cirrange

cirrange(number[, max]) → restricted_number

Purpose

Force a number into a given range \([0, \text{max})\).

Argument

• number: the number to modify. Can be a scalar or an array.
• max (optional numerical argument): specify the extremum of the range \([0, \text{max})\) into which the number should be restricted. If omitted, defaults to 360.0.

Output

The converted number or array of numbers, as AbstractFloat.

Example

Restrict an array of numbers in the range \([0, 2\pi)\) as if they are angles expressed in radians:

cirrange([4pi, 10, -5.23], 2.0*pi)
# => 3-element Array{Float64,1}:
#     0.0
#     3.71681
#     1.05319

Notes

This function does not support the radians keyword like IDL implementation. Use 2.0*pi as second argument to restrict a number to the same interval.

Code of this function is based on IDL Astronomy User’s Library.

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rad2sec

rad2sec(rad) → seconds

Purpose

Convert from radians to seconds.

Argument

• rad: number of radians. It can be either a scalar or a vector.

Output

The number of seconds corresponding to rad. If rad is an array, an array of the same length is returned.

Example

rad2sec(1)
# => 206264.80624709636

Notes

Use sec2rad to convert seconds to radians.

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sec2rad

sec2rad(sec) → radians

Purpose

Convert from seconds to radians.

Argument

• sec: number of seconds. It can be either a scalar or a vector.

Output

The number of radians corresponding to sec. If sec is an array, an array of the same length is returned.

Example

sec2rad(3600*30)
# => 0.5235987755982988

Notes

Use rad2sec to convert radians to seconds.