Documentation of subset

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Function Synopsis

x = subset2(y, nya, nxa, lims);

Help text

   x = subset2(y, lat, lon, lims);

   This returns a matrix x(nlat, nlon) that is
   a region in y defined by frame

   lims = [w e s n] limits

Cross-Reference Information

Listing of function subset

function x = subset2(y, nya, nxa, lims);
ndims = sum(size(size(y)))-1;

nxak = find(nxa >= lims(1) & nxa <= lims(2));
nyak = find(nya >= lims(3) & nya <= lims(4));

if (ndims == 2);
     [nlat, nlon] = size(y);
     if ((length(nya) ~= nlat) | (length(nxa) ~= nlon));
          error('Input Y has different dimensions than Inputs lat or lon')
     end
     x = y(nyak, nxak);
elseif (ndims == 3);
     [ntim, nlat, nlon] = size(y);
     if ((length(nya) ~= nlat) | (length(nxa) ~= nlon));
          error('Input Y has different dimensions than Inputs lat or lon')
     end
     x = y(:,nyak, nxak);
elseif (ndims == 4);
     [ntim, nlev, nlat, nlon] = size(y);
     if ((length(nya) ~= nlat) | (length(nxa) ~= nlon));
          error('Input Y has different dimensions than Inputs lat or lon')
     end
     x = y(:,:,nyak, nxak);
end