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save7.m
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save7.m
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function save7( fn, varargin )
% always save mat in version7 format.
% for large variables, automatically do slicing
% save7( fn )
% save7( fn, varname1, varname2 )
% save7( fn, var_struct )
% get data to save
vl = {}; S = [];
if isempty(varargin)
vl = evalin('caller','who');
elseif isscalar(varargin) && isstruct( varargin{1} )
S = varargin{1};
else
vl = varargin;
assert( all(cellfun( @ischar, vl )), ...
'all arguments should be char' );
end
is_struct_input = 0;
vli = vl;
if isempty(vl)
is_struct_input = 1;
if isempty(S)
S = struct();
end
else
cm = cell( 1, numel(vl) );
for k = 1:numel(vl)
cm{k} = sprintf( '''%s'', {%s}, ', vl{k}, vl{k} );
end
cm = cat(2, cm{:} );
cm = cm(1:(end-2));
cm = sprintf( 'struct( %s )', cm );
S = evalin( 'caller', cm );
end
% reserve a control variable
sv = struct( 'name', {}, 'size', {}, 'var', {} );
subsv = substruct('.','sv_');
vl = fieldnames( S );
if ismember('sv_',vl)
sv(end+1).name = 'sv_';
sv(end).size = size(S.sv_);
sv_nn = get_unconflicted_name('sv_',vl);
S = subsasgn( S, subsref( S, substruct('.',sv_nn) ), ...
subsref( S, subsv ) );
sv(end).var = {sv_nn};
[~,sv_loc] = ismember( 'sv_', vl );
vl{sv_loc} = sv_nn;
end
S.sv_ = [];
% split data if necessary
vlc = fieldnames(S);
sl = 2^31;
for k = 1:numel(vl)
V = [];
if is_struct_input
vname = vl{k};
V = subsref( S, substruct('.',vname) );
vinfo = whos('V');
vinfo.name = vname;
else
vname = vli{k};
vinfo = evalin('caller', sprintf('whos(''%s'')', vname) );
end
if vinfo.bytes > sl
if isempty(V)
V = subsref( S, substruct('.',vname) );
end
S = rmfield( S, vname );
% vlc = setdiff(vlc,vname);
vsp = slicing_var( V, sl, vname );
sv(end+1).name = vname;
sv(end).size = vinfo.size;
sv(end).var = {};
n = numel(vsp);
r = 1; vsp = [0;vsp];
for i = 1:n
[subvname, r] = get_unconflicted_name( vname, vlc, r );
vlc = [vlc;{subvname}];
sv(end).var = [sv(end).var; subvname];
v_i = vec(V((vsp(i)+1):vsp(i+1)));
S = subsasgn( S, substruct( '.', subvname ), v_i );
r = r+1;
end
end
end
% save data to file
S.sv_ = sv;
save_from_struct(fn,S,'-v7');
function sp = slicing_var( V, sl, vname )
sp = slicing_var_v2( V, sl, vname );
function sp = slicing_var_v2( V, sl, vname )
sp = [];
q = 0;
while ~isempty(V)
vinfo = whos('V');
vb = vinfo.bytes;
sf = ceil(vb/sl);
n = numel(V);
p = max(1,floor(n/sf));
if p == n,
ab = vb;
else
A = V(1:p);
ainfo = whos('A');
clear A
ab = ainfo.bytes;
end
% exponential search
while ab>sl
assert( p>=1, 'Cannot find a small enough slice for "%s"', vname );
p = max(1,floor(p*0.75));
A = V(1:p);
ainfo = whos('A');
clear A
ab = ainfo.bytes;
end
q = q+p;
sp = [sp;q];
V = V(p+1:end);
end
function sp = slicing_var_v1( V, sl, vname )
n = numel(V);
es = zeros(n,1);
for j = 1:n
v_j = V(j);
einfo = whos('v_j');
es(j) = einfo.bytes;
assert( es(j)<=sl, 'Cannot find small enough slice for "%s"', vname );
end
clear v_j
cs = cumsum(es);
sp = [];
j = 1;
while j<=n
j1 = find(cs<=sl,1,'last');
sp = [sp;j1];
cs = cs - cs(j1);
j = j1+1;
end
function [final_name, final_id] = get_unconflicted_name( ...
name_prefix, existing_names, base_id )
if nargin<3
base_id = 0;
end
if base_id>0 || ismember(name_prefix,existing_names)
k = max(1,base_id);
final_name = [ name_prefix '__' int2str(k) ];
while ismember( final_name, existing_names )
k = k + 1;
final_name = [ name_prefix '__' int2str(k) ];
end
else
k = base_id;
final_name = name_prefix;
end
final_id = k;
function a = vec(a)
a = reshape(a,numel(a),1);