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biosig_str2double.m
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biosig_str2double.m
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function [num,status,strarray] = biosig_str2double(s,cdelim,rdelim,ddelim)
%% STR2DOUBLE converts strings into numeric values
%% [NUM, STATUS,STRARRAY] = STR2DOUBLE(STR)
%%
%% Because of a name space conflict, this function is renamed to
%% BIOSIG_STR2DOUBLE(...). An alternative is STR2ARRAY from the NaN-toolbox.
%%
%% STR2DOUBLE can replace STR2NUM, but avoids the insecure use of EVAL
%% on unknown data [1].
%%
%% STR can be the form '[+-]d[.]dd[[eE][+-]ddd]'
%% d can be any of digit from 0 to 9, [] indicate optional elements
%% NUM is the corresponding numeric value.
%% if the conversion fails, status is -1 and NUM is NaN.
%% STATUS = 0: conversion was successful
%% STATUS = -1: couldnot convert string into numeric value
%% STRARRAY is a cell array of strings.
%%
%% Elements which are not defined or not valid return NaN and
%% the STATUS becomes -1
%% STR can be also a character array or a cell array of strings.
%% Then, NUM and STATUS return matrices of appropriate size.
%%
%% STR can also contain multiple elements.
%% default row-delimiters are:
%% NEWLINE, CARRIAGE RETURN and SEMICOLON i.e. ASCII 10, 13 and 59.
%% default column-delimiters are:
%% TAB, SPACE and COMMA i.e. ASCII 9, 32, and 44.
%% default decimal delimiter is '.' char(46), sometimes (e.g in
%% Tab-delimited text files generated by Excel export in Europe)
%% might used ',' as decimal delimiter.
%%
%% [NUM, STATUS] = STR2DOUBLE(STR,CDELIM,RDELIM,DDELIM)
%% CDELIM .. [OPTIONAL] user-specified column delimiter
%% RDELIM .. [OPTIONAL] user-specified row delimiter
%% DDELIM .. [OPTIONAL] user-specified decimal delimiter
%% CDELIM, RDELIM and DDELIM must contain only
%% NULL, NEWLINE, CARRIAGE RETURN, SEMICOLON, COLON, SLASH, TAB, SPACE, COMMA, or ()[]{}
%% i.e. ASCII 0,9,10,11,12,13,14,32,33,34,40,41,44,47,58,59,91,93,123,124,125
%%
%% Examples:
%% str2double('-.1e-5')
%% ans = -1.0000e-006
%%
%% str2double('.314e1, 44.44e-1, .7; -1e+1')
%% ans =
%% 3.1400 4.4440 0.7000
%% -10.0000 NaN NaN
%%
%% line ='200,300,400,NaN,-inf,cd,yes,no,999,maybe,NaN';
%% [x,status]=str2double(line)
%% x =
%% 200 300 400 NaN -Inf NaN NaN NaN 999 NaN NaN
%% status =
%% 0 0 0 0 0 -1 -1 -1 0 -1 0
%%
%% Reference(s):
%% [1] David A. Wheeler, Secure Programming for Linux and Unix HOWTO.
%% http://en.tldp.org/HOWTO/Secure-Programs-HOWTO/
%% This program 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 2
%% of the License, or (at your option) any later version.
%%
%% This program 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 program; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
%% Copyright (C) 2004,2008,2020 by Alois Schloegl <alois.schloegl@gmail.com>
%% This function is part of Biosig https://biosig.sourceforge.io
FLAG_OCTAVE = exist('OCTAVE_VERSION','builtin');
VER = version;
% valid_char = '0123456789eE+-.nNaAiIfF'; % digits, sign, exponent,NaN,Inf
valid_delim = char(sort([0,9:14,32:34,abs('()[]{},;:"|/')])); % valid delimiter
if nargin < 1,
error('missing input argument.')
end;
if nargin < 2,
cdelim = char([9,32,abs(',')]); % column delimiter
else
% make unique cdelim
cdelim = char(sort(cdelim(:)));
tmp = [1;1+find(diff(abs(cdelim))>0)];
cdelim = cdelim(tmp)';
end;
if nargin < 3,
rdelim = char([0,10,13,abs(';')]); % row delimiter
else
% make unique rdelim
rdelim = char(sort(rdelim(:)));
tmp = [1;1+find(diff(abs(rdelim))>0)];
rdelim = rdelim(tmp)';
end;
if nargin<4,
ddelim = '.';
elseif length(ddelim)~=1,
error('decimal delimiter must be exactly one character.');
end;
% check if RDELIM and CDELIM are distinct
delim = sort(abs([cdelim,rdelim,ddelim]));
tmp = [1; 1 + find(diff(delim')>0)]';
delim = delim(tmp);
%[length(delim),length(cdelim),length(rdelim)]
if length(delim) < (length(cdelim)+length(rdelim))+1, % length(ddelim) must be one.
