• Home
• Julia

cos

cos(x)

Compute cosine of x, where x is in radians

Examples

1. Calculate the cosine of a single value:

   julia> cos(0)
   1.0

   This example calculates the cosine of 0 radians.

2. Evaluate the cosine of an array of values:

   julia> angles = [0, π/4, π/2, π];
   julia> cos(angles)
   4-element Array{Float64,1}:
   1.0
   0.7071067811865476
   6.123233995736766e-17
   -1.0

   It computes the cosine of each angle in the angles array.

3. Calculate the cosine of a variable:

   julia> x = 1.2;
   julia> cos(x)
   0.3623577544766736

   This example calculates the cosine of the variable x.

Common mistake example:

julia> cos("1.5")
ERROR: MethodError: no method matching cos(::String)

In this example, the argument provided to cos is not a valid input. The cos function expects the input to be a numeric value representing radians. Make sure to pass a numeric value as the argument to cos to avoid such errors.

See Also

User Contributed Notes

julia> cos(0.2)
0.9800665778412416

Add a Note

The format of note supported is markdown, use triple backtick to start and end a code block.