It's not corect. Vector with length 15*10^6 you could store in memory without
ff packages.
For vector 15*10^7
k=bit(15*10^7)
a=ff(2,15*10^7)
system.time(k<-a[,chunk(1,length.ff(a),1e4)]<1)
Error: cannot allocate vector of size 572.2 Mb
In addition: Warning messages:
1: In system.time(k <- a[
Yes, it's necessery. Operator < is not definied in ff packages.
str(a<1)
logi(0)
Mayby it's possible to do the same thing easier...
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I want to do operation with ff vector from packages ff like simple operation
in R like this. (I have read data from file)
Example
a=1:10
b=a[a>5]
how to do this operation with ff packages:
Example :
a=ff(1, length=15*10^7)
I know that I could get logical vector like this:
k=bit(15*10^7) # from
I solved this problem using Sys.getpid() function.
zz <- file(paste(cmd_args[7],Sys.getpid(),".txt",sep=""), "at")
write(rr,file=zz)
close(zz)
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Dear list,
I am using the foreach/doSNOW packages. I want to compute some data parallel
and save results in every iteration into a text or CSV file, but then I see
in file there are some errors (some data is not saved to file and there are
empty lines). I have tested every function to append dat
