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function df = subsasgn(df, S, RHS)
%# function df = subsasgn(df, S, RHS)
%# This is the assignement operator for a dataframe object, taking
%# care of all the housekeeping of meta-info.
%% Copyright (C) 2009-2017 Pascal Dupuis <cdemills@gmail.com>
%%
%% This file is part of the dataframe package for Octave.
%%
%% This package is free software; you can redistribute it and/or
%% modify it under the terms of the GNU General Public
%% License as published by the Free Software Foundation;
%% either version 3, or (at your option) any later version.
%%
%% This package is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied
%% warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
%% PURPOSE. See the GNU General Public License for more
%% details.
%%
%% You should have received a copy of the GNU General Public
%% License along with this package; see the file COPYING. If not,
%% see <http://www.gnu.org/licenses/>.
if (isnull (df))
error ('dataframe subsasgn: first argument may not be empty');
end
switch (S(1).type)
case '{}'
error ('Invalid dataframe as cell assignement');
case '.'
%# translate the external to internal name
switch (S(1).subs)
case 'rownames'
if (~isnull (RHS) && isempty (df.x_name{1}))
df.x_name{1}(1:df.x_cnt(1), 1) = {''};
df.x_over{1}(1, 1:df.x_cnt(1)) = true;
end
[df.x_name{1}, df.x_over{1}] = df_strset ...
(df.x_name{1}, df.x_over{1}, S(2:end), RHS);
return
case 'rowidx'
if (1 == length (S))
df.x_ridx = RHS;
else
df.x_ridx = feval (@subsasgn, df.x_ridx, S(2:end), RHS);
end
return
case 'colnames'
if (isnull (RHS)) error ('Colnames can''t be nulled'); end
[df.x_name{2}, df.x_over{2}] = df_strset ...
(df.x_name{2}, df.x_over{2}, S(2:end), RHS, '_');
df.x_name{2} = genvarname (df.x_name{2});
return
case 'types'
if (isnull (RHS)) error ('Types can''t be nulled'); end
if (1 == length (S))
%# perform explicit cast on each column
switch (RHS)
case {'char'}
for indj = (1:df.x_cnt(2))
if (isnumeric (df.x_data{indj}) || islogical (df.x_data{indj}))
df.x_data(indj) = cellfun (@(x) cellstr (num2str(x, '%f')), ...
df.x_data(indj),
'UniformOutput', false);
end
end
otherwise
df.x_data = cellfun (@(x) cast (x, RHS), df.x_data,
'UniformOutput', false);
end
df.x_data = cellfun (@(x) cast (x, RHS), df.x_data,
'UniformOutput', false);
df.x_type(1:end) = RHS;
else
if (~strcmp (S(2).type, '()'))
error ('Invalid internal type sub-access, use () instead');
end
if (length (S) > 2 || length (S(2).subs) > 1)
error('Types can only be changed as a whole');
end
if (~isnumeric(S(2).subs{1}))
[indj, ncol, S(2).subs{1}] = df_name2idx ...
(df.x_name{2}, S(2).subs{1}, df.x_cnt(2), 'column');
else
indj = S(2).subs{1}; ncol = length (indj);
end
switch (RHS)
case {'char'}
if (isnumeric (df.x_data{indj}) || islogical (df.x_data{indj}))
df.x_data(indj) = cellfun (@(x) cellstr (num2str(x, '%f')), ...
df.x_data(indj),
'UniformOutput', false);
end
otherwise
df.x_data(indj) = cellfun (@(x) cast (x, RHS), df.x_data(indj),
'UniformOutput', false);
end
df.x_type(indj) = {RHS};
end
return
case 'source'
if (length (S) > 1)
df.x_src = feval (@subsasgn, df.x_src, S(2:end), RHS);
else
df.x_src = RHS;
end
return
case 'header'
if (length (S) > 1)
df.x_header = feval (@subsasgn, df.x_header, S(2:end), RHS);
else
df.x_header = RHS;
end
return
case 'comment'
if (length (S) > 1)
df.x_cmt = feval (@subsasgn, df.x_cmt, S(2:end), RHS);
else
df.x_cmt = RHS;
end
return
otherwise
if (~ischar (S(1).subs))
error ('Congratulations. I didn''t see how to produce this error');
end
%# translate the name to column
[indc, ncol] = df_name2idx (df.x_name{2}, S(1).subs, ...
df.x_cnt(2), 'column', true);
if (isempty (indc))
%# dynamic allocation
df = df_pad (df, 2, 1, class (RHS));
indc = df.x_cnt(2); ncol = 1;
df.x_name{2}(end) = S(1).subs;
df.x_name{2} = genvarname(df.x_name{2});
df.x_over{2}(end) = false;
end
if (length (S) > 1)
if (1 == length (S(2).subs)), %# add column reference
S(2).subs{2} = indc;
else
S(2).subs(2:3) = {indc, S(2).subs{2}};
end
else
%# full assignement
S(2).type = '()'; S(2).subs = { '', indc, ':' };
if (ndims (RHS) < 3)
if (isnull (RHS))
S(2).subs = {':', indc};
elseif (1 == size (RHS, 2))
S(2).subs = { '', indc };
elseif (1 == ncol && 1 == size (df.x_data{indc}, 2))
%# force the padding of the vector to a matrix
S(2).subs = {'', indc, [1:size(RHS, 2)]};
end
end
end
%# do we need to 'rotate' RHS ?
if (1 == ncol && ndims (RHS) < 3 ...
&& size (RHS, 2) > 1)
RHS = reshape (RHS, [size(RHS, 1), 1, size(RHS, 2)]);
end
df = df_matassign (df, S(2), indc, ncol, RHS);
end
case '()'
[indr, nrow, S(1).subs{1}] = df_name2idx (df.x_name{1}, S(1).subs{1}, ...
df.x_cnt(1), 'row');
if (isempty (indr) && df.x_cnt(1) > 0)
%# this is not an initial assignment
df = df; return;
end
if (any (indr < 1))
%# assigning line '0' -> this is a no-op
df = df; return;
end
if (length (S(1).subs) > 1)
if (~isempty (S(1).subs{2}))
[indc, ncol, S(1).subs{2}] = ...
df_name2idx (df.x_name{2}, S(1).subs{2}, df.x_cnt(2), 'column');
%# if (isempty (indc) && df.x_cnt(2) > 0)
%# this is not an initial assignment
%# df = df; return;
else
[indc, ncol] = deal ([]);
end
else
mz = max (cellfun (@length, df.x_rep));
[fullindr, fullindc, fullinds] = ind2sub ([df.x_cnt(1:2) mz], indr);
indr = unique( fullindr); indc = unique (fullindc);
inds = unique (fullinds);
ncol = length (indc);
if (any (inds > 1))
S(1).subs{3} = inds;
end
end
%# avoid passing ':' as selector on the two first dims
if (~isnull (RHS))
S(1).subs{1} = indr; S(1).subs{2} = indc;
end
df = df_matassign (df, S, indc, ncol, RHS);
end
%# disp ('end of subsasgn'); keyboard
end
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