A == B returns
a logical array with elements set to logical 1 (true)
where arrays A and B are equal;
otherwise, the element is logical 0 (false).
The test compares both real and imaginary parts of numeric arrays. eq returns
logical 0 (false) where A or B have
NaN or undefined categorical elements.

eq(A,B) is
an alternative way to execute A == B, but is rarely
used. It enables operator overloading for classes.

A — Left arrayscalar | vector | matrix | multidimensional array

Left array, specified as a scalar, vector, matrix, or multidimensional
array. Inputs A and B must be
the same size unless one is a scalar. A scalar value expands to be
the same size as the other array.

If one input is a categorical array, the other input can be
a categorical array, a cell array of strings, or a single string.
A single string expands into a cell array of strings of the same size
as the other input. If both inputs are ordinal categorical arrays,
they must have the same sets of categories, including their order.
If both inputs are categorical arrays that are not ordinal, they can
have different sets of categories. See Compare Categorical Array Elements for more details.

If one input is a datetime array, the other input can be a datetime
array, a date string, or a cell array of date strings.

If one input is a duration array, the other input can be a duration
array or a numeric array. The operator treats each numeric value as
a number of standard (86400 s) days.

B — Right arrayscalar | vector | matrix | multidimensional array

Right array, specified as a scalar, vector, matrix, or multidimensional
array. Inputs A and B must be
the same size unless one is a scalar. A scalar value expands to be
the same size as the other array.

If one input is a categorical array, the other input can be
a categorical array, a cell array of strings, or a single string.
A single string expands into a cell array of strings of the same size
as the other input. If both inputs are ordinal categorical arrays,
they must have the same sets of categories, including their order.
If both inputs are categorical arrays that are not ordinal, they can
have different sets of categories. See Compare Categorical Array Elements for more details.

If one input is a datetime array, the other input can be a datetime
array, a date string, or a cell array of date strings.

If one input is a duration array, the other input can be a duration
array or a numeric array. The operator treats each numeric value as
a number of standard (86400 s) days.

When comparing handle objects, use == to
test whether objects have the same handle. Use isequal to
determine if objects with different handles have equal property values.