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#1




awk and trig functions
dear all,
In my script, it would be ideal if I could use an arccos (inverse cos) function. I think trig functions are indeed provided by awk, but not inverse trig functions. So my question simply is: are there any alternative ways to incorporate inverse trig functions into a script? Any help greatly appreciated! Many thanks, pauli 
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#2




look here or here or here Code:
function asin(x) { return atan2(x, sqrt(1x*x)) } function acos(x) { return atan2(sqrt(1x*x), x) } function atan(x) { return atan2(x,1) } Last edited by vgersh99; 07032009 at 09:47 AM.. 
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#3




Hello,
I want to calculate distance between two GPS coordinates(Latitude A, Longitude A, Latitude B, Longitude B). By Spherical Law, the formula is: distance= ACOS ( SIN(latA) * SIN(latB) + COS(latA) * COS(latB) * COS(longBLongA)) * R where R= Radius of the earth(6371) As there is no ACOS function in awk, therefore I have to use the following method: function acos(x) { return atan2(sqrt(1x*x), x) } value = sin(latA) * sin(latB) + cos(latA) * cos(latB) * cos(longBLongA) distance = acos(value)*R But I don't know when I calculate the distance using this method, I get different value from Spherical law formula. For Spherical Law I use MS Excel to calculate the value. I need your help please.Thanks a lot. Regards, Ubee 
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