Getting this error : Operator '==' is not supported for operands of type 'cell'. what should I do?

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Dhaval
Dhaval 2023-7-12
回答： Michael Hubatka 2023-7-12
function [ output_array ] = Klammer_Koordinate_Trennung( input_str )
for i= 1:length(input_str)
if input_str(i) == '('
index_1 = i;
end
if input_str(i) == ','
index_2 = i;
end
if input_str(i) == ')'
index_3 = i;
break;
end
end
output_array = [str2num(input_str(index_1 + 1 :index_2 - 1)),...
str2num(input_str(index_2 + 1 : index_3 - 1 ))];
end

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回答（3 个）

Torsten
Torsten 2023-7-12
Dirk Engel
Dirk Engel 2023-7-12
Your function is designed to work when the input argument is a char vector, e.g. '(1,2)', but the error indicates that your function instead gets called with a cell array, e.g., {'(1,2)'}.
If the cell array contains a single char vector, you could add the following line to the top of your function to extract the char vector from the cell:
if iscell(input_str)
input_str = input_str{1}
end
If the cell arrray contains multiple elements, consider a second outer loop over the elements of the cell array.
Note that there are builtin ways to extract numbers from formatted text, such as sscanf() or textscan(). E.g.,
sscanf('(1.1,2.2)', '(%f,%f)', [1, 2])
extracts [1.1, 2.2] from the formatted string.
Michael Hubatka
Michael Hubatka 2023-7-12
Ran in:
Use regular expressions, for example
str2double(regexp("(1, 2)", "\d+", "match"))
ans = 1×2
1 2
for integer only and
str2double(regexp("(1.2, 3)", "\d+\.?\d*", "match"))
ans = 1×2
1.2000 3.0000
for floating point and integers.

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