I have a data of time, X, Y and speed. firstly I'm looking for a way to draw a 2D graph with only X and Y with colorbar related to the high number of X and Y and low number of X and Y (i.e. X and Y are coordinates of people therefore the graph should be heat or density). I'm not sure if this can be done with only X and Y, so I think I need to create a function of Z that should calculate the number of people at each location, but since the coordinates are not repititive hence a range of space should be used. I couldn't perform any code that can show me anything close, I wish that someone can help me with this. Note that I have already tried the grouptransform function and found that all my data are unique.