How to save struct array into H5

2022 4 8
1 个回答
更新时间：2023 11 16
14 次查看（30 天）

0 个投票

Hi guys
I have this simple struct array wdata, has 4 fileds and saved as struct array
FieldA =int32([1153 ; 1184 ; 1027;11 ]);
FieldB ={'Exterior (static)', 'Intake',...
'Intake manifold','test'};
FieldArray = [randn(1,ADIM0);randn(1,ADIM0);randn(1,ADIM0);randn(1,ADIM0)];
FieldC =int32([11 ; 12 ; 13; 14]);
for i = 1:DIM0
wdata(i).FieldA =FieldA(i);
wdata(i).FieldB =FieldB(i);
wdata(i).FieldArray = FieldArray(i);
wdata(i).FieldC = FieldC;
end
I want to save wdata into h5 as compound, but I got stuck with memory assigning
can anyone help?
thansk

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Kat Lee
Kat Lee 2022-4-8
编辑：Kat Lee 2022-4-8
Tried this, but failed
dim = 4;
file = H5F.create (fileName, 'H5F_ACC_TRUNC',...
'H5P_DEFAULT', 'H5P_DEFAULT');
intType =H5T.copy('H5T_NATIVE_INT');
sz(1) = H5T.get_size(intType);
strType = H5T.copy ('H5T_C_S1');
H5T.set_size (strType, 'H5T_VARIABLE');
sz(2) =H5T.get_size(strType);
% array size
base_type_id = H5T.copy('H5T_NATIVE_DOUBLE');
arrayType = H5T.array_create(base_type_id, 1, ADIM0);
type_id = H5T.copy(arrayType);
H5T.set_size(type_id, 8);
sz(3) = H5T.get_size(arrayType);
intType =H5T.copy('H5T_NATIVE_INT');
sz(4) = H5T.get_size(intType);
offset(1)=0;
offset(2:4)=cumsum(sz(1:3));
memtype = H5T.create ('H5T_COMPOUND', sum(sz));
H5T.insert (memtype,...
'FieldA',offset(1),intType);
H5T.insert (memtype,...
'FieldB',offset(2), strType);
H5T.insert (memtype,...
'FieldArray',offset(3), arrayType);
H5T.insert (memtype,...
'FieldC',offset(4), intType);
filetype = H5T.create ('H5T_COMPOUND', sum(sz));
H5T.insert (filetype, 'FieldA', offset(1),intType);
H5T.insert (filetype, 'FieldB', offset(2), strType);
H5T.insert (filetype, 'FieldArray',offset(3), arrayType);
H5T.insert (filetype, 'FieldC',offset(4), intType);
space = H5S.create_simple (1,fliplr(dims), []);
dset = H5D.create (file, DATASET, filetype, space, 'H5P_DEFAULT');
H5D.write (dset, memtype, 'H5S_ALL', 'H5S_ALL', 'H5P_DEFAULT', flip(wdata));

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回答（1 个）

Shivam Lahoti
Shivam Lahoti 2023-11-16

0 个投票

Hi Kat Lee,
I can understand that you want to save the ‘wdata’ struct array into an HDF5 file as a compound datatype. However, you mentioned that you encountered issues with memory assignment.
You shall use the functions ‘h5create’ to create the HDF5 file and define the compound datatype and ‘h5write’ to write each struct element to the HDF5 file.
Execute this command into your MATLAB window to understand the implementation of both functions with the help of an example.
openExample('matlab/WriteToEntireDataSetExample')
Refer to the documentation below for more clarity.
https://www.mathworks.com/help/matlab/ref/h5write.html
https://www.mathworks.com/help/matlab/ref/h5create.html
I hope this was helpful.
Regards,
Shivam Lahoti.

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