MathWorks Fixed Point Team

MathWorks

Active since 2017

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The engineering team develop Fixed-Point Designer product at MathWorks. Share best practices to embedded numerical efficiency in Model-Based Design in MATLAB and Simulink.

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What are the efficient ways to generate “mod by constant” code with Embedded Coder (e.g., mod(u, 360))?
If your goal is to generate efficient, inlined code for mod by a known constant, use the Modulo by Constant block rather than th...

23 hours ago | 0

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What are the efficient ways to generate “mod by constant” code with Embedded Coder (e.g., mod(u, 360))?
I’m looking for an efficient way to compute mod by a compile-time constant in Simulink models that generate C/C++ with Embedded ...

23 hours ago | 1 answer | 0

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How does the Compare To Constant block in Simulink choose type of the Constant value, and what are the implications for fixed-point operations?
The Compare To Constant block in Simulink casts the Constant value parameter to the input signal's data type before performing t...

6 days ago | 1

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Question

How does the Compare To Constant block in Simulink choose type of the Constant value, and what are the implications for fixed-point operations?
How can I detect and address questionable fixed-point operations in Compare To Constant block? This example model generates co...

6 days ago | 1 answer | 0

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Answered
Avoid autoscaling of wordlength and fractionlength in fixed point objects
SQRT function computes the square root of a fi object using a bisection algorithm. You can use additional numerictype to contro...

1 month ago | 0

Answered
How can I use bit operation functions like bitconcat with both fi and built-in integer types without branching on isfi?
Use castIntToFi to handle both fi and integer types. If you want your code to work with both built-in integer types and fi obje...

1 month ago | 0

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Question

How can I use bit operation functions like bitconcat with both fi and built-in integer types without branching on isfi?
I'm working with bit operation functions (e.g., bitconcat) that only accept fi objects as input. My code sometimes deals with bu...

1 month ago | 1 answer | 0

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How do I debug "Saturate on overflow detected" warnings from Simulink blocks?
This warning (can be reported as error) indicates that the output signal from this block has exceeded the representable range of...

1 month ago | 0

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How do I debug "Saturate on overflow detected" warnings from Simulink blocks?
I noticed the warning messages like this after running the simulation: Saturate on overflow detected. This originated from 'mod...

1 month ago | 1 answer | 0

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Why do the values of learnables in a quantized dlnetwork still stored as float32(single precision)?
Yes, the learnables on the dlnetwork/quantized network are still stored as single precision. Consider estimating parameter mem...

2 months ago | 0

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Question

Why do the values of learnables in a quantized dlnetwork still stored as float32(single precision)?
Even though the dlquantizer is quantizing the weights of the fully connected layer to int8 and bias of the layer to int32, why d...

2 months ago | 1 answer | 0

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Why did my single precision model generate double data type sine functions, using sin(real_T) instead of sinf(real32_T)?
You can try to run Single Precision Converter, https://www.mathworks.com/help/fixedpoint/ug/getting-started-with-the-double-to-s...

2 months ago | 1

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Question

Why did my single precision model generate double data type sine functions, using sin(real_T) instead of sinf(real32_T)?
I am trying to generate code for TI target. My model has sine block for single data type signals. I found generated code have co...

2 months ago | 1 answer | 0

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FAQ: Why does Fixed-Point fi variable times MATLAB floating-point variable error out in code generation, MATLAB Function Block, etc.?
FAQ: Why does Fixed-Point fi variable multiplied by a MATLAB floating-point variable error out in code generation, MATLAB Functi...

1 year ago | 1 answer | 0

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FAQ: What's the difference between the two Simulink Precision Loss Diagnostics for Parameters and Fixed-Point Constants?
What is the difference between the Detect precision loss that applies to fixed-point constants and the Detect precision loss for...

2 years ago | 1 answer | 0

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Question

FAQ: How can I resolve the error due to lookup table not allowing repeated breakpoints?
I'm trying to model abrupt discontinuities using lookup tables. For example, consider this data that has abrupt discontinuities...

2 years ago | 1 answer | 0

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FAQ: Why does a value look more precise when displayed in MATLAB or Simulink than in the generated code?
A value used in my design looks more precise when displayed in MATLAB or Simulink. The same value in C or C++ generated by Embe...

2 years ago | 1 answer | 0

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Answered
FAQ: Why is a fixed-point type's Fraction Length or Integer Length sometimes negative?
Maximizing precision for limited bits The ability to have a negative fraction lengths or a negative integer lengths is a very g...

3 years ago | 0

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Question

FAQ: Why is a fixed-point type's Fraction Length or Integer Length sometimes negative?
Sometimes fixed-point variables have fraction lengths that are negative. a = 5.6632765314184e+15 aFi = fi(a,1,4) curFractionL...

3 years ago | 1 answer | 0

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Question

Why does fi signed plus unsigned produce needless range bits?
When adding signed and unsigned fi variables with the default full-precision settings, sometimes the output type has needless ra...

3 years ago | 1 answer | 0

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How can I use int64 and uint64 with my Simulink S-function?
How can I use int64 and uint64 with my Simulink S-function?

3 years ago | 1 answer | 0

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Question

Why does Simulink's Weighted Sample Time block sometimes use fixed-point data types for its output?
In Simulink, I want to get the sample time of a signal and use that value in other calculations. The Weighted Sample Time block ...

3 years ago | 1 answer | 0

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How can I use fractional data types when the values are beyond the interval [-1, +1) ?
Many references describe implementing fixed-point designs using fractional data types. These signed fractional data types repres...

4 years ago | 1 answer | 0

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FAQ: Why aren't boolean and 1 bit unsigned integers treated as the same data type?
Variables and signals of the boolean data type (called logical in MATLAB) only represent the values 0 and 1. Variables and sign...

5 years ago | 1 answer | 0

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Best practices for converting MATLAB code to fixed point
I have tried to use fixed-point data types (i.e. fi) for MATLAB code. Are there any best practices for this process?

5 years ago | 1 answer | 0

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Some forms of Simulink logging write 64 bit integers as fi objects. Does that mean I need a Fixed-Point Designer license?
I've observed that some forms of logging in Simulink write integer variables out to MATLAB as fi objects. For example, DSP Bina...

5 years ago | 1 answer | 0

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Answered
How can I use custom constraints for fxpopt?
fxpopt workflow allows user to automatically assign fixed-point data types on a system by trying a basic trial and error loop. ...

5 years ago | 0

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Question

How can I use custom constraints for fxpopt?
I am trying to use fxpopt with custom constraints and I cannot figure out how to do it. I am trying to have optimization be base...

5 years ago | 1 answer | 0

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Answered
Why is matlab fixed pint arithmetic so slow?
Hi, There are two aspects to speed that you may be concerned about. The first is the speed of generated code running on your e...

5 years ago | 0

Answered
fixed point to the power 0 changes word length
fi's element-wise power a.^b https://www.mathworks.com/help/fixedpoint/ref/embedded.fi.power.html is not designed to give t...

5 years ago | 0