matlab-grid-generator/bin/wrslice.m

% wrslice(filename,arr,n,k) writes an array of shape [nx,ny,...]
% to a direct access binary file (float or double precisision) named
% by the string 'filename'. The file may contain multi-dimensional
% data. 'n' is the record number to be written where the record length
% is the size of the array 'arr'.
%
% eg.   wrslice('t.xyt',T,4);
%
% rdsclice(filename,A,k,type) writes an array of type 'type'.
% where type can be one of 'real*4' or 'real*8'. The default is 'real*8'.
function [] = wrslice(file,arr,k,varargin)

% Default word-length
WORDLENGTH=8;
rtype='real*8';
ieee='b';

% Check optional arguments
args=char(varargin);
while (size(args,1) > 0)
 if deblank(args(1,:)) == 'real*4'
  WORDLENGTH=4;
  rtype='real*4';
 elseif deblank(args(1,:)) == 'real*8'
  WORDLENGTH=8;
  rtype='real*8';
 elseif deblank(args(1,:)) == 'n' | deblank(args(1,:)) == 'native'
  ieee='n';
 elseif deblank(args(1,:)) == 'l' | deblank(args(1,:)) == 'ieee-le'
  ieee='l';
 elseif deblank(args(1,:)) == 'b' | deblank(args(1,:)) == 'ieee-be'
  ieee='b';
 elseif deblank(args(1,:)) == 'c' | deblank(args(1,:)) == 'cray'
  ieee='c';
 elseif deblank(args(1,:)) == 'a' | deblank(args(1,:)) == 'ieee-le.l64'
  ieee='a';
 elseif deblank(args(1,:)) == 's' | deblank(args(1,:)) == 'ieee-be.l64'
  ieee='s';
 else
  sprintf(['Optional argument ' args(1,:) ' is unknown'])
  return
 end
 args=args(2:end,:);
end


N=size(arr);
nnn=prod(N);

[fid mess]=fopen(file,'r+',ieee);
if fid == -1
 [fid mess]=fopen(file,'w',ieee);
 if fid == -1
  sprintf('Error while opening file:\n%s',mess)
  return
 end
end
st=fseek(fid,nnn*(k-1)*WORDLENGTH,'bof');
if st ~= 0
 mess=ferror(fid);
 sprintf('There was an error while positioning the file pointer:\n%s',mess)
 return
end
count=fwrite(fid,arr,rtype);
if count ~= nnn
 sprintf('Not enough data was available to be read: off EOF?')
 return
end
st=fclose(fid);
1	% wrslice(filename,arr,n,k) writes an array of shape [nx,ny,...]
2	% to a direct access binary file (float or double precisision) named
3	% by the string 'filename'. The file may contain multi-dimensional
4	% data. 'n' is the record number to be written where the record length
5	% is the size of the array 'arr'.
6	%
7	% eg. wrslice('t.xyt',T,4);
8	%
9	% rdsclice(filename,A,k,type) writes an array of type 'type'.
10	% where type can be one of 'real4' or 'real8'. The default is 'real*8'.
11	function [] = wrslice(file,arr,k,varargin)
12
13	% Default word-length
14	WORDLENGTH=8;
15	rtype='real*8';
16	ieee='b';
17
18	% Check optional arguments
19	args=char(varargin);
20	while (size(args,1) > 0)
21	if deblank(args(1,:)) == 'real*4'
22	WORDLENGTH=4;
23	rtype='real*4';
24	elseif deblank(args(1,:)) == 'real*8'
25	WORDLENGTH=8;
26	rtype='real*8';
27	elseif deblank(args(1,:)) == 'n' \| deblank(args(1,:)) == 'native'
28	ieee='n';
29	elseif deblank(args(1,:)) == 'l' \| deblank(args(1,:)) == 'ieee-le'
30	ieee='l';
31	elseif deblank(args(1,:)) == 'b' \| deblank(args(1,:)) == 'ieee-be'
32	ieee='b';
33	elseif deblank(args(1,:)) == 'c' \| deblank(args(1,:)) == 'cray'
34	ieee='c';
35	elseif deblank(args(1,:)) == 'a' \| deblank(args(1,:)) == 'ieee-le.l64'
36	ieee='a';
37	elseif deblank(args(1,:)) == 's' \| deblank(args(1,:)) == 'ieee-be.l64'
38	ieee='s';
39	else
40	sprintf(['Optional argument ' args(1,:) ' is unknown'])
41	return
42	end
43	args=args(2:end,:);
44	end
45
46
47	N=size(arr);
48	nnn=prod(N);
49
50	[fid mess]=fopen(file,'r+',ieee);
51	if fid == -1
52	[fid mess]=fopen(file,'w',ieee);
53	if fid == -1
54	sprintf('Error while opening file:\n%s',mess)
55	return
56	end
57	end
58	st=fseek(fid,nnn(k-1)WORDLENGTH,'bof');
59	if st ~= 0
60	mess=ferror(fid);
61	sprintf('There was an error while positioning the file pointer:\n%s',mess)
62	return
63	end
64	count=fwrite(fid,arr,rtype);
65	if count ~= nnn
66	sprintf('Not enough data was available to be read: off EOF?')
67	return
68	end
69	st=fclose(fid);