MATLAB: Is isstr not recommended

charischarisstrMATLABstring

When using isstr in my code, I get a warning that it is not recommended and I should use ischar instead. But ischar doesn't provide the same functionality as isstr. For a string, ischar returns 0 and isstr returns 1, while for a character array, ischar returns 1 and isstr returns 1. There doesn't seem to be any replacement for isstr that provides the same functionality. Why is this warning displayed?

Best Answer

The string (link) datatype was introduced in R2016b, along with a number of functions to work with it, of which isstring (link) is one. I suspect the recommendations for isstr changed to be compatible with the new datatype, and avoid any ambiguity.

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MATLAB: How to check if string contains some special character

For #1 you could use isstrprop().

For #2, see startsWith(str, '_') and endsWith(str, '_')

For #3, you can use find():

indexes = strfind(str, '__');

For #4 you could do something like

if str(1) >= '0' && str(1) <= '9'
    % str starts with a numerical digit.
else
    % str does not start with a numerical digit.
end

MATLAB: String array can not be recognized by ISCHAR

because it's a cell variable

iscell(A)
 ans =
     1
B={'This is the first line.';'This is the second line.';'This is the third line.'};
%B is a cell variable; why  A = cellstr(B(2))
A = B(2)     % is enough

% maby you wanted

 A=char(B(2))
 ischar(A)

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Related Solutions

MATLAB: How to check if string contains some special character

MATLAB: String array can not be recognized by ISCHAR

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