Change colour of plot when colouring according to a variable

I have some air quality data from a room and an activity log which tells me if anybody was in it.

I have created a plot showing the change in pollution concentration over time and I have coloured the plot according to activity (1 = activity; 0 = no activity).

However, when there is no activity, the plot is yellow - which is hard to see. How do I change this? I have used the following code:

scatter(Table.Date_Time, Table.Concentration, 5, Table.Activity)

Answer 1

[Aghamarsh Varanasi]

Hi,

I understand that you are plotting air quality data using scatter function. You wanted to change the color of the plot based on the value in the variable ‘activity’. You could use the ‘MarkerFaceColor’ and ‘MarkerEdgeColor’ name-value pairs in the scatter function to change the color of your plot.

You could use a if statement to differentiate the activity variable. A sample MATLAB code could be

if activity == 0 
    scatter(Table.Date_Time, Table.Concentration, 5, Table.Activity, 'MarkerFaceColor', 'red'); 
else 
    scatter(Table.Date_Time, Table.Concentration, 5, Table.Activity, 'MarkerFaceColor', 'blue'); 
end 

For further reference on coloring of a scatter plot refer : https://www.mathworks.com/help/matlab/ref/scatter.html