MATLAB: Calling characters from character arrays

calling characters

I have an charecter array that contains so many characters and I want to call 4 th character from each row. How can I do it ?

For example consider that I have 6×1 character matrix like

Adana 
mersin
hatay
iskenderun
cemre
cebir

I want to call 4 th character of each row and form a new 6×1 matrix with them like

n
s
a
e
r
i

Best Answer

str='adana mersin hatay iskenderun cemre cebir';
str=regexp(str,'[a-z]*','match');
for i=1:numel(str)
    a{i}=str{i}(4);
end

or instead of for loop:

 cellfun(@(x) x(4),str)

EDIT:

After Guillaume's warning, different and easier approach for constructing the demo data and solution:

str='adana mersin hatay iskenderun cemre cebir';
str=strsplit(str,' ');
cellfun(@(x) x(4),str)

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MATLAB: How to use unique function here

inn_A = [A{:}];
str_A = cellfun(@(x)num2str(x(:)'),inn_A,'UniformOutput',false);
[~,idx,idx2] = unique(str_A);
Result = inn_A(idx);

MATLAB: Does STRMATCH in MATLAB cause an error for a cell array containing a numeric value

In this example:

str = 9;
strs = strvcat('This is a string array','with two rows');
ind = strmatch(str,strs);

the normal STRMATCH is used, since the first input is not a cell array. In this case, 9 could be used as an ASCII value, and converted to a tab character. That character can then be compared with the other strings.

In this example:

str ={9};
strs = strvcat('This is a cell array of strings','with two rows');
ind = strmatch(str,strs);

@CELL/STRMATCH will be used, since the first input is a cell array. In this case, the code checks that the cell array contains strings, and converts it to a char array:

if iscellstr(str), str = char(str); end

Cell arrays of strings are special cases of cell arrays, which are commonly used to store strings together which have different lengths, and there are many instances where cell arrays of strings and strings can be used interchangeably. However, {9} is not a cell array of strings, so it is not converted to a character array, which leads to the error being thrown by this code:

if ~ischar(str) | ~ischar(strs)
    error('Requires character array or cell array of strings as inputs.')
end

Best Answer

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MATLAB: How to use unique function here

MATLAB: Does STRMATCH in MATLAB cause an error for a cell array containing a numeric value

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