANOTHER notation/syntax, without good > prospect of productivety increase. > > Just as a test, how would Mathematica handle the following [or part of] > little task: > > search all files in Dir=tree D | > which are less than N days-old | > and which contain string S1 | > and which contain string S2 . > > Actually, this seems not a good example, since it's biased towards the > *nix file system's format/syntax. > > Try: > Search in table of ListOfOpenFiles for lineS with path-P [field] | > which have same tty-field as line with path-P2 & program-M [field] > > This sounds like a data-base problem? > > Or is there a nice list of 'such' Mathematica examples? > > Thanks, > > == John Grant. Here's a related real-live problem: list all files in Dir-tree:D | which are less-than daysOld:N | and contain "egal" in the FullPathName | and contain String:"uid" OR "UID"