GEO lat and GSE xyz conversion

irfu-matlab: coordinate transformation

% generate random time series 
t=irf_time(now,'datenum2epoch')+[1:10]; t=t(:);
frGSE = [t rand(numel(t),1)-0.5 rand(numel(t),1)-0.5 rand(numel(t),1)-0.5];

% example of conversion to GSM
frGSM = irf_gse2gsm(frGSE);

% example of conversion to GEO using irf routine
frGEO = irf.geocentric_coordinate_transformation(frGSE,'GSE>GEO');

% example of conversion to GEO using onera routine
timeDatenum=irf_time(frGSE(:,1),'epoch2datenum');
frGEO = onera_desp_lib_coord_trans(frGSE(:,2:4),'gse2geo',timeDatenum);
frGEO = [frGSE(:,1) frGEO];

% conversion xyz to r/lat/long
frGEOsph = [frGSE(:,1) onera_desp_lib_coord_trans(frGSE(:,2:4),'car2sph')];