How Do I compare classes without having an error

>> Array_1 = [1 inf -inf]; Array_2 = [1 2 inf]; Class_double = [0] ; Class_string = 'hi'; Class_boolean = [true];

if class(Array_1) == class(Class_string) & class(Array_2) == class(Class_string)

[Array_1 ' ' Array_2]

elseif class(Array_1) == class(Class_double) & class(Array_2) == class(Class_double)

positive_1 = Array_1 == inf; negative_1 = Array_1 == -inf; positive_2 = Array_2 == inf; negative_2 = Array_2 == -inf;

if sum(positive_1(:)) > 0 & sum(negative_1(:)) > 0

disp 'there is an infinity and negative infinity in Array 1'

elseif sum(positive_1(:)) > 0

disp 'there is an infinity in Array 1'

elseif sum(negative_1(:)) > 0

disp 'there is a negative infinity in Array 1'

else

disp 'there is no infinity or negative infinity in Array 1'

end

if sum(positive_2(:)) > 0 & sum(negative_2(:)) > 0

disp 'there is an infinity and negative infinity in Array 2'

elseif sum(positive_2(:)) > 0

disp 'there is an infinity in Array 2'

elseif sum(negative_2(:)) > 0

disp 'there is a negative infinity in Array 2'

else

disp 'there is no infinity or negative infinity in Array 2'

end

elseif class(Array_1) == class(Class_boolean) & class(Array_2) == class(Class_boolean)

Message = Array_1 & Array_2

disp (message)

else

disp ('they are not of the same class')

end

[Daniel Chan]

trying to compare the classes and execute the command if it is true but it says arrays have incompatible sizes for this operation if it has a class different from the first if statement

Answer 1

[Steven Lord]

Either use isequal or (especially if class hierarchies are involved) use isa.

x = 5;
y = int8(3);
z = 42;
f = figure;
isequal(class(x), class(y)) % false, 'double' is not equal to 'int8'

ans = logical
   0

isa(x, class(z)) % true, x isa 'double'

ans = logical
   1

isa(f, 'handle') % true, f is a Figure, but the Figure class inherits from the handle class

ans = logical
   1

% Since 'double' and 'int8' have different numbers of characters you can't
% compare them using ==
class(x) == class(y) % error

Arrays have incompatible sizes for this operation.