Matlab Logical Operations

Logical Operations

A logical operation applies a logical operator or logical function to logical values.

• Here a “logical value” is the generalized one—any non-zero numeric value or any non-char(0) character is treated as logical true (1); that is, x is treated as logical(x).

Element-Wise Logical Operations

Operator	Equivalent Function
&	and
~	not

• The AND & and OR | operators are binary; their array operands must satisfy Matlab Compatible Array Sizes
• The NOT ~ operator is unary

Other Element-Wise Logical Functions

• XOR: xor
• & extends to the function all
• | extends to the function any, with the same usage as all

Short-Circuit Logical Operations

Operator	Description
&&	Lazy version of &

• The existence of short-circuit operators implies that the element-wise logical operations always evaluate both operands in full
• Prefer short-circuit operators in general; they are required whenever the second expression depends on the first being true

  • For example:

    >> a = "a";
    >> isnumeric(a) && (1/a > 3)
    ans =
      logical
       0
    >> (a ~= 0) & (1/a > 3) 
    Error using /
    Arguments must be numeric, char, or logical.