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Hi, I am developing a tool for converting a large data frame stored in an uncompressed binary (XDR) RData file to a delimited text file. The data frame is too large to load() and extract rows from on a typical PC. I'm looking to parse through the file and extract individual entries without loading the whole thing into memory. In terms of some C source functions, instead of doing

Currently, I load the RData file then ls() and str(). But loading the file takes too long if the file is big. Most of the time, I only interested what the variables are in the the file and the attributes of the variables (like if it is a data.frame, matrix, what are the colnames/rownames, etc.) I'm wondering if there is any facility in R to help me avoid loading the whole file.

...l"); + else { + dup2 (fd, STDOUT_FILENO); + close (fd); + } +} + /* Remote control server. */ void rc_listen (void) @@ -56,7 +175,7 @@ rc_listen (void) char sockpath[128]; pid_t pid; struct sockaddr_un addr; - int sock, s, i, fd; + int sock, s, i; FILE *fp; XDR xdr, xdr2; guestfish_hello hello; @@ -111,13 +230,7 @@ rc_listen (void) /* Now close stdout and substitute /dev/null. This is necessary * so that eval `guestfish --listen` doesn't block forever. */ - fd = open ("/dev/null", O_WRONLY); - if (fd == -1) - perror ("/dev/nul...

...t; argc; ++i) - fprintf (stderr, " %s", argv[i]); - fprintf (stderr, "\n"); - } - - /* Run the command. */ - reply.r = issue_command (call.cmd, argv, NULL); - - xdr_free ((xdrproc_t) xdr_guestfish_call, (char *) &call); - - /* Send the reply. */ - xdrstdio_create (&xdr2, fp, XDR_ENCODE); - (void) xdr_guestfish_reply (&xdr2, &reply); - xdr_destroy (&xdr2); - - /* Exit on error? */ - if (call.exit_on_error && reply.r == -1) { - unlink (sockpath); - exit (1); - } + /* We have to extend and NULL-terminate the argv array. */ + argc...