Broken `graph_from_graphdb()` example

[maelle]

@szhorvat is this a known problem?

library("igraph")
#> 
#> Attaching package: 'igraph'
#> The following objects are masked from 'package:stats':
#> 
#>     decompose, spectrum
#> The following object is masked from 'package:base':
#> 
#>     union
g <- graph_from_graphdb(
  prefix = "iso", type = "r001", nodes = 20, pair = "A",
  which = 10, compressed = TRUE
)
#> Warning in file(filename, open = "rb"): cannot open URL
#> 'https://wigner.hu/hu/komputacios-tudomanyok-osztalyagraphdb/gzip/iso/rand/r001/iso_r001_s20.A10.gz':
#> HTTP status was '404 Not Found'
#> Error in file(filename, open = "rb") : 
#>   cannot open the connection to 'http://cneurocvs.rmki.kfki.hu/graphdb/gzip/iso/rand/r001/iso_r001_s20.A10.gz'
#> Error in graph_from_graphdb(prefix = "iso", type = "r001", nodes = 20, : Cannot open URL: http://cneurocvs.rmki.kfki.hu/graphdb/gzip/iso/rand/r001/iso_r001_s20.A10.gz

^{Created on 2024-12-10 with reprex v2.1.1}

[szhorvat]

The link is dead. Let's remove the example. GraphDB files are available at https://mivia.unisa.it/datasets/graph-database/arg-database/ but it seems to me that they don't offer direct downloads of individual files, only of a single ZIP file containing multiple instances.

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