Storing mouse click event coordinates in PyPlot window

Specific Domains Visualization
2

It is the famous global scope issue although it seems to be created unnecessarily here.

To assign a global variable within a local scope you need to add the keyword global before the assignments. However, you do not need the assignments after the calls to push!. Therefore simply replacing

    x = push!(x,event[:xdata])
    y = push!(y,event[:xdata])

with

    push!(x,event[:xdata])
    push!(y,event[:xdata])

will make your code work as expected.

In other cases, you either need to use the global keyword or take the global variables as parameters to your functions.

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