# __tanpi(3) [mojave man page]

__TANPI(3)						   BSD Library Functions Manual 						__TANPI(3)

NAME
__tanpi -- tangent-pi function SYNOPSIS
#include <math.h> float __tanpif(float x); double __tanpi(double x); DESCRIPTION
The __tanpi() function returns the tangent of pi times x (measured in radians). This can be computed more accurately than tan(M_PI * x), because it can implicitly use as many bits of pi as are necessary to deliver a well-rounded result, instead of the 53-bits to which M_PI is limited. For large x it may also be more efficient, as the argument reduction involved is significantly simpler. This function may be especially useful for working with degrees; whereas tan(M_PI * x / 180.0) cannot produce exact results for angles that naively "should" be exact, like 90 degrees, __tanpi(x / 180.0) can be computed exactly. SPECIAL VALUES
__tanpi(-x) is the same as - __tanpi(x) for any finite x. __tanpi(+-0) returns +-0. __tanpi(n) returns +0 for any positive even integer n. __tanpi(n) returns -0 for any positive odd integer n. __tanpi(n + 0.5) returns +infinity for any even integer n. __tanpi(n + 0.5) returns -infinity for any odd integer n. __tanpi(+-infinity) raises the invalid floating-point exception and returns NaN. VECTOR OPERATIONS
If you need to apply the __tanpi() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may be useful: #include <Accelerate/Accelerate.h> vFloat vtanpif(vFloat x); void vvtanpif(float *y, const float *x, const int *n); void vvtanpi(double *y, const double *x, const int *n); SEE ALSO
__cospi(3), __sinpi(3), __sincospi(3), math(3) BSD
December 15, 2012 BSD

## Check Out this Related Man Page

__TANPI(3)						   BSD Library Functions Manual 						__TANPI(3)

NAME
__tanpi -- tangent-pi function SYNOPSIS
#include <math.h> float __tanpif(float x); double __tanpi(double x); DESCRIPTION
The __tanpi() function returns the tangent of pi times x (measured in radians). This can be computed more accurately than tan(M_PI * x), because it can implicitly use as many bits of pi as are necessary to deliver a well-rounded result, instead of the 53-bits to which M_PI is limited. For large x it may also be more efficient, as the argument reduction involved is significantly simpler. This function may be especially useful for working with degrees; whereas tan(M_PI * x / 180.0) cannot produce exact results for angles that naively "should" be exact, like 90 degrees, __tanpi(x / 180.0) can be computed exactly. SPECIAL VALUES
__tanpi(-x) is the same as - __tanpi(x) for any finite x. __tanpi(+-0) returns +-0. __tanpi(n) returns +0 for any positive even integer n. __tanpi(n) returns -0 for any positive odd integer n. __tanpi(n + 0.5) returns +infinity for any even integer n. __tanpi(n + 0.5) returns -infinity for any odd integer n. __tanpi(+-infinity) raises the invalid floating-point exception and returns NaN. VECTOR OPERATIONS
If you need to apply the __tanpi() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may be useful: #include <Accelerate/Accelerate.h> vFloat vtanpif(vFloat x); void vvtanpif(float *y, float *x, const int n); void vvtanpi(double *y, double *x, const int n); SEE ALSO
__cospi(3), __sinpi(3), __sincospi(3), math(3) BSD
December 15, 2012 BSD
Man Page

## Split large xml into mutiple files and with header and footer in file

Split large xml into mutiple files and with header and footer in file tried below it splits unevenly and also i need help in adding header and footer command : csplit -s -k -f my_XML_split.xml extrfile.xml "/<Document>/" {1} sample xml <?xml version="1.0" encoding="UTF-8"?><Recipient>...

## Instructions to Clear Data Cache in Safari, Chrome, Firefox, Opera Browsers (Pictures)

Here are instructions to clear the data cache for four browsers, Safari, Chrome, Firefox, Opera. In these examples I'm using MacOS Mojave, but it should be similar for any OS. You can use these instructions to to clear and reload the cache if you have any issues with the Vue.js UserCP (current...

## 12-Core MacPro (2013) kernel_task over 1200%

Yesterday someone asked me to install TeamViewer and share my Mac screen with them while on a conference call. I shut down my Mac before sleeping and woke up to some major problem with my 12-core CPU in hyperdrive, and the system activity monitor showed my Mac kernel_task was at 1,200% and the...

## Shopt -s histappend

What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file. # When the shell exits, append to the history file instead of overwriting it shopt -s histappend

## Cannot extract libraries using sed

Hi, I am attempting to extract the /lib/ paths using sed but it does not appear to work. ./copy_chroot_lib.sh ls echo | sed s#*\(/lib\).*#\1#g linux-vdso.so.1 (0x00007fff77df1000) libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f28190ac000) ...

## UNIX tool on MacOS that can increase resolution of a file

hi, I am searching for a native tool on MacOS that can increase the resolution of a group of image files whose aspect ratios (file width versus height) vary widely. There are numerous files so I don't wish to do this manually. Someone suggested the sips command with the resampling option but...

## Controlling user input

I'm trying to use a bash script for a psych experiment that involves listening to sound files and responding. If I have something like the code below, how can I make sure that a key press is assigned to RESPONSE only after the second echo statement? for i in 1 2 3; do echo "Ready?" sleep 2 ...

## My first PERL incarnation... Audio Oscillograph

Hi all... Well guys and gals, I jumped in at the deep end and found things that PERL cannot do by default. Many tricky terminal escape codes are not catered for so I had to create workarounds. One thing I searched for was this: Passing perl variable to shell command AND, @Neo this was...

## Python 3.8.0rc1 released.

Python 3.8.0rc1 released today, 1st October 2019... Just tried it out testing my AMIGA Python 1.4.0 code inside it and all are working, I can now test to the latest Python incarnation now. Subjective opinion is that is seems seriously quick on my OSX 10.14.6, latest Mojave update. Python...

## [BASH] eval command not expanding variables as expected.

Hi Guys, I wrote a collection of bash functions years ago and now need to use them again but I'm getting some error messages when eval tries to expand the variables names. I recollect that I used the shopt command to set one of the options but I can't quite remember the command that I...

## How can I direct messages from mac console.app to a log file?

I'm trying to complete a bash script to capture if an external webcam is active in a video conference session. Some users will switch the camera to the built-in MAC camera. When this happens I want to trigger a set of events. Things tried: reviewed the console.app to look for patterns on when...