21  Common Q & A

This chapter addresses frequently asked questions about FLIM Playground.

Q: Why can’t I find a certain numerical feature under numerical selection/filter widgets?

A: If you cannot find a certain numerical feature, try the following:

• look inside the Uncategorized Features feature group
• inspect the dataset (e.g., using Excel filters) and look for non-numeric values in that column. Stray non-numeric values (e.g., “–”) are tolerated as long as they make up 1% or less of the column’s non-empty values; FLIM Playground converts the column anyway and turns just those cells into NaN, telling you how many it converted. If more than 1% of the column is non-numeric, the column stays as text and will not be recognized. In that case, clear those cells (Excel cells, not real cells), save the file, and upload it again.

Q: Why can’t I find a certain categorical feature under categorical filter/visual channel widgets?

A:

• If the uploaded dataset was extracted by Data Extraction, FLIM Playground will only match categorical features specified in the Data Extraction configuration. Otherwise, FLIM Playground will only match categorical features specified in the configuration.
  • If the categorical feature was in the corresponding configuration, and it is still not visible:
    • If you just added it, FLIM Playground may not have picked it up yet. Try refreshing the page.
    • If you have already added it, then there is only one unique value in that categorical feature column. FLIM Playground will not show it.
• It is ok if your dataset does not have all of the categorical features specified in either of the configurations.

Q: How do I change the FLIM Playground’s display mode (i.e., dark mode or light mode)?

A: FLIM Playground uses the browser’s current display mode. You can change it by going to the browser’s settings and changing the display mode.