NAN(3) BSD Library Functions Manual NAN(3)NAME
nan, nanf, nanl -- quiet NaNs
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
nan(const char *s);
float
nanf(const char *s);
long double
nanl(const char *s);
DESCRIPTION
The NAN macro expands to a quiet NaN (Not A Number). Similarly, each of the nan(), nanf(), and nanl() functions generate a quiet NaN value
without raising an invalid exception. The argument s should point to either an empty string or a hexadecimal representation of a non-nega-
tive integer (e.g., "0x1234".) In the latter case, the integer is encoded in some free bits in the representation of the NaN, which some-
times store machine-specific information about why a particular NaN was generated. There are 22 such bits available for float variables, 51
bits for double variables, and at least 51 bits for a long double. If s is improperly formatted or represents an integer that is too large,
then the particular encoding of the quiet NaN that is returned is indeterminate.
COMPATIBILITY
Calling these functions with a non-empty string isn't portable. Another operating system may translate the string into a different NaN
encoding, and furthermore, the meaning of a given NaN encoding varies across machine architectures. If you understood the innards of a par-
ticular platform well enough to know what string to use, then you would have no need for these functions anyway, so don't use them. Use the
NAN macro instead.
SEE ALSO fenv(3), ieee(3), isnan(3), math(3), strtod(3)STANDARDS
The nan(), nanf(), and nanl() functions and the NAN macro conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD December 16, 2007 BSD
Check Out this Related Man Page
NAN(3) BSD Library Functions Manual NAN(3)NAME
nan, nanf, nanl -- quiet NaNs
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
nan(const char *s);
float
nanf(const char *s);
long double
nanl(const char *s);
DESCRIPTION
The NAN macro expands to a quiet NaN (Not A Number). Similarly, each of the nan(), nanf(), and nanl() functions generate a quiet NaN value
without raising an invalid exception. The argument s should point to either an empty string or a hexadecimal representation of a non-nega-
tive integer (e.g., "0x1234".) In the latter case, the integer is encoded in some free bits in the representation of the NaN, which some-
times store machine-specific information about why a particular NaN was generated. There are 22 such bits available for float variables, 51
bits for double variables, and at least 51 bits for a long double. If s is improperly formatted or represents an integer that is too large,
then the particular encoding of the quiet NaN that is returned is indeterminate.
COMPATIBILITY
Calling these functions with a non-empty string isn't portable. Another operating system may translate the string into a different NaN
encoding, and furthermore, the meaning of a given NaN encoding varies across machine architectures. If you understood the innards of a par-
ticular platform well enough to know what string to use, then you would have no need for these functions anyway, so don't use them. Use the
NAN macro instead.
SEE ALSO fenv(3), ieee(3), isnan(3), math(3), strtod(3)STANDARDS
The nan(), nanf(), and nanl() functions and the NAN macro conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD December 16, 2007 BSD
Hi,
I have a file which computes fields number and some column produced "nan"
I would like to convert the "nan" value to 0 basically.
q=`echo $i $j |awk '{printf("%f",($2/($1+$2)))}'
The above is the command which I use for computation. However, I would
like to check if $1 and $2 is 0, it... (1 Reply)
Hello,
I am pasting two tables of 6x4 and 4x4 together to get a 10x8 output. I want to fill the blank values with a NaN (Not a Number). How can I do this?
Thanks,
Guss (3 Replies)
I am trying to detect 'nan' (not a number) string in my large txt file filled with lots of numbers. A file may have no or many 'nan'. It should be simple but getting errors. Any help appreciated. Here is what I have:
#!/bin/tcsh
set case1 = test0.txt
set chk = `grep 'nan' $case1`
set op =... (4 Replies)
I am confused by the value of "currdisk->currangle" after adding operation. Initially the value of "currdisk->currangle" is 0.77500000000000013, but after adding operation, it's changed to "-nan(0x8000000000000)", Can anyone explain ? Thanks! The following is the occasion of gdb debugging.
3338 ... (8 Replies)