Is there a way to display:

- The total number of inputs in an aggregated list
- The number of inputs that meet a certain criteria, i.e. >0

I managed to take copy someone else’s activity to create a dotplot aggregated from class data. What I would like to do next is have a 3rd screen display the two things listed above so that students can calculate proportions. My search so far has indicated it would need to be done in a graph, but I can’t figure out what the specific commands in the graph need to be.

For the first one, if your aggregated list is `L`

then `length(L)`

gives you the total number of inputs!

In the same way you can put specific indices into square brackets and pull out individual elements from a list, you can put a condition to *filter* the list: `L[L>0]`

will be all entries of `L`

where `L>0`

is true. Wrap that in a `length`

, and you have the number of inputs that are positive!

(Alternatively, you could straight calculate `total({L>0:1,0})`

, but I’m a fan of filtering.)

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Thanks, that was perfect!