[Rcpp-devel] Please help! A list containing dataframe

[sky Xue]

Hello,

I have a list  below whose elements are data frames (Please see the
attached file “try.dat”).  Now I want to apply a complicated function to
each row of the data frame which returns a single value. For simplicity, you
can assume this function is ma(x) (x is the row of the data frame).  [[1]]
   class_id student_id  1  2
1         1          1  9 14
2         1          2  4  1
3         1          3 10  8
4         1          4  7  7
5         1          5  6 11
6         1          6  1  3
7         1          7 14 10
8         1          8 13 12
9         1          9 12  2
10        1         10  3  9
11        1         11  8  4
12        1         12 11  6
13        1         13  2 13
14        1         14  5  5[[2]]
   class_id student_id  1  2
15        2          1 11  3
16        2          2  7 10
17        2          3  2  2
18        2          4  6  6
19        2          5 13  8
20        2          6 12 13
21        2          7  8 14
22        2          8  1  9
23        2          9  3  1
24        2         10  4 11
25        2         11  5  4
26        2         12  9 12
27        2         13 10  7
28        2         14 14  5[[3]]
   class_id student_id  1  2
29        3          1 12  6
30        3          2  1  3
31        3          3  8  2
32        3          4  9 10
33        3          5 11  7
34        3          6 14  4
35        3          7  2 14
36        3          8 13 13
37        3          9  3  8
38        3         10  5 11
39        3         11  4 12
40        3         12  7  1
41        3         13 10  5
42        3         14  6  9  

     

 

In real situation the list will be very long, and the
dataframe is much wider. That’s why I want  to use Rcpp to improve the
speed.

 

I got stuck from the very beginning, I failed to import this
list to Rcpp, not to mention import the dataframe to Rcpp.

 

I’ve checked the book Seamless R and C++ integration with
Rcpp but find NO example deals with such case.

 

Thank you very much for your support!

 

Best regards,

Sky 

 		 	   		  
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