Anyone know simple functions which can generate 3 dimentions indexed variable?
Currently, I am using a list storing the data.
A list variable (data<-list()) which contain some data.frame.
Can I use this list as a 3-dim matrix?
What if I wanna a vector with data of IBM for the year of 1998? How can I
retrieve that vector from the following list?
What if I wanna a matrix with data of IBM for the year from 1998 to 2004?
> data
$CSHO
IBM MSFT DELL GOOG CBS
1998 915.907 2470 322.0 NA 690.327
1999 1784.216 5109 1271.5 NA 751.214
2000 1742.900 5283 2575.0 NA NA
2001 1723.194 5383 2601.0 NA NA
2002 1722.367 5359 2602.0 145.346 NA
2003 1694.509 10771 2579.0 160.866 NA
2004 1645.592 10862 2556.0 266.917 NA
$AT
IBM MSFT DELL GOOG CBS
1998 86100 22357 4268 NA 20139
1999 87495 37156 6877 NA 33125
2000 88349 52150 11471 NA NA
2001 88313 59257 13435 NA NA
2002 96484 67646 13535 286.892 NA
2003 104457 79571 15470 871.458 NA
2004 109183 92389 19311 3313.351 NA
The above example actually is a 2x5x7 data.
The key point is I'm trying to find a data structure which can give me the
flexibility to retrieve any data using the names of the dimensions.
Any thoughts will be greally appreciated.
> Brian X. Wu
> ___________________________
>
> This message is intended only for the personal and confidential use of the
> designated recipient or recipients named above. If you are not the intended
> recipient of this message you are hereby notified that any review,
> dissemination, distribution or copying of this message is strictly
> prohibited. This communication is for information purposes only and should
> not be regarded as an offer to sell or as a solicitation of an offer to buy
> any financial product, an official confirmation of any transaction, or as an
> official statement of Guzman & Company. Email transmission cannot be
> guaranteed to be secure or error-free. Therefore, we do not represent that
> this information is complete or accurate and it should not be relied upon as
> such. All information is subject to change without notice.
>
>
>
>
>
|