appending an empty list

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Eli Borodach
Eli Borodach 2015-10-21
评论： Robert 2015-11-5
Hello all,
my code:
list_rats = [];
append(list_rats, Cell.rat);
when Cell.rat is a string. it throws me:
Error using append (line 39) Wrong number of input arguments for obsolete matrix-based syntax.
What should I do?
Thanks in advance
  2 个评论
Jan
Jan 2015-10-21
What is the function "append"? Does this appear using MuPad? See: http://www.mathworks.com/help/symbolic/mupad_ref/append.html
Eli Borodach
Eli Borodach 2015-10-22
what is mupad? shlould I do include?

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回答（1 个）

Robert
Robert 2015-10-21
The behavior of append is specific to the data types input to it. For the basic types, you are probably better off using
list_rats = [];
a_new_list = [list_rats, Cell.rat];
% or
other_list = [list_rats; Cell.rat];
Also, if you indent your code (two spaces will do) when you type a question, answer, or comment, it will appear in a formatted code block as above.
  2 个评论
Eli Borodach
Eli Borodach 2015-10-22
I have allready tried it. The problem is that I allways add string at length of 16 characters and than when I add string in length of 17 characters it writes:
Error using vertcat
CAT arguments dimensions are not consistent.
Robert
Robert 2015-11-5
You can append strings horizontally regardless of their length, i.e.
>> ['Hello,', ' ', 'World!']
ans =
Hello, World!
But because MATLAB arrays cannot be ragged, vertical concatenation of varying-length strings will produce an error.
>> ['Hello,'; ' '; 'World!']
Error using vertcat
Dimensions of matrices being concatenated are not consistent.
If you are trying to collect a list of strings without combining them into one string, you should try cell arrays.
>> {'Hello', ',', ' ', 'World!'}
ans =
'Hello' ',' ' ' 'World!'
>> {'Hello'; ','; ' '; 'World!'}
ans =
'Hello'
','
' '
'World!'
>> {'Hello', ','; ' ', 'World!'}
ans =
'Hello' ','
' ' 'World!'
Use docsearch cell-arrays to learn more.

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