Creating a new object from existing object but after excluding one specific property.

Hi All,

I want to copy an object from exsiting object but don't want to copy all the properties, more specifically one perticular property.

Problem i am facing is that i don't know all the perperties exisiting in the object from which i am copying. But if there is this one property in this object, i want to exclude it and copy rest of the object to the new object. For example i have obj1:

function obj1 = obj1
obj1.A = 10;
obj1.B = 20;
obj1.C = 30;
end

And now i copy this object to a new obj:

x = obj1
y = obj2(x)

function obj2 = obj2(x)
obj2 = x(x.*!=x.C)
end

In second part of code, line number 5 has syntax error on purpose to represent what i want. I

Answer 1

[J. Alex Lee]

If you actually mean structures, as your example suggests, are you aware of "isfield", which will check if a structure contains a particular field name?

If you actually mean objects/classes, then there is "isprop" to check if a particular property exists.

[Walter Roberson]

also rmfield. Which does not itself change the input so you can just

obj2 = rmfield(obj1, 'C')

[Walter Roberson]

If you are working with class objects then removing any static property requires creating a new class. For class objects removing a property only makes sense for dynamic properties.

[Walter Roberson]

On some cases it might make sense to subclass from mixins and implement a copy method excluding particular properties.

https://www.mathworks.com/help/matlab/ref/matlab.mixin.copyable-class.html

[Deepak Gupta]

Thanks Alex and Walter, this is what i was looking for.