At times, a real-life data set may not have all the points — there may be an x-value but the corresponding y-value may be missing for the column you are trying to plot.
有时，真实的数据可能没有包含所有的点——对于要绘图的列，可能有x值，但缺少相应的y值。
Though at first it may not appear like it, this question requires an answer which follows Formula 1: Do you prefer X or y?
虽然刚开始不喜欢，这个问题需要的回答第1高分公式：你是否喜欢X或Y ？
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