regex - building a large xts object out of a list of files with rbind.xts and a user defined function -

i trying create 1 large xts data set out of list of files. able accomplish being explicit shown below, read.cqg user defined function using read.zoo , as.xts read/convert data xts object. each read.cqg call returns xts object.

the code below works , returns large xts object.

large_xts_object <- rbind.xts(read.cqg("somefile01.txt"),                               read.cqg("somefile02.txt"),                               read.cqg("somefile03.txt"),                               read.cqg("somefile04.txt"),                               read.cqg("somefile05.txt"),                               read.cqg("somefile06.txt"),                               read.cqg("somefile07.txt")) 

i use regular expressions , lapply avoid having explicitly write file name. me understand using lapply , shorten code.

this attempt, doesn't give me results want.

large_xts_obj <- rbind.xts(lapply(list.files(pattern="^somefile*.*txt"), read.cqg)) 

this returns large list of xts objects instead of 1 large xts object. how can use rbind.xts, custom read.cqg function, , pattern argument of list.files create single xts object want?

you should not call methods (e.g. rbind.xts) directly. use generic function , let r method dispatch. aside that, code in comment correct.

do.call allows construct , evaluate function call providing function , list of parameters. in case, list of parameters list of xts objects read via read.cqg.

files <- list.files(pattern = "^files*.*txt") xts_object_list <- lapply(files, read.cqg) large_xts_object <- do.call(rbind, xts_object_list)