Is it possible to assign new values which are integers to categorical array?

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Rohit Deshmukh 2020-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/510553-is-it-possible-to-assign-new-values-which-are-integers-to-categorical-array

编辑： dpb 2020-3-12

I want to change the values of categorical array, so that i can create figure from plots.I want to convert the plot into figure. For which i want app.UIAxes.XLim to be numerical not categorical. For example: currently-

app.UIAxes.XLim = 1×2 categorical array -> urban freeway

I want

app.UIAxes.XLim = 1x2 Matrix 2 6

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Walter Roberson 2020-3-12

You cannot convert an existing categorical ruler to numeric ruler. If you have a categorical ruler and need numeric ruler it is typically easiest to destroy the entire axes and recreate it.

In theory you could also just replace the ruler property in the axes. However there are No User Serviceable Parts for creating rulers, so you would have to create another axes with the kind of ruler that you wanted and copy that on top of the existing ruler property.

Walter Roberson 2020-3-12

Traditional figures support categorical rulers by the way, no need to switch to numeric, at least not for the last few years.

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回答（2 个）

Ameer Hamza 2020-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/510553-is-it-possible-to-assign-new-values-which-are-integers-to-categorical-array#answer_419852

在 MATLAB Online 中打开

findgroups is one way to convert categorical array to numeric

numeric = findgroups(categorical_array);

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Walter Roberson 2020-3-12

在 MATLAB Online 中打开

app.UIAxes.XLim = double(app.UiAxes.XLim)

The double will retrieve the numeric encoding associated with the categorical values.

However rulers know the data type the ruler was constructed with and will either refuse to make the change or will convert the values back to the datatype associated with the ruler.

Categorical rulers are a different graphics object than numeric rulers. You cannot change to a numeric ruler just by changing the xlim: you would need to replace the entire ruler.

dpb 2020-3-12

"but i want to convert the plot into figure"

See Walter Roberson's comment above.

If that's not the issue, then explain the reasons behind the request. Doesn't seem rational on the face of it to replace the meaningful categorical names with numbers.

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