I am trying to save struct to file and load it but when I load it I can't get field names

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hadasa kaufman 2022-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/1762850-i-am-trying-to-save-struct-to-file-and-load-it-but-when-i-load-it-i-can-t-get-field-names

评论： hadasa kaufman 2022-7-18

hi,

I am saving structure arrays to file in one matlab script and I can find the mat file and to open it.

save('/sci/labs/mbreker/hadasak/icore-data/MAPS_seq/Data/example_July_2016/Analysis/subjects_queries.mat','subjects','queries');

I am open it in another matlab script

queries=load('/sci/labs/mbreker/hadasak/icore-data/MAPS_seq/Data/example_July_2016/Analysis/subjects_queries.mat','queries');

subjects=load('/sci/labs/mbreker/hadasak/icore-data/MAPS_seq/Data/example_July_2016/Analysis/subjects_queries.mat','subjects');

but then when I am trying to insert into the struct by fieldnames

outfilename=sprintf('%s/%s_Alt_analysis_%s',getfield(queries,{1},'directory'),proj_tag,datelabel);

or

outfilename=sprintf('%s/%s_Alt_analysis_%s',queries(1).directory,proj_tag,datelabel);

I get this error:

Unrecognized field name "directory".

Error in getfield (line 69)

f = f.(field);

another thing that I notic is that when I open the .mat file (not load it, just reviewe of the file in matlab), I can see the fields.

I will be happy to get help,

thanks!

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Jonas 2022-7-18

what is the output of fieldnames(queries)? could you also supply the mat file contianing the struct?

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Answer 1

Stephen23 2022-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/1762850-i-am-trying-to-save-struct-to-file-and-load-it-but-when-i-load-it-i-can-t-get-field-names#answer_1009990

编辑：Stephen23 2022-7-18

在 MATLAB Online 中打开

Load the data like this:

F = '/sci/labs/mbreker/hadasak/icore-data/MAPS_seq/Data/example_July_2016/Analysis/subjects_queries.mat';
S = load(F);
queries  = S.queries;
subjects = S.subjects;

and everything will work just as you want. Note that the output of LOAD() is not your data arrays, but is always a scalar structure that contains all of your data arrays. So you simply need to refer to its fields (which are your data arrays).