using accumarray to combine text

Question

Pete sherer 2022-1-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1636885-using-accumarray-to-combine-text

回答： Stephen23 2022-8-22

采纳的回答： Stephen23

在 MATLAB Online 中打开

Hi,

I am trying to use accumarray to concatenate string.

tdata = table([ 1 2 2 3 4 2]', ["a","b","c","d","e","f"]', 'VariableNames',{'EBID','Name'});
[uniqEBID,~,JGrp] = unique( tdata(:, {'EBID'}));
joinStr = @(tStr) { sprintf([repmat('%s|| ', 1, length( tStr)-1) '%s'], string( tStr))};
joinStr( tdata.Name) % anonymous function seems to do the job

However when running script below, i got error message

accumarray( JGrp, tdata.Name, [], joinStr)

Error using accumarray

Second input VAL must be a full numeric, logical, or char vector or scalar.

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Pete sherer 2022-8-22

the answer should be

"a"

"b|| c|| f"

"d"

"e"

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Answer 1

Stephen23 2022-8-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1636885-using-accumarray-to-combine-text#answer_1030720

在 MATLAB Online 中打开

T = table([1;2;2;3;4;2], ["a";"b";"c";"d";"e";"f"], 'VariableNames',{'EBID','Name'})
T = 6×2 table
    EBID    Name
    ____    ____

     1      "a" 
     2      "b" 
     2      "c" 
     3      "d" 
     4      "e" 
     2      "f" 
G = findgroups(T.EBID);
F = @(s)join(s,"||");
S = splitapply(F,T.Name,G)
S = 4×1 string array
    "a"
    "b||c||f"
    "d"
    "e"

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Answer 2

Voss 2022-1-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1636885-using-accumarray-to-combine-text#answer_882565

在 MATLAB Online 中打开

Does this do what you want?

tdata = table([ 1 2 2 3 4 2]', ["a","b","c","d","e","f"]', 'VariableNames',{'EBID','Name'});
[uniqEBID,~,JGrp] = unique( tdata(:, {'EBID'}));
joinStr = @(tStr) { sprintf([repmat('%s|| ', 1, length( tStr)-1) '%s'], string( tStr))};
% joinStr( tdata.Name) % anonymous function seems to do the job
joinStr( tdata.Name(JGrp))
ans = 1×1 cell array
    {'a|| b|| b|| c|| d|| b'}