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function writevars(file, varargin)
% WRITEVARS(file,options,a,b,c,...) writes the variables a, b, c, etc. to the
% file specified in file for later use in a LaTeX document.
% The variable names will be given by their names
% when passed on to writevars. eg. matlab variable 'a' will be passed as '\a' in the tex file
%
% You can also use WRITEVARS to format variables with their corresponding error to the
% correct notation for use in physical reports eg.
%
% A = (101.3 +- 2.4)e4
%
% that is: give the error two significant digits and round the variable so that it's
% last two digits are of the same order of the error.
%
% To make use of this put the variable and it's error in a vector with the variables name:
%
% a = [101.299e10,2.423e10];
% writevars('file.txt',a);
%
% results in the 'file.txt' containing
%
% \Mset{a}{101.3}{2.4}{10}
%
% Use \input{file} in your tex file to gain acces to the variables, eg.
%
% \input{file.txt}
% value of a is \Mnum{a}.
%
% You cannot use temporary variables when using WRITEVARS. This would result in nameless
% variables in the tex file. So don't do:
%
% writevars('file.txt', [101.299, 2.423])
%
% You can use writevars to append variables to the file using the 'a' (append) option, which
% is also implied when no option is given. So both
%
% writevars('file.txt', 'a', a, b, c, ... );
%
% and
%
% writevars('file.txt', a, b, c, ...);
%
% will append the the variable definitions to the file. This is the smart thing to do since
% LaTeX will only use the last of the defined values, and this way you will have a history
% of all the values you have written. This behaviour can be turned off by using
% the 'w' option ('w' for write):
%
% writevars('file.txt','w', a, b, c,...);
%
% will empty the file before writing to it. This can be a good thing if the file is
% becoming overly long, thus slowing tex compilation.
%
% The other options that can be given are:
% a: append (this is default). Latex will use only the last values that were written.
% w: write instead of append. This clears the file before writing.
% s: silent, don't write information to console and refrain from writing a datestring
% to the file.
% e: passes the 'e' option to formatvars.
% #: replace by any number greater than 0. This tells formatvars which number
% of significant digits to use.
%
% you can give these options in random order in the optional options string. eg
%
% writevars(file,'wse4',a,b,c,...);
%
% silently writes the variables to the file with the 'e' option using 4 significant digits.
%
% See also WRITEALLVARS, WRITEMAT, FORMATVARS
appendstr = [ '%%-- ' datestr(now) ' --%%\n'];
% check if any variables were passed at all
if length(varargin) == 0
error('no variables were given');
end
% check if options string was given and if so, parse it using parsemopts.
switch class(varargin{1})
case 'char'
opts=varargin{1};
[append, write, silent, n, e_given] = parsemopts(opts);
s = 2;
case 'double'
[append, write, silent, n, e_given] = parsemopts('');
s = 1;
otherwise
error('Unexpected class in argument 2')
end;
if append
[FID] = fopen(file,'a');
if ~silent
fprintf(FID,appendstr);
disp(['appending variables to ' file])
end
elseif write
[FID] = fopen(file,'w');
if ~silent
fprintf(FID,appendstr);
disp(['writing variables to ' file])
end
end
if e_given
e = 'e';
else
e = '';
end
% loop variables in varargin
for i = s : length(varargin)
% get name of variable
str = inputname(i+1);
% check if this name is good or empty (temporary variable)
if length(str) == 0
error([ 'you cannot use temporary variables for they will ' ...
'have no name on output. \nerror in input argument ' ...
num2str(i+1)]);
end
if ~strcmp(class(varargin{i}),'double')
error(['argument ' num2str(i+1) ' is not of class double']);
end
% check if variables is vector or single variables
if max(size(varargin{i})) == 2
% vector
vec = varargin{i}; % get the inputed vector
a = vec(1); % get first value
s_a = vec(2); % get second value
[A,s_A] = formatvars(a,s_a,[num2str(n) e]); % format the variables using formatvar
eA = strfind(A,'e');
Aexp = '';
if size(eA) > 0
Aexp = A(eA+1:end);
A = A(1:eA-1);
end
es_A = strfind(s_A,'e');
if size(es_A) > 0
s_Aexp = s_A(es_A:end);
s_A = s_A(1:es_A-1);
end
% defstr_s_a = [ '\\Mset{s_' str '}{' s_A '}\n' ];
defstr = [ '\\Mset{' str '}{' A '}{' s_A '}{' Aexp '}\n' ];
elseif size(varargin{i}) == [1 1]
% normal
if e_given
f=e;
else
f = 'g';
end
A = num2str(varargin{i},['%100.' num2str(n) f]); % get value as string
A(strfind(A,'+'))='';
eA = strfind(A,'e');
if size(eA) > 0
Aval = A(1:eA-1);
Aexp = A(eA+1:end);
% remove 0 in front of exponential
if Aexp(1) == '0'
Aexp(1) = '';
end
defstr = [ '\\Mset{' str '}{' Aval '}{}{' Aexp '}\n' ];
else
defstr = [ '\\Mset{' str '}{' A '}\n' ];
end
else
% unknown
error('variable must be of size [1 1] or [1 2]');
end
% print the string
fprintf(FID, defstr);
end
% close the file
fclose(FID);
end
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