Error with ismember! help me

siz=size(couple,1);
hlife=zeros(siz,1);
adf=zeros(siz,1);
correlation=zeros(siz,1);
sharpe_res=zeros(siz,1);
mcoint=zeros(siz,1);
performance_k=zeros(siz,1);
sharpe_k=zeros(siz,1);
performance_res=zeros(siz,1);
cl=num2cell(prices);
ff=[nomes;cl];
%%start*
for ii=1:size(couple,1);
  looking_up=couple(ii,:);
  [tf, coldix]=ismember(looking_up,f(ii,:));
  prices=ff(:,coldix(tf));
  prices=prices(2:end,:);
  prices=cell2mat(prices);
  x=prices(:,2);
  y=prices(:,1);
  x=flipud(x);
  y=flipud(y);
  step1
  performance_res(ii,1)=paperoni_o_pezzenti;
  hlife(ii,1)=halflife;
  adf(ii,1)=results.adf;
  correlation(ii,1)=ccor;
  sharpe_res(ii,1)=sharpe;
  sharpe_k(ii,1)=ksharpe;
  performance_k(ii,1)=paperoni_o_pezzentik;
  mcoint(ii,1)=m_coint;
end

Matlab give me the following error:

Input A of class cell and input B of class cell must be cell arrays of strings, unless one is a string.

[Geoff Hayes]

fede - what are the variables couple and f? Are they cell arrays or arrays of doubles or...? Please describe the contents for each as it isn't clear from the above code how each is defined.

[fede]

Hi f is a cell array, in where in the first row ther's string elements, and in the other row number.

[fede]

couples is a matrix nx2 in which for each row ther's two strings, for example

n_1 N_2
n_3 n_4

and so on

Answer 1

[Image Analyst]

Like Geoff and the error message says, it's probably got something else in the cells than only strings. Please read the FAQ first, and then fix your code: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

Also, I don't know what's going on in this code, despite an abundance of comments, but I bet a table would be a better and easier choice than a cell array.