Fundamentals of Modeling, Principles and MATLAB - Environmental Modeling - page 50

Table 2.1 Defining table for
logical operators

or a Input parameter and not xor

A B A & B A | B ~A xor(A,B)

0 0 0 0 1 0

0 1 0 1 1 1

1 0 0 1 0 1

1 1 1 1 0 0

a

The | symbol is reached by Alt-Strg- >

It is also possible to check the type or any other characteristic of a variable. For
that purpose there are several is... keywords (which have at least one variable as
formal parameter):

is oat checks if a variable is a float, i.e. a single or double
islogical checks if a variable is a logical
isscalar checks if variable is a scalar
isvector checks if variable is a vector
is nite checks if variable is finite
isinf checks if variable is infinite
isnan checks if variable is not a number
isnan checks if variable is not a number
isempty checks whether an array is empty
isnan checks if variable is not a number

Look for is* in the help system (see Chap. 1.5) to obtain a complete list of all
such commands.
The if , else and end keywords are reserved and should not be used by the
MATLAB user as function or variable names. The if , else and end keywords are

reserved and should not be used by the MATLAB

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user as function or variable
names. An if without else is just a condition. Using the if - else construction, one
has the option to bifurcate into one of two branches. A bifurcation into several
branches can be realized by using nested if-else commands:

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