Query a single igraph parameter

Retrieve the current value of one igraph option set via igraph_options().

Usage

igraph_opt(x, ..., default = NULL)

Arguments

x

A character string holding an option name.

...

These dots are for future extensions and must be empty.

default

If the specified option is not set in the options list, this value is returned. This facilitates retrieving an option and checking whether it is set and setting it separately if not.

Value

The current value set for option x, or NULL if the option is unset.

See also

Similar to getOption(). See igraph_options() to set options.

Other igraph options: igraph_options(), with_igraph_opt()

Author

Gabor Csardi csardi.gabor@gmail.com

Examples

oldval <- igraph_opt("verbose")
igraph_options(verbose = TRUE)
layout_with_kk(make_ring(10))
#> Make graph external pointer.
#> Materializing 'from' vector.
#> Materializing 'to' vector.
#>             [,1]         [,2]
#>  [1,]  1.1483519 -0.003216317
#>  [2,]  0.9291475  0.676715503
#>  [3,]  0.3521535  1.097946790
#>  [4,] -0.3622379  1.099581508
#>  [5,] -0.9411536  0.680995251
#>  [6,] -1.1634674  0.002073742
#>  [7,] -0.9442631 -0.677858079
#>  [8,] -0.3672691 -1.099089365
#>  [9,]  0.3471224 -1.100724083
#> [10,]  0.9260381 -0.682137826
igraph_options(verbose = oldval)