How to split the numerical data using discretize Function

Question

Deborah Johnson 2022-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/1763210-how-to-split-the-numerical-data-using-discretize-function

编辑： Deborah Johnson 2022-7-20

discretize.jpg

My first step was to plot the Weekday of Month data as numerical values 1 - 7 which I have attached and the task was successful.

With the second step, I am attempting to "discretize" >> Weekday of Month and split the numerical data into seven groups that corrlates with each weekday value of 1 as Sunday, 2 as Monday, etc. and the new column data states Sunday for 1, etc in the table.

flights.WEEKDAY_LABEL = discretize(flights.WEEKDAY_OF_MONTH,[1, 2, 3, 4, 5, 6, 7], "categorical",["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"])

Error states: "Fourth agrument, category names, must be a cell array with length equal to the number of bins, 6." What is incorrect?

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Answer 1

dpb 2022-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/1763210-how-to-split-the-numerical-data-using-discretize-function#answer_1010410

编辑：dpb 2022-7-19

在 MATLAB Online 中打开

discretize uses bin edges, not bin centers so your seven values define six bins, not seven, annoying as that is as compared to the venerable histc

Try

flights.WEEKDAY_LABEL=discretize(flights.WEEKDAY_OF_MONTH,(1:8),"categorical",["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]);