failure Reading Variables from multiple Netcdf files

2022 7 11
1 个回答
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更新时间：2022 8 2
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0 个投票

I am trying to read multiple different variables that is within a netcdf file, and almost extract the number that is associated with the variable that is listed. so what i have done is for it to loop for each variable, but i get an error displaying that one of the variable is not found even though it is on the nc file if i do ncdisp. could anyone help or optimise the code a little?
many thanks
ncvars={'duration','tecmin','tecmax','elevmin','elevmax','elev_tecmax','alt_elevmax','lat_elevmax','lon_elevmax','alt_tecmax','lat_tecmax','lon_tecmax','alt_start','lat_start','lon_start','alt_stop','lat_stop','lon_stop'};
projectdir= 'F:\cosmic_2_data_file';
dinfo=dir(fullfile(projectdir,'*.0001_nc'));
num_files=length(dinfo);
filenames=fullfile(projectdir,{dinfo.name});
durations=cell(num_files,1);
tecmins=cell(num_files,1);
tecmaxs=cell(num_files,1);
elevmins=cell(num_files,1);
elevmaxs=cell(num_files,1);
elevtecmaxs=cell(num_files,1);
altelevmaxs=cell(num_files,1);
latelevmaxs=cell(num_files,1);
lonelevmaxs=cell(num_files,1);
alttecmaxs=cell(num_files,1);
lattecmaxs=cell(num_files,1);
lontecmaxs=cell(num_files,1);
altstarts=cell(num_files,1);
latstarts=cell(num_files,1);
lonstarts=cell(num_files,1);
altstops=cell(num_files,1);
latstops=cell(num_files,1);
lonstops=cell(num_files,1);
for i=1 : num_files
this_file=filenames{i};
durations{i}=ncread(this_file,ncvars{1});
tecmins{i}=ncread(this_file,ncvars{2});
tecmaxs{i}=ncread(this_file,ncvars{3});
elevmins{i}=ncread(this_file,ncvars{4});
elevmaxs{i}=ncread(this_file,ncvars{5});
elevtecmaxs{i}=ncread(this_file,ncvars{6});
altelevmaxs{i}=ncread(this_file,ncvars{7});
latelevmaxs{i}=ncread(this_file,ncvars{8});
lonelevmaxs{i}=ncread(this_file,ncvars{9});
alttecmaxs{i}=ncread(this_file,ncvars{10});
lattecmaxs{i}=ncread(this_file,ncvars{11});
lontecmaxs{i}=ncread(this_file,ncvars{12});
altstarts{i}=ncread(this_file,ncvars{13});
latstarts{i}=ncread(this_file,ncvars{14});
lonstarts{i}=ncread(this_file,ncvars{15});
altstops{i}=ncread(this_file,ncvars{16});
latstops{i}=ncread(this_file,ncvars{17});
lonstop{i}=ncread(this_file,ncvars{18});
end
there are about 9400 .0001_nc files so i am hoping it can loop through and read the variables that i want and almost record that number and save it as a new cell.

4 个评论
显示 2更早的评论 隐藏 2更早的评论

MJFcoNaN
MJFcoNaN 2022-7-13
Hello,
Please post full error messages and the relevant result of ncdisp
Walter Roberson
Walter Roberson 2022-7-25
Please show the output of
ncinfo(this_file)
for the first file.
Tianchu Lu
Tianchu Lu 2022-8-2
ncvars={'TEC','elevation','time','x_LEO','y_LEO','z_LEO','x_GPS','y_GPS','z_GPS'};
projectdir= "F:\podtc2_data\podTc2_nrt_2022_004";
dinfo=dir(fullfile(projectdir,'*.0001_nc'));
num_files=length(dinfo);
filenames=fullfile(projectdir,{dinfo.name});
TEC_podtc2s=cell(num_files,1);
Elevation_podtc2s=cell(num_files,1);
times=cell(num_files,1);
x_LEOs=cell(num_files,1);
y_LEOs=cell(num_files,1);
z_LEOs=cell(num_files,1);
x_GPSs=cell(num_files,1);
y_GPSs=cell(num_files,1);
z_GPSs=cell(num_files,1);
for i=1 : num_files
this_file=filenames{i};
TEC_podtc2s{i}=ncread(this_file,ncvars{1});
Elevation_podtc2s{i}=ncread(this_file,ncvars{2});
times{i}=ncread(this_file,ncvars{3});
x_LEOs{i}=ncread(this_file,ncvars{4});
y_LEOs{i}=ncread(this_file,ncvars{5});
z_LEOs{i}=ncread(this_file,ncvars{6});
x_GPSs{i}=ncread(this_file,ncvars{7});
y_GPSs{i}=ncread(this_file,ncvars{8});
z_GPSs{i}=ncread(this_file,ncvars{9});
end

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 采纳的回答

Tianchu Lu
Tianchu Lu 2022-8-2

0 个投票

ncvars={'TEC','elevation','time','x_LEO','y_LEO','z_LEO','x_GPS','y_GPS','z_GPS'};
projectdir= "F:\podtc2_data\podTc2_nrt_2022_004";
dinfo=dir(fullfile(projectdir,'*.0001_nc'));
num_files=length(dinfo);
filenames=fullfile(projectdir,{dinfo.name});
TEC_podtc2s=cell(num_files,1);
Elevation_podtc2s=cell(num_files,1);
times=cell(num_files,1);
x_LEOs=cell(num_files,1);
y_LEOs=cell(num_files,1);
z_LEOs=cell(num_files,1);
x_GPSs=cell(num_files,1);
y_GPSs=cell(num_files,1);
z_GPSs=cell(num_files,1);
for i=1 : num_files
this_file=filenames{i};
TEC_podtc2s{i}=ncread(this_file,ncvars{1});
Elevation_podtc2s{i}=ncread(this_file,ncvars{2});
times{i}=ncread(this_file,ncvars{3});
x_LEOs{i}=ncread(this_file,ncvars{4});
y_LEOs{i}=ncread(this_file,ncvars{5});
z_LEOs{i}=ncread(this_file,ncvars{6});
x_GPSs{i}=ncread(this_file,ncvars{7});
y_GPSs{i}=ncread(this_file,ncvars{8});
z_GPSs{i}=ncread(this_file,ncvars{9});
end

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