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。

youdao

According to Goodwin, a customer's checking his bank balance is a great cross-selling lead (awaiting a year-end bonus, perhaps?), and cost-conscious banks that forward callers to outsourced operators may be missing the plot.

FORBES: Magazine Article

Three families are hoping the exhumation of a burial plot in North Lanarkshire can lay to rest a 55-year-old mystery over a missing schoolgirl.

BBC: Glasgow & West Scotland