Small vector into large data frame
Use the p_f numbers as an "index" of spot$pxlast. Suppose your data frame is called mydata, mydata$newvar <- spot$pxlast[mydata$p_f] Jean On Fri, Nov 14, 2014 at 8:48 AM, Francesca Pancotto <
francesca.pancotto at unimore.it> wrote:
Dear Contributors
I seem not to get the general rule applying to the use of loops.
I need some help. I have a database in which i need to generate a variable
according to the following rule.
This is the database head
bank_name date px_last Q_Y p_made p_for p_m p_f
aba.1 ABA 2006-10-24 1.28 p406-q406 406 406 1 1
aba.2 ABA 2006-11-30 1.31 p406-q406 406 406 1 1
aba.3 ABA 2006-10-24 1.29 p406-q107 406 107 1 2
aba.4 ABA 2006-11-30 1.33 p406-q107 406 107 1 2
aba.5 ABA 2006-10-24 1.31 p406-q207 406 207 1 3
aba.6 ABA 2006-11-30 1.35 p406-q207 406 207 1 3
the variable p_f takes values from 1 to 19 in a non regular way.
then I have a vector of 19 elements
spot$pxlast
[1] 1.32 1.34 1.35 1.43 1.46 1.58 1.58 1.41 1.40 1.33 1.40 1.46 1.43 1.35
1.22 1.36 1.34 1.42 1.42
I need to create a variable to attach to the data frame which is composed
of 11500 rows that takes values
1.32 when p_f==1
1.34 when p_f==2
It seems so easy but I cannot find a way to do it in an efficient way.
Thanks in advance for any help.
Francesca
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.