Remove the Last Entry of Many Fields of a Structure

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Allen Hammack
Allen Hammack 2021-11-8
评论： Allen Hammack 2021-11-8
I have a multiple structures with many fields, and each field has thousands of entries (rows). I need the each field in a particular structure to have the same number of entries (rows). For instance, here is a sample of my situation:
data.test1=1:10;
data.test2=3:12;
data.test3=2:11;
data.test4=1:10;
data.test5=2:10;
data.test6=4:12;
data.test7=5:13;
data = structfun(@transpose,data,'UniformOutput',false);
How can I trim the last entry (row) from data.test1, data.test2, data.test3, and data.test4 programmatically? (In my real structures, I have many more fields, so I would prefer to not trim each field one at a time. I would greatly prefer to trim all the necessary fields in one command.) Will someone please help?

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采纳的回答

Adam Danz
Adam Danz 2021-11-8
dataTrimmed = structfun(@(s)s(1:end-1),data,'UniformOutput',false);
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Adam Danz
Adam Danz 2021-11-8
Ran in:
Sorry, I misunderstood. Here's how to do that,
data.test1=1:10;
data.test2=3:12;
data.test3=2:11;
data.test4=1:10;
data.test5=2:10;
data.test6=4:12;
data.test7=5:13;
data = structfun(@transpose,data,'UniformOutput',false)
data = struct with fields:
test1: [10×1 double] test2: [10×1 double] test3: [10×1 double] test4: [10×1 double] test5: [9×1 double] test6: [9×1 double] test7: [9×1 double]
% Get min count
minCount = min(structfun(@numel, data))
minCount = 9
% trim to min count
dataTrimmed = structfun(@(s)s(1:minCount),data,'UniformOutput',false)
dataTrimmed = struct with fields:
test1: [9×1 double] test2: [9×1 double] test3: [9×1 double] test4: [9×1 double] test5: [9×1 double] test6: [9×1 double] test7: [9×1 double]

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更多回答（1 个）

Sean de Wolski
Sean de Wolski 2021-11-8
Ran in:
data.test1=1:10;
data.test2=3:12;
data.test3=2:11;
data.test4=1:10;
data.test5=2:10;
data.test6=4:12;
data.test7=5:13;
n = structfun(@numel,data);
toremove = n-min(n);
fn = fieldnames(data);
for ii = 1:numel(fn)
data.(fn{ii}) = data.(fn{ii})(1:(numel(data.(fn{ii}))-toremove(ii)));
end
struct2table(data)
ans = 1×7 table
test1 test2 test3 test4 test5 test6 test7 __________ __________ __________ __________ __________ __________ __________ 1×9 double 1×9 double 1×9 double 1×9 double 1×9 double 1×9 double 1×9 double
The interior of that loop could obviously be made clearer but I'll leave that as an exercise.

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