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i don't know, but try it with the "array size" function... a xy-graph is a 1d-array of clusters. in these clusters there are two 1d-array which represent x and y coords. the "array size" function should return the number of plots (clusters) of the xy-graph.... try it and let me know if it works..
Hello! you also can use Active Plot property in writing mode. When you active a plot that doesn't exist, the property node returns an error, so that you can know how many plots are in the graph. crisR