Create fi object from Simulink data type
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Eirik Nordeng
on 12 Mar 2024
Answered: Andy Bartlett
on 12 Mar 2024
I am working on documenting a fixed point model and would like to automate as much as possible. I have a script that lists all inputs and outputs and their compiled data types (e.g. sfix27_En29). I would now like to create a fixed point object (fi()) using the data type provided from my simulink model in order to gain access to functions provided with the fixed point object.
Is there a built-in function for creating a fi() object using the Simulink data type descriptor?
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Accepted Answer
Andy Bartlett
on 12 Mar 2024
Hi
Create a numerictype object from the type name.
Then create a fi object using the numerictype as the second input argument, and the value as the first input argument.
The most general tool to create the numerictype object would be
fixed.extractNumericType
but some alternates are shown below.
See
help fixed.extractNumericType
to learn the many different inputs that can be used to create a numerictype object.
nt = fixed.extractNumericType('sfix27_En29')
val3 = fi( 1/30, nt )
Alternates
nt2 = numerictype('sfix27_En29')
nt3 = fixdt('sfix27_En29')
valMaxFiniteRepresentable = upperbound(nt)
valMinFiniteRepresentable = lowerbound(nt)
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