```r data(dim_example) VelocityPlot(dim_example[, 1:2], dim_example[, 3:4], group_by = dim_example$clusters) ``` ``` Error in vapply(glyph, get_attr, which = "width", default = 0, numeric(1)) : values must be length 1, but FUN(X[[1]]) result is length 200 ``` Related: #19