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Checking if a double (or float) is NaN in C++
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According to the IEEE standard, NaN values have the odd property that comparisons involving them are always false. That is, for a float f, f != f will be true only if f is NaN.
Note that, as some comments below have pointed out, not all compilers ...
Ternary operator (?:) in Bash
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why the [[ and ]] ? it works just as well like this : [ $b = 5 ] && a="$c" || a="$d"
– kdubs
Oct 29 '14 at 14:57
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Share Large, Read-Only Numpy Array Between Multiprocessing Processes
... between 5+ multiprocessing Process objects. I've seen numpy-sharedmem and read this discussion on the SciPy list. There seem to be two approaches-- numpy-sharedmem and using a multiprocessing.RawArray() and mapping NumPy dtype s to ctype s. Now, numpy-sharedmem seems to be the way to g...
fs: how do I locate a parent folder?
... answered Aug 16 '11 at 18:22
Andrew HareAndrew Hare
310k6363 gold badges611611 silver badges614614 bronze badges
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How do you scroll up/down on the Linux console?
I recognize that Up / Down will give you the command history. But, how do you look at past output by scrolling up and down?
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Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...让我们看看edit的规则：
insert.osearch.o files.o utils.o
edit : $(objects)
main.o : main.c defs.h
kbd.o : kbd.c defs.h command.h
command.o : command.c defs.h command.h
display.o : display.c defs.h buffer.h
insert.o : insert.c defs....
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...让我们看看edit的规则：
insert.osearch.o files.o utils.o
edit : $(objects)
main.o : main.c defs.h
kbd.o : kbd.c defs.h command.h
command.o : command.c defs.h command.h
display.o : display.c defs.h buffer.h
insert.o : insert.c defs....
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...让我们看看edit的规则：
insert.osearch.o files.o utils.o
edit : $(objects)
main.o : main.c defs.h
kbd.o : kbd.c defs.h command.h
command.o : command.c defs.h command.h
display.o : display.c defs.h buffer.h
insert.o : insert.c defs....
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...让我们看看edit的规则：
insert.osearch.o files.o utils.o
edit : $(objects)
main.o : main.c defs.h
kbd.o : kbd.c defs.h command.h
command.o : command.c defs.h command.h
display.o : display.c defs.h buffer.h
insert.o : insert.c defs....
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...让我们看看edit的规则：
insert.osearch.o files.o utils.o
edit : $(objects)
main.o : main.c defs.h
kbd.o : kbd.c defs.h command.h
command.o : command.c defs.h command.h
display.o : display.c defs.h buffer.h
insert.o : insert.c defs....