using accumarray to combine text

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Pete sherer
Pete sherer on 26 Jan 2022
Answered: _ on 26 Jan 2022
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.

Accepted Answer

_
_ on 26 Jan 2022
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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