MATLAB Programming

Numeric Types
Infinity and NaN Functions
See Infinity and NaN Functions on page 2-31 for a list of functions most
commonly used with inf and NaN in MATLAB.
Identifying Numeric Types
You can check the data type of a variable x using any of these commands.
Command
Operation
whos x Display the data type of x.
xType = class(x);
isnumeric(x)
isa(x, 'integer')
isa(x, 'uint64')
isa(x, 'float')
isa(x, 'double')
isa(x, 'single')
isreal(x)
isnan(x)
isinf(x)
isfinite(x)
Assignthedatatypeofx to a variable.
Determine if x is a numeric type.
Determine if x is the specified numeric type.
(Examples for any integer, unsigned 64-bit integer,
any floating point, double precision, and single
precision are shown here).
Determine if x is real or complex.
Determine if x is Not a Number (NaN).
Determine if x is infinite.
Determine if x is finite.
Display Format for Numeric Values
By default, MATLAB displays numeric output as 5-digit scaled, fixed-point
values. You can change the way numeric values are displayed to any of the
following:
• 5-digit scaled fixed point, floating point, or the best of the two
• 15-digit scaled fixed point, floating point, or the best of the two
• A ratio of small integers
• Hexadecimal (base 16)
• Bank notation
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