MATLAB Programming

3 Basic Program Components
Function Description Example
any(A)
all(A)
Returns 1 for a vector where any element
of the vector is true (nonzero), and 0 if no
elements are true.
Returns 1 for a vector where all elements of
the vector are true (nonzero), and 0 if all
elements are not true.
any(A) ans = 0
1 1
all(A) ans = 0
1 0
Note The all and any functions ignore any NaN values in the input arrays.
Short-Circuiting in Elementwise Operators. When used in the context of
an if or while expression, and only in this context, the elementwise | and &
operators use short-circuiting in evaluating their expressions. That is, A|B
and A&B ignore the second operand, B, if the first operand, A, issufficientto
determine the result.
So, although the statement 1|[] evaluates to false, thesamestatement
evaluates to true when used in either an if or while expression:
A = 1; B = [];
if(A|B) disp 'The statement is true',
The statement is true
end;
while the reverse logical expression, which does not short-circuit, evaluates
to false
if(B|A) disp 'The statement is true',
end;
Another example of short-circuiting with elementwise operators shows that a
logical expression such as the following, which under most circumstances is
invalid due to a size mismatch between A and B,
A = [1 1]; B = [2 0 1];
A|B % This generates an error.
works within the context of an if or while expression:
if (A|B) disp 'The statement is true',
end;
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