Error with n_components=1

[mbosio85]

Hello,
I am trying to use umap in R and wanted to try editing the configuration n_components to 1.
When I do it I get an error :

custom.config = umap.defaults
custom.config$n_components=1
aa.umap = umap(aa, config = custom.config)
Error in result[, 1:d, drop = FALSE] : incorrect number of dimensions

Is there a way I can extract a reduction to only 1 component ?

Thanks for the info
Mattia

[tkonopka]

Thanks for the report.

In principle, it should be possible to use n_components=1. For example, it works on the iris dataset.

umap(iris[,1:4], n_components=1)

outputs

umap embedding of 150 items in 1 dimensions
object components: layout, data, knn, config

However, there are indeed cases where things break. For example,

umap(iris[1:5,1:4], n_neighbors=3, n_components=1)

outputs an error. I'll post an update...

[tkonopka]

Posted an update that fixes the bug (at least with the example with the iris dataset).

[tkonopka]

I'll take it the patch resolves the original question. But please re-open the issue if you encounter further issues.

Thanks again for reporting the bug.