"NNS::PM.matrix - Mean Target - DataFrame"
"NNS::PM.matrix - NULL Target - DataFrame"

LPM(0, NULL, x_df) (`actual`) not equal to 0.49 (`expected`).

`actual` is a list
`expected` is a double vector (0.49)

<Rcpp::not_compatible/C++Error/error/condition>
Error: Not compatible with requested type: [type=list; target=double].

UPM(0, NULL, x) (`actual`) not equal to 0.51 (`expected`).

`actual` is a list
`expected` is a double vector (0.51)

UPM(0, NULL, x_df) (`actual`) not equal to 0.51 (`expected`).

`actual` is a list
`expected` is a double vector (0.51)