Andy Bartlett
MathWorks
Andy leads the Fixed-Point Designer development team.
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Content Feed
Simulink model: Invalid data type for root level port
I suspect your inport "REEC" is not explicitly specifying its data type and is inheriting data type single via Simulink underspe...
12 days ago | 1
| accepted
How to get Tabledata and break point values using command line for look up table
First, get an array of block paths by searching on 'BlockType', 'Lookup_n-D'. Second, iterate over each block in that list to e...
24 days ago | 0
How do I input a tranfer function in simulink with just a numerator?
The Laplace operator s represents a derivative and its inverse (1/s) represents an integrator. In concept, you could model 3*s ...
25 days ago | 0
Make matlab use single as standard for code generation
Embedded Coder is designed to keep the generated code consistent with a Simulink model's simulation behavior. Changing doubles t...
1 month ago | 0
What is the real value of "single(my_variable)"?
Decimal text rounds to nearest representable value When decimal text is read in and parsed by MATLAB, a C compiler, your own cu...
3 months ago | 0
| accepted
Simulink block to get the specified value
You need your design to remember the past value of a signal, so your design will need some lasting memory. Lasting memory is als...
3 months ago | 0
How to set an input/output data type based block mask parameters?
One way to achieve this is to use the Mask Initialization code to create a dummy "value holder variable" of the same type specif...
3 months ago | 1
| accepted
Simulation for custom multiprocessor hardware
Yes, a strength of Simulink is allowing all manner of different things to be brought together in a system level simulation. Thi...
3 months ago | 0
| accepted
Use variable with number of bits for entiere and fractional part
Hi Mathieu, As Walter mentioned, Fixed-Point Designer provides fixed-point support for MATLAB, Simulink, Stateflow, Embedded Co...
4 months ago | 3
| accepted
Why does C code generated from Stateflow logic with 'duration' operator have conversion to real_T (double) in it?
Tunable Pararmeters with Duration appears to be a Limitation for Singles only designs In the model above, tuneParam1, tunePar...
4 months ago | 1
Mux signals do not affect simulation or code generation. But when Code is generated using Mux Block then Arrays are getting generated. Please explain
The mux block is not changing the values. In that sense, "Mux signals do not affect simulation or code generation." But, as the...
4 months ago | 0
| accepted
Stateflow model file dependencies issue.
Hi 1) You can proceed with the rest of the Fixed-Point Tool conversion workflow. A restore point only impacts how you can aba...
4 months ago | 0
Machine precision in simulink
To determine what is happening, a good approach is to log the key signals involved. Then use MATLAB to investigate the logged v...
5 months ago | 0
| accepted
Why is type conversion int32_t to uint32_t a Sign Change Integer Conversion Overflow Defect in Polyspace?
First, two suggestions Here are two suggestions that can improve the efficiency of your generated code and may make the analysi...
5 months ago | 0
| accepted
Matlab Code for IQ Samples Compression and Decompression based on Block Floating point
I'll describe some concepts that will hopefully help you figure out the code needed for your specific case. I'm assuming the in...
5 months ago | 1
What is the equivalent of Discrete Filter bloc in a matlab code ?
dsp.IIRFilter dsp.FIRFilter filter
5 months ago | 1
| accepted
Why do the data become zero when using the function fi?
It's just like scientific notation is the short answer to "Why FractionLength can be bigger than WordLength?". The long answe...
5 months ago | 0
How can you get a mathmatical function from a simulink plot?
Finding a model or function is a very broad field. Depending on the nature of the problem and requirements, many tools and tech...
6 months ago | 0
Simulink Fixed point to Floating Conversion
Notice the "(SI)" shown on the icons of the data type conversion blocks. That means the block is using the less common "Stored ...
6 months ago | 0
| accepted
Does anyone have any experience or success using the manually written fixed-point fft provided by Mathworks in this example?
The FFT provided by DSP System Toolbox as MATLAB callable system object dsp.FFT or as the FFT block should be consistent with ea...
6 months ago | 0
Why can't an fft function output an int data type?
MATLAB's built-in types are generally designed to favor operations producing an output of the same type as the inputs. (Key exc...
6 months ago | 1
Why can't complex integer arithmetic be done?
The integers provided in base MATLAB were design to support image processing use cases. Integer types are also a special case o...
6 months ago | 1
Is there a fixed-point alternative to the fft and ifft fiunction?
The FFT provided by DSP System Toolbox as MATLAB callable system object dsp.FFT or as the FFT block support fixed-point data typ...
6 months ago | 1
reduce the working precision
I'm guessing you want your simulation code to be smaller and faster. Single precision floating-point provides around 7 decimal ...
6 months ago | 0
How to fix error in port widths or dimentions on the reshape block input?
The purpose of Simulink's Reshape block and MATLAB's reshape command is only to "reinterpret" the dimensions (aka size) of the s...
7 months ago | 0
| accepted
Counter for Sawtooth signal in Simulink
The icon shows the Z-domain description of the Integrator block in accumulator mode (noting that K = 1) Y(z) = ( z / (...
7 months ago | 0
How can I use fractional data types when the values are beyond the interval [-1, +1) ?
I recommend against trying to force a design to use fractional types. Using general fixed-point scaling instead of limiting only...
7 months ago | 0
| accepted
simulink fixed point advisor example file
The model used in Harhita's Webinar is attached along with a script to define an input object to trigger both of the model's sim...
7 months ago | 0
Counter for Sawtooth signal in Simulink
Look at the edge detection blocks and the discrete integrator in accumulator mode. You can also look under the mask of the edge...
7 months ago | 0
How can I make my simulation stop when my graph hits 0? (Simulink)
You can build a solution using the Stop Block. You'll need to build the logic that feeds the Stop Block input using relational...
7 months ago | 0
