converting categorical array to cell array

Question

Boy 2016-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/277967-converting-categorical-array-to-cell-array

编辑： cui,xingxing 2024-4-27，2:05

Hi all, I am trying to convert a categorical array to a cell array so that I can use the strrep function, but i cant seem to find anyway to do it after scouring the web to the best of my abilities. My categorical column contains string that have the '_' character and i want to search the column and replace any string that has '_' with '-'. Is there any way I can do it without converting the datatype? Any help would be greatly appreciated. Thank you

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Answer 1

Fangjun Jiang 2016-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/277967-converting-categorical-array-to-cell-array#answer_217073

在 MATLAB Online 中打开

a=nominal({'R_','G_','B_'});
b=cellstr(a);
c=strrep(b,'_','-');
d=nominal(c)

d =

R- G- B-

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Boy 2016-4-8

移动：Fangjun Jiang 2024-1-8

Thank you for the quick response Fangjun. But i have a dataset where column 3 is nominal datatype. Can i change the entire column from nominal to cell array? Thank You

Salma Hassan 2017-12-24

移动：Fangjun Jiang 2024-1-8

C = cellstr(A) check this link https://www.mathworks.com/help/matlab/ref/cellstr.html

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Answer 2

cui,xingxing 2024-1-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/277967-converting-categorical-array-to-cell-array#answer_1384311

编辑：cui,xingxing 2024-4-27，2:05

在 MATLAB Online 中打开

@Fangjun Jiang update new workflow.

a=categorical({'R_','G_','B_'});
b=string(a);
c=replace(b,'_','-');
d=categorical(c)
d = 1×3 categorical array
     R-      G-      B- 

BTW, Convert categorical array to cell array in general way Example.

A = categorical(["A","B","C","D","hello","world"]) % categorical array
A = 1×6 categorical array
     A      B      C      D      hello      world 
dst = num2cell(A) % cell array
dst = 1×6 cell array
    {[A]}    {[B]}    {[C]}    {[D]}    {[hello]}    {[world]}

if A is a complex arrays,also can use mat2cell function.

A = categorical(["A","B","Hello","world .";
    "1","2","3","四"])
A = 2×4 categorical array
     A      B      Hello      world . 
     1      2      3          四      
dst = mat2cell(A,[1,1],[2,1,1])
dst = 2×3 cell array
    {[A    B]}    {[Hello]}    {[world .]}
    {[1    2]}    {[3    ]}    {[四     ]}

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