error('row, column and decimal delimiter are not distinct.');
end;
% check if delimiters are valid
tmp = sort(abs([cdelim,rdelim]));
flag = zeros(size(tmp));
k1 = 1;
k2 = 1;
while (k1 <= length(tmp)) && (k2 <= length(valid_delim)),
if tmp(k1) == valid_delim(k2),
flag(k1) = 1;
k1 = k1 + 1;
elseif tmp(k1) < valid_delim(k2),
k1 = k1 + 1;
elseif tmp(k1) > valid_delim(k2),
k2 = k2 + 1;
end;
end;
if ~all(flag),
error('Invalid delimiters!');
end;
%%%%% various input parameters
if isnumeric(s)
if all(s<256) && all(s>=0)
s = char(s);
else
error('STR2DOUBLE: input variable must be a string')
end;
end;
num = [];
status = 0;
strarray = {};
if isempty(s),
return;
elseif iscell(s),
strarray = s;
elseif ischar(s)
if all(size(s)>1), %% char array transformed into a string.
for k = 1:size(s,1),
tmp = find(~isspace(s(k,:)));
strarray{k,1} = s(k,min(tmp):max(tmp));
end;
else %if isschar(s),
num = [];
status = 0;
strarray = {};
s(end+1) = rdelim(1); % add stop sign; makes sure last digit is not skipped
RD = zeros(size(s));
for k = 1:length(rdelim),
RD = RD | (s==rdelim(k));
end;
CD = RD;
for k = 1:length(cdelim),
CD = CD | (s==cdelim(k));
end;
k1 = 1; % current row
k2 = 0; % current column
k3 = 0; % current element
sl = length(s);
ix = 1;
%while (ix < sl) & any(abs(s(ix))==[rdelim,cdelim]),
while (ix < sl) && CD(ix),
ix = ix + 1;
end;
ta = ix; te = [];
while ix <= sl;
if (ix == sl),
te = sl;
end;
%if any(abs(s(ix))==[cdelim(1),rdelim(1)]),
if CD(ix),
te = ix - 1;
end;
if ~isempty(te),
k2 = k2 + 1;
k3 = k3 + 1;
if te<ta,
strarray{k1,k2} = [];
else
strarray{k1,k2} = s(ta:te);
end;
%strarray{k1,k2} = [ta,te];
flag = 0;
%while any(abs(s(ix))==[cdelim(1),rdelim(1)]) & (ix < sl),
while CD(ix) && (ix < sl),
flag = flag | RD(ix);
ix = ix + 1;
end;
if flag,
k2 = 0;
k1 = k1 + 1;
end;
ta = ix;
te = [];
end;
ix = ix + 1;
end;
end;
else
error('STR2DOUBLE: invalid input argument');
end;
[nr,nc]= size(strarray);
status = zeros(nr,nc);
num = repmat(NaN,nr,nc);
for k1 = 1:nr,
for k2 = 1:nc,
t = strarray{k1,k2};
if (length(t)==0),
status(k1,k2) = -1; %% return error code
num(k1,k2) = NaN;
else
%% get mantisse
g = 0;
v = 1;
if t(1)=='-',
v = -1;
l = min(2,length(t));
elseif t(1)=='+',
l = min(2,length(t));
else
l = 1;
end;
if strcmp(lower(t(l:end)),'inf')
num(k1,k2) = v*inf;
elseif strcmp(lower(t(l:end)),'nan');
num(k1,k2) = NaN;
else
if ddelim=='.',
t(t==ddelim)='.';
end;
if FLAG_OCTAVE, %% Octave
[v,tmp2,c] = sscanf(char(t),'%f %s','C');
elseif all(VER(1:2)=='3.') && any(VER(3)=='567'); %% FreeMat 3.5, 3.6, 3.7
[v,c,em] = sscanf(char(t),'%f %s');
c = 1;
else %% Matlab
[v,c,em,ni] = sscanf(char(t),'%f %s');
c = c * (ni>length(t));
end;
if (c==1),
num(k1,k2) = v;
else
num(k1,k2) = NaN;
status(k1,k2) = -1;
end
end
end;
end;
end;