removefimath

Remove fimath object from fi object

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Syntax

y = removefimath(x)

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

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Open Live Script

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

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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

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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 Generation
Generate C and C++ code using MATLAB® Coder™.

See Also

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Introduced in R2012b

Fixed-Point Designer Documentation

Support