eq (MATLAB Functions)

Test for equality

Syntax

```
A == B
eq(A, B)
```

Description

A == B compares each element of array A for equality with the corresponding element of array B, and returns an array with elements set to logical 1 (true) where A and B are equal, or logical 0 (false) where they are not equal. Each input of the expression can be an array or a scalar value.

If both A and B are scalar (i.e., 1-by-1 matrices), then MATLAB returns a scalar value.

If both A and B are nonscalar arrays, then these arrays must have the same dimensions, and MATLAB returns an array of the same dimensions as A and B.

If one input is scalar and the other a nonscalar array, then the scalar input is treated as if it were an array having the same dimensions as the nonscalar input array. In other words, if input A is the number 100, and B is a 3-by-5 matrix, then A is treated as if it were a 3-by-5 matrix of elements, each set to 100. MATLAB returns an array of the same dimensions as the nonscalar input array.

eq(A, B) is called for the syntax A == B when either A or B is an object.

Examples

Create two 6-by-6 matrices, A and B, and locate those elements of A that are equal to the corresponding elements of B:

A = magic(6);
B = repmat(magic(3), 2, 2);

A == B
ans =
     0     1     1     0     0     0
     1     0     1     0     0     0
     0     1     1     0     0     0
     1     0     0     0     0     0
     0     1     0     0     0     0
     1     0     0     0     0     0

See Also

ne, le, ge, lt, gt, relational operators

eps erf, erfc, erfcx, erfinv, erfcinv