Stacking 2D matrix to 3D using time as a third variable

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Ashal
Ashal 2022-12-9
评论： Peter Perkins 2022-12-12
Hi I am a beginner in matlab and I am trying to stack 2D matrix into 3D matrix. I have variable sst as 1440*720 and time variable as 1*366. These are all daily data. How do I stack time to sst so that I have 366*1440*720 matrix. I have tried using cat and meshgrid but nothing seems to work. Thank you.
data.time = cat(3,data.time,data.sst)
or
[data.sst1]=meshgrid(data.sst,data.time); (this multiplies 1440*720 and gives me 366*1036800 matrix)
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Ashal
Ashal 2022-12-9
编辑：Ashal 2022-12-9
Thank you. I do have individual 366 1440*720 and I am using the following code to read data. So basically I have 366 different files that has sst(1440*720) and time values Here ii =366. I wish I could add data here but it is a huge folder.
gunzip("2020.zip.gz")
!ls 2020/oisst-*.nc>data.ptr
x = importdata('data.ptr'); %here x is cell array
for ii = 1:length(x);
data.time(ii) = ncread(x{ii},'time');
%ncdisp("2020/oisst-avhrr-v02r01.20200101.nc"); %ncdisp look inside nc file
data.sst = ncread(x{ii}, 'sst');
end
Peter Perkins
Peter Perkins 2022-12-12
Just out of curiousity ...
366, OK, days in 2020 (although you may have a bug when you work on a non-leap year)
1440, OK, so maybe 24*60 minutes in a day?
What does 720 represent?
Or is 1440x720 a spatial lat/lon grid?

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Voss
Voss 2022-12-9
编辑：Voss 2022-12-9
nx = numel(x);
data = struct( ...
'time',zeros(1,nx), ...
'sst',zeros(nx,1440,720);
for ii = 1:nx
data.time(ii) = ncread(x{ii},'time');
%ncdisp("2020/oisst-avhrr-v02r01.20200101.nc"); %ncdisp look inside nc file
data.sst(ii,:,:) = ncread(x{ii}, 'sst');
end
That makes data.sst a 366*1440*720 array, as requested.

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