Hi,


I'm very new in R, so maybe my question may result very trivial, but I hope
you can help me. I have two data bases, one is a portfolio that posses the
following information:


Stocks  names
Id
Number of Stocks or Position

This portfolio has 16 companies each one with a different id or key

The other data base has:


Id    Date   Last  Low  High Volume

The second data base has about 38 different companies, and they are organize
one after another.

What I want is to take from the second data base, the prices of the
companies that my portfolio contains, selecting by Id without using any
loop. There is already a function in R that allows me to execute this?

And if it's possible, if I have a specific date (e.g today) of my portfolio
and I want to pull out from that date until the oldest one o until another
date in the past, what  can I do to perform this simultaneously with the
last query? What time series structure do you recomend?

Any advice or documentation where I can find either the function or the
programming code to perform such queries, will be really appreciate.

One last thing, there is any documentation where i can find how to translate
Matlab code into R code reffering financial and portfolio functions.

I will really appreciate any help you can provide,

-- 
Manuel Serna Cortés
Estudiante de Economía y Negocios Internacionales
Universidad Icesi

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