MATLAB Function Reference Volume 1: A - E - Bad Request

Logical Operators & | ~
expression a|b&c is evaluated as a|(b&c). It is a good idea to use parentheses
to explicitly specify the intended precedence of statements containing
combinations of & and |.
Partial Evaluation
Within the context of an if or while expression, MATLAB does not necessarily
evaluate all parts of a logical expression. In some cases it is possible, and often
advantageous, to determine whether an expression is true or false through only
partial evaluation.
For example, if A equals zero in statement 1 below, then the expression
evaluates to false, regardless of the value of B. In this case, there is no need to
evaluate B and MATLAB does not do so. In statement 2, if A is nonzero, then
the expression is true, regardless of B. Again, MATLAB does not evaluate the
latter part of the expression.
1) if (A & B) 2) if (A | B)
You can use this property to your advantage to cause MATLAB to evaluate a
part of an expression only if a preceding part evaluates to the desired state.
Examples Here are some examples of using partial evaluation.
while (b ~= 0) & (a/b > 18.5)
if exist('myfun.m') & (myfun(x) >= y)
if iscell(A) & all(cellfun('isreal', A))
See Also all, any, find, logical, xor
The relational operators: =, ==, ~=ì
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