User:Airpmb/sandbox

Getting Help

In MATLAB, the `help` command provides brief help on a given command/function, e.g.:

```>> help sin

sin    Sine of argument in radians.

sin(X) is the sine of the elements of X.

Reference page for sin```

In Julia, to get help, press the ? key in the REPL (or IJulia) at the start of a line, which switches the prompt to `help?>` . Type the name of a function and press ↵ Enter to show help for that function. Let's try help for the `sin` function:

```help?> sin
search: sin sinh sind sinc sinpi sincos asin using isinf asinh asind isinteger

sin(x)

Compute sine of x, where x is in radians.

─────────────────────────────────────────────────────────────────────────────────

sin(A::AbstractMatrix)

Compute the matrix sine of a square matrix A.

If A is symmetric or Hermitian, its eigendecomposition (eigen) is used to compute
the sine. Otherwise, the sine is determined by calling exp.

Examples
≡≡≡≡≡≡≡≡≡≡

julia> sin(fill(1.0, (2,2)))
2×2 Array{Float64,2}:
0.454649  0.454649
0.454649  0.454649```