search for: laf_open_csv

Dear all: I have two larges files with 2000 columns. For each file I am performing a loop to extract the "i"th element of each file and create a data frame with both "i"th elements in order to perform further analysis. I am not extracting all the "i"th elements but only certain which I am indicating on a vector called "d". See an example of my code below

...t into memory, methods are provided to access and process file blockwise. Furthermore, an opened file can be indexed as one would a data.frame. In this way subsets. or specific columns can be read into memory. For example, assuming that an object laf has been created using one of the functions laf_open_csv or laf_open_fwf, the third column from the file can be read into memory using: > col <- laf[,3] The LaF-manual vignette contains a description of all functionality provided: http://laf-r.googlecode.com/files/LaF-manual_0.3.pdf The Laf-benchmark vignette compares the performance of...

...t into memory, methods are provided to access and process file blockwise. Furthermore, an opened file can be indexed as one would a data.frame. In this way subsets. or specific columns can be read into memory. For example, assuming that an object laf has been created using one of the functions laf_open_csv or laf_open_fwf, the third column from the file can be read into memory using: > col <- laf[,3] The LaF-manual vignette contains a description of all functionality provided: http://laf-r.googlecode.com/files/LaF-manual_0.3.pdf The Laf-benchmark vignette compares the performance of...