[R] In praise of ->

[Liaw, Andy]

> From: Murray Jorgensen
> 
> This is not a problem, but I thought that I might say one or 
> two things 
> in favour of right pointing assignment before anybody 
> influential gets 
> the idea of scrapping it!
> 
> Situation (a)
> 
> You have just typed a long complcated expression into the console and 
> you suddenly realise that you will need it later in the session. Just 
> append
> -> something
> to the end of the expression. You can do this with any recently 
> evaluated expression with the help of the up-arrow key (in Windows at 
> least).

You can do this just as easily in two ways:

1. IforgotThis <- .Last.value   [This always works, even if command editing
is not available.]

2. If command line editing is available, hit [up-arrow], [home] (or ctrl-a)
then type IforgotThis = ...
 
> Situation (b)
> 
> You have written a chunk of code and you want to see how it 
> behaves for 
> various values of the scalar "fred". Just put
> -> fred
> at the start of the code block, type any number, then paste the code 
> into the console.

This is also easily accomodated w/o the use of ->:  Instead of 

MyValue -> fred
[code that follows]

use:

fred <-
MyValue
[code that follows]

Andy

 
> Cheers,  Murray
> 
> -- 
> Dr Murray Jorgensen      http://www.stats.waikato.ac.nz/Staff/maj.html
> Department of Statistics, University of Waikato, Hamilton, New Zealand
> Email: maj at waikato.ac.nz                                Fax 7 838 4155
> Phone  +64 7 838 4773 wk    +64 7 849 6486 home    Mobile 021 1395 862
> 
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