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cnh |
1.1 |
% WRDA( file, arr, irec [options] ) |
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% |
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% This routine writes the array 'arr' as a record in a direct-access |
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% binary file (float or double precision) with filename 'file'. |
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% The data will be written as the irec'th record. The file is created |
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% if it does not exists. |
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% |
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% Required arguments: |
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% |
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% file - string - name of file to create/append |
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% arr - array - matlab matrix or multi-dimensional array |
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% irec - integer - record number in file in which to write data |
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% |
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% Optional arguments (must appear after the required arguments): |
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% prec - string - precision of storage in file. Default = 'real*8'. |
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% ieee - string - IEEE bit-wise representation in file. Default = 'b'. |
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% |
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% 'prec' may take the values: |
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% 'real*4' - floating point, 32 bits. |
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% 'real*8' - floating point, 64 bits - the default. |
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% |
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% 'ieee' may take values: |
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% 'ieee-be' or 'b' - IEEE floating point with big-endian |
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% byte ordering - the default |
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% 'ieee-le' or 'l' - IEEE floating point with little-endian |
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% byte ordering |
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% 'native' or 'n' - local machine format |
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% 'cray' or 'c' - Cray floating point with big-endian |
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% byte ordering |
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% 'ieee-le.l64' or 'a' - IEEE floating point with little-endian |
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% byte ordering and 64 bit long data type |
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% 'ieee-be.l64' or 's' - IEEE floating point with big-endian byte |
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% ordering and 64 bit long data type. |
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% |
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% eg. wrda('t.data',T,4); |
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% wrda('t.data',T,4,'real*4'); |
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% wrda('t.data',T,4,'real*4','b'); |
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function [] = wrda(file,arr,k,varargin) |
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% Defaults |
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WORDLENGTH=8; |
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rtype='real*8'; |
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ieee='b'; |
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% Check optional arguments |
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args=char(varargin); |
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while (size(args,1) > 0) |
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if deblank(args(1,:)) == 'real*4' |
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WORDLENGTH=4; |
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rtype='real*4'; |
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elseif deblank(args(1,:)) == 'real*8' |
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WORDLENGTH=8; |
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rtype='real*8'; |
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elseif deblank(args(1,:)) == 'n' | deblank(args(1,:)) == 'native' |
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ieee='n'; |
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elseif deblank(args(1,:)) == 'l' | deblank(args(1,:)) == 'ieee-le' |
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ieee='l'; |
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elseif deblank(args(1,:)) == 'b' | deblank(args(1,:)) == 'ieee-be' |
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ieee='b'; |
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elseif deblank(args(1,:)) == 'c' | deblank(args(1,:)) == 'cray' |
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ieee='c'; |
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elseif deblank(args(1,:)) == 'a' | deblank(args(1,:)) == 'ieee-le.l64' |
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ieee='a'; |
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elseif deblank(args(1,:)) == 's' | deblank(args(1,:)) == 'ieee-be.l64' |
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ieee='s'; |
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else |
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sprintf(['Optional argument ' args(1,:) ' is unknown']) |
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return |
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end |
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args=args(2:end,:); |
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end |
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N=size(arr); |
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nnn=prod(N); |
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[fid mess]=fopen(file,'r+',ieee); |
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if fid == -1 |
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[fid mess]=fopen(file,'w',ieee); |
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if fid == -1 |
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sprintf('Error while opening file:\n%s',mess) |
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return |
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end |
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end |
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st=fseek(fid,nnn*(k-1)*WORDLENGTH,'bof'); |
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if st ~= 0 |
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mess=ferror(fid); |
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sprintf('There was an error while positioning the file pointer:\n%s',mess) |
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return |
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end |
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count=fwrite(fid,arr,rtype); |
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if count ~= nnn |
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sprintf('Not enough data was available to be read: off EOF?') |
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return |
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end |
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st=fclose(fid); |
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