Hi, I would suggest that this is a question that you should ask your teacher / manager or whoever gave you the work because they set the requirements; what would they like to see if the coordinate values are missing and so cannot be plotted. If this is just some practice work you're doing then I would suggest displaying a clear message that the coordinates could not be used because they had missing values. Otherwise, if you just display an empty set of axes, then there could be some doubt about why there are no plot points on the graph. Using a message makes it clear what has happened. Regards, Amir.
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