<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">I’m getting a weird sporadic error when I follow the bioconductor vignette for biomaRt - see the dialogue in R below - the hsapiens_gene_ensembl dataset simply vanishes sometimes. Rerunning the line "human = useDataset("hsapiens_gene_ensembl",mart=ensembl)” works sometimes and fails others. I thought I was going mad for a bit because the dataset would "come back” sporadically and I couldn’t work out what I had changed. </div><div class=""><br class=""></div><div class="">The biomaRt vignette records (about) 92 datasets returned in the main mart, and during the ‘failures' I only see 72, so there seem to be a bunch dropping out, for no apparent reason? Any insight appreciated. Note: I have tried this against archive hosts as well (e.g. <a href="http://apr2018.archive.ensembl.org" class="">apr2018.archive.ensembl.org</a>) and the same thing happens. Is anyone else able to reproduce this?</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Vivek</div><div class=""><br class=""></div><div class="">library(“biomaRt")<div class="">listMarts()</div></div><div class=""><br class=""></div><div class="">ensembl=useMart("ensembl")</div><div class="">View(listDatasets(ensembl))</div><div class=""><br class=""></div><div class="">dim(listDatasets(ensembl))</div><div class=""><b class="">[1] 72 3</b></div><div class=""><br class=""></div><div class="">library(dplyr)</div><div class=""><br class=""></div><div class=""> listDatasets(ensembl) %>% filter(dataset=="hsapiens_gene_ensembl")<br class="">[1] dataset description version <br class=""><b class=""><0 rows> (or 0-length row.names)</b></div><div class=""><br class=""></div><div class="">> human = useDataset("hsapiens_gene_ensembl",mart=ensembl)<br class="">Error in useDataset("hsapiens_gene_ensembl", mart = ensembl) : <br class=""> The given dataset: hsapiens_gene_ensembl , is not valid. …</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>