How to use Comparison tags inside my class? or any other operators?

Question

safaa saber 2021-10-17

0
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编辑： safaa saber 2021-10-18

Hello Every one...

I am new to matlab classes, i write this one to parse data that come after the charcter searching for. when i run this code:

s= ParseData;
b = ParseData;
b.char = 'D';
s.data = 'D123 X12';
parseData(b,s)

this error occur

((Operator '==' is not supported for operands of type 'ParseData'.))

here is my class code:

classdef ParseData
        properties
        char
        data
        end
        %%%%%%%%%%%%%%%%%%
        methods
            function  parseData(obj1,obj2)
                     num = '';
                     for i = 1:length(obj2)
                        k = i;
                        if(obj2(i) == obj1)
                           while 1
                                k = k + 1;
                                num = num + obj2(k);
                                if(obj2(k+1)==' ' || obj2(k+1)=='.' || obj2(k+1)=='-')
                                    break;
                                end
                           end
                        end
                     end
           end
        end
end

code any one help with this error pleas?.

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Answer 1

Steven Lord 2021-10-17

1
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You haven't defined what it means to perform the == operator (whose function name is eq) on instances of your class.

Did you instead mean to compare parts of the properties of your objects? For instance did you want to compare part or all of the data property of your objects?

if(obj2.data(i) == obj1.data)

Though for that you'd probably want to ask if any of the elements in obj1.data matched.

if any(obj2.data(i) == obj1.data)