How to Convert from Degrees to Radians

How to convert from degrees to radians in 2 out of 3 columns of a table?

IIUC you can just do:

DF4['latitude'] = deg_to_rad(DF4['latitude'])
DF4['longitude'] = deg_to_rad(DF4['longitude'])

You're not assigning back the result of your function

you take a reference here:

DEG_TO_RAD_ATTEMPT_LATITUDE = DF4['latitude']

you then pass it to your function which will return the result but this isn't being assigned to anything, nor is it modifying the passed in column

Also you can use np.deg2rad to achieve the same:

import numpy as np

DF4['latitude'] = np.deg2rad(DF4['latitude'])
DF4['longitude'] = np.deg2rad(DF4['longitude'])

How can I convert from degrees to radians?

Xcode 11 • Swift 5.1 or later

extension BinaryInteger {
    var degreesToRadians: CGFloat { CGFloat(self) * .pi / 180 }
}

extension FloatingPoint {
    var degreesToRadians: Self { self * .pi / 180 }
    var radiansToDegrees: Self { self * 180 / .pi }
}

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Playground

45.degreesToRadians         // 0.7853981633974483

Int(45).degreesToRadians    // 0.7853981633974483
Int8(45).degreesToRadians   // 0.7853981633974483
Int16(45).degreesToRadians  // 0.7853981633974483
Int32(45).degreesToRadians  // 0.7853981633974483
Int64(45).degreesToRadians  // 0.7853981633974483

UInt(45).degreesToRadians   // 0.7853981633974483
UInt8(45).degreesToRadians  // 0.7853981633974483
UInt16(45).degreesToRadians // 0.7853981633974483
UInt32(45).degreesToRadians // 0.7853981633974483
UInt64(45).degreesToRadians // 0.7853981633974483

Double(45).degreesToRadians    // 0.7853981633974483
CGFloat(45).degreesToRadians   // 0.7853981633974483
Float(45).degreesToRadians     // 0.7853981
Float80(45).degreesToRadians   // 0.78539816339744830963

If you would like to make the binary integer return a floating point type instead of always returning a CGFloat you can make a generic method instead of a computed property:

extension BinaryInteger {
    func degreesToRadians() -> F {  F(self) * .pi / 180 }
}

---

let radiansDouble: Double = 45.degreesToRadians()   // 0.7853981633974483
let radiansCGFloat: CGFloat = 45.degreesToRadians() // 0.7853981633974483
let radiansFloat: Float = 45.degreesToRadians()     // 0.7853981
let radiansFloat80: Float80 = 45.degreesToRadians() // 0.78539816339744830963

What is the method for converting radians to degrees?

radians = degrees * (pi/180)

degrees = radians * (180/pi)

As for implementation, the main question is how precise you want to be about the value of pi. There is some related discussion here

Python: Converting degrees to radians - Not working

python math.cos expects angle in radian. so you first have to change degrees to radians.

radian = math.radians(30)
print(math.cos(radian))
# 0.866025403784

Convert radians to degree / degree to radians

The comment of Pascal was very useful and I found several ones, e.g.

install.packages("NISTunits", dependencies = TRUE)
library(NISTunits)

NISTdegTOradian(180)
NISTradianTOdeg(pi)

Convert degree to radians in ruby

Just the same way you convert degrees to radians in real life:

radians = degrees * Math::PI / 180 

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