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function writegcm(fnam,fld,tme,nPx,nPy,prec,oflag) |
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% Function writegcm(fnam,fld,tme,nPx,nPy,prec,oflag) |
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% write array fld in MIT GCM UV format |
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% |
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% INPUTS |
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% fnam output file name |
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% fld Nx*Ny*Nz*Nt input array |
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% tme model integration times in days has dimension Nt |
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% nPx, nPy number of processes in x and y direction (default 1,1) |
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% prec numeric precision (default 'real*4') |
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% oflag overwrite flag specifies field to be overwritten |
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% oflag=0 means create new file (the default) |
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% oflag>0 must have dimension Nt |
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% |
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% SEE ALSO |
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% readgcm |
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if nargin < 2, error('please specify array and output file name'); end |
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[Nx Ny Nz Nt]=size(fld); |
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if nargin < 7, oflag=0; end |
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if oflag > 0 |
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if length(oflag) ~= Nt, error('length(oflag) must equal Nt'); end |
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end |
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if nargin < 6, prec='real*4'; end |
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if nargin < 5, nPy=1; end |
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if nargin < 4, nPx=1; end |
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if nargin < 3, tme=1:Nt; end |
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if length(tme) ~= Nt, error('length(tme) must equal Nt'); end |
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sNx=Nx/nPx; % number of X points in sub-grid |
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sNy=Ny/nPy; % number of Y points in sub-grid |
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if (sNx-floor(sNx))~=0 | (sNy-floor(sNy))~=0 |
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error('Nx/nPx and Ny/nPy must be integer') |
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end |
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switch prec |
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case {'float32', 'real*4'} |
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rlength=(sNx*sNy*Nz+1)*4; |
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case {'float64', 'real*8'} |
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rlength=(sNx*sNy*Nz+1)*8; |
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end |
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if oflag == 0 |
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fid=fopen(fnam,'w','ieee-be'); |
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for t=1:Nt |
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for j=1:nPy |
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jx=((j-1)*sNy+1):(j*sNy); |
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for i=1:nPx |
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ix=((i-1)*sNx+1):(i*sNx); |
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fwrite(fid,tme(t),prec); |
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fwrite(fid,fld(ix,jx,:,t),prec); |
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end |
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end |
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end |
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else |
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fid=fopen(fnam,'r+','ieee-be'); |
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for t=1:Nt |
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if fseek(fid,nPx*nPy*(oflag(t)-1)*rlength,'bof') |
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error('unexpected end of file reached') |
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end |
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for j=1:nPy |
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jx=((j-1)*sNy+1):(j*sNy); |
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for i=1:nPx |
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ix=((i-1)*sNx+1):(i*sNx); |
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fwrite(fid,tme(t),prec); |
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fwrite(fid,fld(ix,jx,:,t),prec); |
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end |
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end |
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end |
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end |
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fid=fclose(fid); |
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