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AVR Libc AVRLibc

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2 Library Reference
AVR Libc Library Reference
2 <math.h>: Mathematics
2.1 Functions
2.1.25 double log
double log(double __x)

AVRLibc

AVR Libc
1 User Manual
2 Library Reference
AVR Libc Library Reference
- 2 <alloca.h>: Allocate space in the stack
- 2 <assert.h>: Diagnostics
- 2 <avr/boot.h>: Bootloader Support Utilities
- 2 <avr/cpufunc.h>: Special AVR CPU functions
- 2 <avr/eeprom.h>: EEPROM handling
- 2 <avr/fuse.h>: Fuse Support
- 2 <avr/interrupt.h>: Interrupts
- 2 <avr/io.h>: AVR device-specific IO definitions
- 2 <avr/lock.h>: Lockbit Support
- 2 <avr/pgmspace.h>: Program Space Utilities
- 2 <avr/power.h>: Power Reduction Management
- 2 <avr/sfr_defs.h>: Special function registers
- 2 <avr/signature.h>: Signature Support
- 2 <avr/sleep.h>: Power Management and Sleep Modes
- 2 <avr/version.h>: avr-libc version macros
- 2 <avr/wdt.h>: Watchdog timer handling
- 2 <compat/deprecated.h>: Deprecated items
- 2 <compat/ina90.h>: Compatibility with IAR EWB 3.x
- 2 <ctype.h>: Character Operations
- 2 <errno.h>: System Errors
- 2 <inttypes.h>: Integer Type conversions
- 2 <math.h>: Mathematics
  - 2.1 Functions
    - 2.1.1 double cos
      double cos(double __x)
    - 2.1.2 double sin
      double sin(double __x)
    - 2.1.3 double tan
      double tan(double __x)
    - 2.1.4 double fabs
      double fabs(double __x)
    - 2.1.5 double fmod
      double fmod(double __x, double __y)
    - 2.1.6 double modf
      double modf(double __x, double *__iptr)
    - 2.1.7 float modff
      float modff(float __x, float *__iptr)
    - 2.1.8 double sqrt
      double sqrt(double __x)
    - 2.1.9 float sqrtf
      float sqrtf(float)
    - 2.1.10 double cbrt
      double cbrt(double __x)
    - 2.1.11 double hypot
      double hypot(double __x, double __y)
    - 2.1.12 double square
      double square(double __x)
    - 2.1.13 double floor
      double floor(double __x)
    - 2.1.14 double ceil
      double ceil(double __x)
    - 2.1.15 double frexp
      double frexp(double __x, int *__pexp)
    - 2.1.16 double ldexp
      double ldexp(double __x, int __exp)
    - 2.1.17 double exp
      double exp(double __x)
    - 2.1.18 double cosh
      double cosh(double __x)
    - 2.1.19 double sinh
      double sinh(double __x)
    - 2.1.20 double tanh
      double tanh(double __x)
    - 2.1.21 double acos
      double acos(double __x)
    - 2.1.22 double asin
      double asin(double __x)
    - 2.1.23 double atan
      double atan(double __x)
    - 2.1.24 double atan2
      double atan2(double __y, double __x)
    - 2.1.25 double log
      double log(double __x)
    - 2.1.26 double log10
      double log10(double __x)
    - 2.1.27 double pow
      double pow(double __x, double __y)
    - 2.1.28 int isnan
      int isnan(double __x)
    - 2.1.29 int isinf
      int isinf(double __x)
    - 2.1.30 static int isfinite
      static int isfinite(double __x)
    - 2.1.31 static double copysign
      static double copysign(double __x, double __y)
    - 2.1.32 int signbit
      int signbit(double __x)
    - 2.1.33 double fdim
      double fdim(double __x, double __y)
    - 2.1.34 double fma
      double fma(double __x, double __y, double __z)
    - 2.1.35 double fmax
      double fmax(double __x, double __y)
    - 2.1.36 double fmin
      double fmin(double __x, double __y)
    - 2.1.37 double trunc
      double trunc(double __x)
    - 2.1.38 double round
      double round(double __x)
    - 2.1.39 long lround
      long lround(double __x)
    - 2.1.40 long lrint
      long lrint(double __x)
  - 2.2 Defines
- 2 <setjmp.h>: Non-local goto
- 2 <stdint.h>: Standard Integer Types
- 2 <stdio.h>: Standard IO facilities
- 2 <stdlib.h>: General utilities
- 2 <string.h>: Strings
- 2 <time.h>: Time
- 2 <util/atomic.h> Atomically and Non-Atomically Executed Code Blocks
- 2 <util/crc16.h>: CRC Computations
- 2 <util/delay.h>: Convenience functions for busy-wait delay loops
- 2 <util/delay_basic.h>: Basic busy-wait delay loops
- 2 <util/parity.h>: Parity bit generation
- 2 <util/setbaud.h>: Helper macros for baud rate calculations
- 2 <util/twi.h>: TWI bit mask definitions
- 2.1 Structures
3 Example Projects
4 Files

2.1.25 double log

double log(double __x)

The log() function returns the natural logarithm of argument __x.

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