08-10-2010
Quote:
Originally Posted by
rdcwayx
The code will have problem, if some lines don't have same columns.
kurumi's code is still correct in this situation.
Strictly speaking, neither solution correctly handles irregular lengths; properly handling a file with differing row lengths would involve not making any assumptions based on a single row (if row n has more columns than row 1, truncation would occur).
In any case, nothing in the original post implies that rows vary in width. Quite the contrary, the word "matrix" is used, which indicates a rectangular array. Still, it's good that you pointed that out just in case it is a concern.
On a different note, if memory allows, when dealing with a very large dataset, my solution should be much much much faster. Only one instance of awk is needed and the file is only read once. kurumi's will fork-exec 600,000 awk processes and read the file 600,000 times.
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LEARN ABOUT DEBIAN
python-config
PYTHON-CONFIG(1) General Commands Manual PYTHON-CONFIG(1)
NAME
python-config - output build options for python C/C++ extensions or embedding
SYNOPSIS
python-config [ --prefix ] [ --exec-prefix ] [ --includes ] [ --libs ] [ --cflags ] [ --ldflags ] [ --extension-suffix ] [ --configdir ] [
--help ]
DESCRIPTION
python-config helps compiling and linking programs, which embed the Python interpreter, or extension modules that can be loaded dynamically
(at run time) into the interpreter.
OPTIONS
--cflags
print the C compiler flags.
--ldflags
print the flags that should be passed to the linker.
--includes
similar to --cflags but only with -I options (path to python header files).
--libs similar to --ldflags but only with -l options (used libraries).
--prefix
prints the prefix (base directory) under which python can be found.
--exec-prefix
print the prefix used for executable program directories (such as bin, sbin, etc).
--extension-suffix
print suffix used for extension modules (including the _d modified for debug builds).
--configdir
prints the path to the configuration directory under which the Makefile, etc. can be found).
--help print the usage message.
EXAMPLES
To build the singe-file c program prog against the python library, use
gcc $(python-config --cflags --ldflags) progr.cpp -o progr.cpp
The same in a makefile:
CFLAGS+=$(shell python-config --cflags)
LDFLAGS+=$(shell python-config --ldflags)
all: progr
To build a dynamically loadable python module, use
gcc $(python-config --cflags --ldflags) -shared -fPIC progr.cpp -o progr.so
SEE ALSO
python (1)
http://docs.python.org/extending/extending.html
/usr/share/doc/python/faq/extending.html
AUTHORS
This manual page was written by Johann Felix Soden <johfel@gmx.de> for the Debian project (and may be used by others).
November 27, 2011 PYTHON-CONFIG(1)