MATLAB: Subscripted assignment dimension mismatch.

errorMATLABname

I have the vector price <1xn struct> in which we have a several information about a price of a stock. I want to have a vector in which we have all tickers name of the stock, with the following:

 nome=zeros(size(price));
   for t=1:size(price,2);
       nome(1,t)= price(1, t).Ticker;
   end

but I have the error: Subscripted assignment dimension mismatch.

Best Answer

It is not possible to have a vector of strings in MATLAB, because strings are really vectors of characters. You will need to use cell arrays of strings:

nome{1,t} = price(1, t).Ticker;

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: Huge problem when I import data from Yahoo

You are right about the cause. Do you really need to have ticker codes used as field names? Why not using a more basic cell array, and work with ticker indices in the cell array of tickers, rather than with their codes? For example:

 for k = 1:3
    Price{k} = fetch(C, ticker(k), 'Adj Close', 'Jan 5 10', 'Aug 1 13', 'm');
    temp = Price{k};
    ClosePrice(:,k) = temp(:,2);
 end

(not that I use k as a loop index instead of i, as i and j should be reserved for complex numbers)

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: Huge problem when I import data from Yahoo

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