Remove the Last Entry of Many Fields of a Structure

Question

Allen Hammack 2021-11-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1581604-remove-the-last-entry-of-many-fields-of-a-structure

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?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Adam Danz 2021-11-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1581604-remove-the-last-entry-of-many-fields-of-a-structure#answer_826664

在 MATLAB Online 中打开

dataTrimmed = structfun(@(s)s(1:end-1),data,'UniformOutput',false);

3 个评论
显示 1更早的评论隐藏 1更早的评论

Adam Danz 2021-11-8

在 MATLAB Online 中打开

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]
 

Allen Hammack 2021-11-8

That's perfect! thank you so much!

请先登录，再进行评论。

Answer 2

Sean de Wolski 2021-11-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1581604-remove-the-last-entry-of-many-fields-of-a-structure#answer_826714

在 MATLAB Online 中打开

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