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is there something similar to wc for the file class? I read through the Programmer's Reference section, but didn't see anything. All I'm trying to do is initialize a vector to the exact length necessary to read values from a given file of doubles. I can think of several reasonable ways to do it, but it seems like there is probably a really really easy way that I'm missing.

No, but feel free to implement one.

If you're using UNIX/Linux/OS X, or MSWin with an installation of cygwin that includes wc,
you could take advantage of hoc's system() procedure, which makes the OS's shell
execute a command. Also recall that hoc's printf() can be used to assemble command
strings.