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# piping file and providing function

## piping file and providing function

(OP)
Hey,
I guess it is very easy what I am trying to do, but I don't know how...

#### CODE

cat input.dat |awk '{
function acos(x) { return atan2(sqrt(abs(1-x*x)), x) }
function asin(x) { return atan2(x, sqrt(abs(1-x*x))) }
function pi() { return 2*asin(1);}
gamma=acos(($1*$1)/(2*$3*$1))
print gamma
}' 

That was my idea, but of course it doesn't work. Does someone know how to implement functions while piping an file...?
And sorry for the question, but I am not able to solve it... Thanks for any help,
Ergy

### RE: piping file and providing function

The function should be defined outside, eg:

#### CODE

awk '
function acos(x){return atan2(sqrt(abs(1-x*x)),x);}
function asin(x){return atan2(x,sqrt(abs(1-x*x)));}
function pi(){return 2*asin(1);}
{
gamma=acos(($1*$1)/(2*$3*$1))
print gamma
}' input.dat 

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