anonymous function w/ accumarray
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Pete sherer
le 1 Juil 2021
Commenté : Star Strider
le 22 Août 2022
tdata = table([ 1 1 1 2 2]', [1 5 9 10 1]', 'VariableNames',{'year','id'})
Hi
I got error message below. Could you help shed light why I can't use accumarray with concatinating text output?
year id
____ __
1 1
1 5
1 9
2 10
2 1
cat = @(x) {sprintf([repmat('%s,',1,length(x)-1) '%s'], string(x))};
However got error below when trying to call
[ uniqYr,~,JGrp] = unique( tdata(:,'year'));
tt= accumarray( JGrp, tdata.id, [], @cat);
Error using cat
Dimension argument must be a real, positive, integer scalar.
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Star Strider
le 1 Juil 2021
Naming your function ‘cat’ overshadows the existing MATLAB function by that name, that you inadvertently called when you used the ‘@’ operator in the accumarray call. First, rename the anonymous function, and do not use the ‘@’ in the accumarray call when calling it, since it is already a function handle.
This slight variation on the original code works:
tdata = table([ 1 1 1 2 2]', [1 5 9 10 1]', 'VariableNames',{'year','id'})
catfcn = @(x) {sprintf([repmat('%s,',1,length(x)-1) '%s'], string(x))};
[ uniqYr,~,JGrp] = unique( tdata(:,'year'));
tt= accumarray( JGrp, tdata.id, [], catfcn)
.
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Star Strider
le 22 Août 2022
tdata = table([ 1 1 1 2 2]', [1 5 9 10 1]',["a" "b" "c" "d" "e"]', 'VariableNames',{'year','id','name'});
% tdata.name= cellstr( tdata.name)
tdata.name = char(tdata.name)
catfcn = @(x) {sprintf([repmat('%s,',1,length(x)-1) '%s'], string(x))};
[ uniqYr,~,JGrp] = unique( tdata(:,'year'));
tt = accumarray( JGrp, tdata.name, [], catfcn)
.
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