MATLAB: Error with ismember! help me

codeifismember

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.

Best Answer

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.

Related Solutions

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

The message seems quite clear: you are providing a cell array to ismember, but it is not cell arrays of strings. The function ismember accepts certain combinations of input variable classes, as its documentation explains:

" B must belong to the same class as A with the following exceptions:"

"logical, char, and all numeric classes can combine with double arrays."
"Cell arrays of strings can combine with char arrays."
...

Read your code:

looking_up is defined with looking_up=couple(ii,:), and your notes say is "couple is a string array nx2". So looking_up is a char array.
ff is defined as ff=[nomes;cl]. It is not clear what class nomes has, but cl is defined from as cl=num2cell(prices), where prices=zeros(...), so cl is clearly a cell array of numerics (and not a cell array of strings!)

So you are trying to call ismember on:

looking_up, a char array.
ff, a mixed cell array containing something (char?) and numerics.

There is no case listed in the documentation that supports this combination. As the documentation states, ismember works on two cell arrays of strings, or a char array and a cell array of strings, or on two numeric arrays, or a numeric array and a char array, but not on this mixture that you are attempting.

MATLAB: This message error

cadf does not seem to be an inbuilt MATLAB function, and you give no information about how it is defined or the output that it returns. And you also don't give us the complete error message (which tell us the line), so we have to also guess where this error is occurring in your code.

I like guessing games, so lets try.

First you define

M_coint=zeros(n,n);

which means M_coint is a matrix of class double. Then if we assume that cadf returns a structure, then the line

M_coint(i,j)=cadf(...)

will try to allocate that structure to M_coint.

Ouch! Allocating a structure to a double is an error! It does not work.

Best Answer

Related Solutions

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

MATLAB: This message error

Related Question