savemagtoh5.m
2e0aa43721aa3Dmpimode

savemagtoh5.m
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			function savemagtoh5(filename,r,z,Athet,Br,Bz,overwrite)
			% saves a magnetic field to be used with Fennecs
			% if Br or Bz is not set it is calulated from the magnetic vector potential
			% Overwrite defines if the .h5 file must be overwritten
			if nargin<6
			[Bz,~]=-gradient(Athet,mean(diff(z)));
			end
			if nargin<5
			[~, Br]=gradient(r.*Athet,1,mean(diff(r)));
			Br=Br./r;
			end
			if nargin<7
			overwrite=false;
			end

			if overwrite && exist(filename,'file')==2
			delete(filename);
			end

			h5create(filename,'/mag/r',length(r));
			h5create(filename,'/mag/z',length(z));
			h5create(filename,'/mag/Athet',size(Athet'));
			h5create(filename,'/mag/Br',size(Br'));
			h5create(filename,'/mag/Bz',size(Bz'));
			h5write(filename,'/mag/r',r) % stores the radial grid position
			h5write(filename,'/mag/z',z) % stores the axial grid position
			h5write(filename,'/mag/Athet',Athet')
			h5write(filename,'/mag/Br',Br')
			h5write(filename,'/mag/Bz',Bz')

			end