The numerictype Structure

On this page…
Valid Values for numerictype Structure Properties Properties That Affect the Slope Stored Integer Value and Real World Value

Valid Values for numerictype Structure Properties

The numerictype object contains all the data type and scaling attributes of a fixed-point object. The numerictype object behaves like any MATLAB structure, except that it only lets you set valid values for defined fields. The following table shows the possible settings of each field of the structure.

Note   When you create a fi object, any unspecified field of the numerictype object reverts to its default value. Thus, if the DataTypeMode is set to unspecified scaling, it defaults to binary point scaling when the fi object is created. If the Signedness property of the numerictype object is set to Auto, it defaults to Signed when the fi object is created.

DataTypeMode	DataType	Scaling	Signedness	Word- Length	Fraction- Length	Slope	Bias
Fixed-point data types
Fixed-point: binary point scaling	Fixed	BinaryPoint	Signed Unsigned Auto	Positive integer from 1 to 65,536	Positive or negative integer	2^(-fraction length)	0
Fixed-point: slope and bias scaling	Fixed	SlopeBias	Signed Unsigned Auto	Positive integer from 1 to 65,536	N/A	Any floating- point number	Any floating- point number
Fixed-point: unspecified scaling	Fixed	Unspecified	Signed Unsigned Auto	Positive integer from 1 to 65,536	N/A	N/A	N/A
Scaled double data types
Scaled double: binary point scaling	ScaledDouble	BinaryPoint	Signed Unsigned Auto	Positive integer from 1 to 65,536	Positive or negative integer	2^(-fraction length)	0
Scaled double: slope and bias scaling	ScaledDouble	SlopeBias	Signed Unsigned Auto	Positive integer from 1 to 65,536	N/A	Any floating- point number	Any floating- point number
Scaled double: unspecified scaling	ScaledDouble	Unspecified	Signed Unsigned Auto	Positive integer from 1 to 65,536	N/A	N/A	N/A
Built-in data types
Double	double	N/A	1 true	64	0	1	0
Single	single	N/A	1 true	32	0	1	0
Boolean	boolean	N/A	0 false	1	0	1	0

You cannot change the numerictype properties of a fi object after fi object creation.

Back to Top

Properties That Affect the Slope

The Slope field of the numerictype structure is related to the SlopeAdjustmentFactor and FixedExponent properties by

The FixedExponent and FractionLength properties are related by

If you set the SlopeAdjustmentFactor, FixedExponent, or FractionLength property, the Slope field is modified.

Back to Top

Stored Integer Value and Real World Value

The numerictype StoredIntegerValue and RealWorldValue properties are related according to

which is equivalent to

If any of these properties is updated, the others are modified accordingly.

Back to Top

numerictype Object Properties

Using numerictype Objects to Share Data Type and Scaling Settings of fi objects

© 1984-2012- The MathWorks, Inc.    -   Site Help   -   Patents   -   Trademarks   -   Privacy Policy   -   Preventing Piracy   -   RSS