How to convert a nifti file to a .dat file?

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Hi,
I have a 4D nifti file with dimensions [256, 256, 36, 99]. I want to convert this nifti file to a .dat file.
I did the following but seems that the dimensions are not the same.
%load nifti data
nifti_data = load_untouch_nii('/Users/data.nii');
%convert data to doubles
data=double(nifti_data.img);
%write data to .dat file
dlmwrite('data.dat', '')
Does anybody know how to write a nifti file to a .dat file but keep the dimensions the same?

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