using accumarray to combine text

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Pete sherer
Pete sherer 2022-1-26
回答： Stephen23 2022-8-22
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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采纳的回答

Stephen23
Stephen23 2022-8-22
Ran in:
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"

更多回答（1 个）

Voss
Voss 2022-1-26
Ran in:
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'}

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