Count number of empty cells in a range
I am trying to set Geogebra up so that it graphs everything in a predefined range of cells - even when something is added afterwards.
Example: Students enter x and y values in columns A and B. They enter data down through row 5. The data it automatically graphed - no action required by student because everything is set up ahead of time. Students then come back and enter another data point in row 8 and it needs to be graphed automatically as well - no additional action by the student.
Is that possible? Seems like it should be, but I can't seem to figure it out.
As a follow-up, is there any way to simply count the number of data points in a range when empty cells are part of the range?