removefimath

Remove fimath object from fi object

Description

example

y = removefimath(x) returns a fi object y with x’s numerictype and value, and no fimath object attached. You can use this function as y = removefimath(y), which gives you localized control over the fimath settings. This function also is useful for preventing errors about embedded.fimath of both operands needing to be equal.

Examples

collapse all

This example shows how to define a fi object, define a fimath object, attach the fimath object to the fi object and then, remove the attached fimath object.

a = fi(pi)
a =
3.1416

DataTypeMode: Fixed-point: binary point scaling
Signedness: Signed
WordLength: 16
FractionLength: 13
f = fimath('RoundingMethod','Floor','OverflowAction','Wrap');
a = setfimath(a,f)
a =
3.1416

DataTypeMode: Fixed-point: binary point scaling
Signedness: Signed
WordLength: 16
FractionLength: 13

RoundingMethod: Floor
OverflowAction: Wrap
ProductMode: FullPrecision
SumMode: FullPrecision
b = removefimath(a)
b =
3.1416

DataTypeMode: Fixed-point: binary point scaling
Signedness: Signed
WordLength: 16
FractionLength: 13

Use the pattern x = setfimath(x,f) and y = removefimath(y) to insulate variables from fimath settings outside the function. This pattern does not create copies of the data in generated code.

function y = fixed_point_32bit_KeepLSB_plus_example(a,b)
f = fimath('OverflowAction','Wrap',...
'RoundingMethod','Floor',...
'SumMode','KeepLSB',...
'SumWordLength',32);
a = setfimath(a,f);
b = setfimath(b,f);
y = a + b;
y = removefimath(y);
end

If you have the MATLAB® Coder™ product, you can generate C code. This example generates C code on a computer with 32-bit, native integer type.

a = fi(0,1,16,15);
b = fi(0,1,16,15);
codegen -config:lib  fixed_point_32bit_KeepLSB_plus_example...
-args {a,b} -launchreport

int fixed_point_32bit_KeepLSB_plus_example(short a, short b)
{
return a + b;
}

Input Arguments

collapse all

Input data, specified as a fi object or built-in integer, from which to copy the data type and value to the output. x must be a fi object or an integer data type (int8, int16, int32, int64, uint8, uint16, uint32, or uint64). If x is not a fi object or integer data type, then y = x.

Output Arguments

collapse all

Output fi object, returned as a fi object with no fimath object attached. The data type and value of the output match the input. If the input, x, is not a fi object y = x.

Extended Capabilities

C/C++ Code GenerationGenerate C and C++ code using MATLAB® Coder™. 