initialInputCheck: Initial Input Check of Spot Configuration
In bartzbeielstein/SPOT: Sequential Parameter Optimization Toolbox

This function takes the same inputs as given to the spot call and checks for possible problems in the users configuration

initialInputCheck(
  x = NULL,
  fun,
  lower,
  upper,
  control = list(),
  inSpotLoop = F
)

`x`	is an optional start point (or set of start points), specified as a matrix. One row for each point, and one column for each optimized parameter.
`fun`	is the objective function. It should receive a matrix x and return a matrix y. In case the function uses external code and is noisy, an additional seed parameter may be used, see the `control$seedFun` argument below for details.
`lower`	is a vector that defines the lower boundary of search space. This determines also the dimensionality of the problem.
`upper`	is a vector that defines the upper boundary of search space.
`control`	is a list with control settings for spot. See `spotControl`.