Combine Strrep in one Line.

Hi, is there any way that i Combine strrep as one line in my Code for different values. for example.

a = strrep(a, 'x','y'); a = strrep(a, 'z','w');

Answer 1

[KL]

use replace with cell arrays,

https://www.mathworks.com/help/matlab/ref/replace.html

a = 'abcxyz'
old = {'x';'z'};
new = {'y';'w'};
a = replace(a, old,new)

[FishermanJack]

sorry, that does not work for me

[KL]

sorry, that does not work for me

What does it mean? Do you get an error message?

My guess would be that you're using a matlab version older than 2016b. Anywayt try regexprep,

 a = regexprep(a, old,new);

[FishermanJack]

yes, thanks,regexprep does the Job very well. :D

Answer 2

[Jan]

has = 'xy';
rep = 'zw';
[Lia, Locb] = ismember(a, has);
a(Lia) = rep(Locb);

[EDITED] I assume strrep has less overhead. For many changes, a lookup table will be more efficient:

function s = StrRepList(s, old, new)
if numel(old) < 20   % GUESSED limit!
  for k = 1:numel(old)
    s = strrep(s, old(k), new(k));
  end
else
  lut          = char(0):char(255);
  lut(old + 1) = new;
  s            = lut(s + 1);
end
end

Some tests with tic/toc will help to find a suitable limit to decide for a strrep loop or a lookup table method. Maybe it depends on the size of s also.

[FishermanJack]

i will try this because regexprep is much slower than strrep..

[FishermanJack]

i implented this in my Code, but as i see with tic/toc the most efficient way is with strrep. thank you anyway