Answered

Unit Delay block is supposed to be NOT a DIRECT FEEDTHROUGH But in documentation it is said YES

The Delay Block and the Unit Delay Block are subtly complicated especially with regard to Direct Feedthrough. Whether or not Di...

Unit Delay block is supposed to be NOT a DIRECT FEEDTHROUGH But in documentation it is said YES

The Delay Block and the Unit Delay Block are subtly complicated especially with regard to Direct Feedthrough. Whether or not Di...

1 year ago | 1

| accepted

Answered

How to remain the bits of input signal port unchanged after using fixed-point tool?

LockScale prevents changes by Fixed-Point Tool Often some signals and parameters in a model are mandated early in the design pr...

How to remain the bits of input signal port unchanged after using fixed-point tool?

LockScale prevents changes by Fixed-Point Tool Often some signals and parameters in a model are mandated early in the design pr...

1 year ago | 0

| accepted

Answered

Is it possible to disable compiling before simulating in Simulink?

Simulink Fast Restart is exactly what you want (assuming you are not making structural changes to your model between simulations...

Is it possible to disable compiling before simulating in Simulink?

Simulink Fast Restart is exactly what you want (assuming you are not making structural changes to your model between simulations...

1 year ago | 2

| accepted

Answered

Nonlinear plant in simulink

The key is to model Y(k+1) to Y(k) using a unit delay. The output of the unit delay is the input value from one time step earl...

Nonlinear plant in simulink

The key is to model Y(k+1) to Y(k) using a unit delay. The output of the unit delay is the input value from one time step earl...

1 year ago | 0

Answered

Mask parameter value is ignored with HDL Counter word length

Model Reference is not compatible with what you are trying to do. As an alternative, consider creating a Simulink library and pu...

Mask parameter value is ignored with HDL Counter word length

Model Reference is not compatible with what you are trying to do. As an alternative, consider creating a Simulink library and pu...

1 year ago | 1

| accepted

Answered

help required for fixed point conversion

Mapping an A2D to a fixed-point data type One way to map an A2D converter to a fixed-point data type is to use two real-world-v...

help required for fixed point conversion

Mapping an A2D to a fixed-point data type One way to map an A2D converter to a fixed-point data type is to use two real-world-v...

1 year ago | 0

| accepted

Answered

help required for fixed point conversion

The number 395 is how many times that block in the model overflowed during the previous simulation. Suppose the element was a da...

help required for fixed point conversion

The number 395 is how many times that block in the model overflowed during the previous simulation. Suppose the element was a da...

1 year ago | 0

Answered

help required for fixed point conversion

Hi Gary, That portion of your model will involve 4 data types. Digital measurement of output signal from analog plant Set poi...

help required for fixed point conversion

Hi Gary, That portion of your model will involve 4 data types. Digital measurement of output signal from analog plant Set poi...

1 year ago | 0

Answered

Overflows when I use Fixed-Point Tool

Two Kinds of Overflows Fixed-Point Tool presents two types of overflows, Actual and Potential. Actual Overflows Actual overfl...

Overflows when I use Fixed-Point Tool

Two Kinds of Overflows Fixed-Point Tool presents two types of overflows, Actual and Potential. Actual Overflows Actual overfl...

1 year ago | 0

| accepted

Answered

Problem with Simulink.NumericType after AUTOSAR-XML (ARXML) import

To simulate the model with the fixed-point data types and see bit-true behavior will require a Fixed-Point Designer license. Ho...

Problem with Simulink.NumericType after AUTOSAR-XML (ARXML) import

To simulate the model with the fixed-point data types and see bit-true behavior will require a Fixed-Point Designer license. Ho...

1 year ago | 0

Answered

Can we replace parameter value with parameter name while generating C code from model?

Please see the documentation Macro Definitions (#define) - MATLAB & Simulink (mathworks.com)

Can we replace parameter value with parameter name while generating C code from model?

Please see the documentation Macro Definitions (#define) - MATLAB & Simulink (mathworks.com)

1 year ago | 0

Answered

Am I missing something, or is the Tip wrong?

Hi, The advise is generally correct. Turning off Integer Saturation and allowing the math to wrap modulo 2^N will lead to lea...

Am I missing something, or is the Tip wrong?

Hi, The advise is generally correct. Turning off Integer Saturation and allowing the math to wrap modulo 2^N will lead to lea...

1 year ago | 1

| accepted

Answered

Why is my Simulink data type randomly changing?

Yes, this is most likely due to attribute propagation. You likely have an underspecified "chicken and egg loop" in your model. T...

Why is my Simulink data type randomly changing?

Yes, this is most likely due to attribute propagation. You likely have an underspecified "chicken and egg loop" in your model. T...

1 year ago | 1

| accepted

Answered

What is the efficient code?

Simple Ansewer: Use shift approach unless multiplicative constant is really big In my experience, the multiply by constant foll...

What is the efficient code?

Simple Ansewer: Use shift approach unless multiplicative constant is really big In my experience, the multiply by constant foll...

1 year ago | 0

Answered

Method of Real number multiplication operation

Quick Answer: Shifts are Multiply or Divide by a Power of Two Shift left of M bits is equivalent to multiplication by 2^M wh...

Method of Real number multiplication operation

Quick Answer: Shifts are Multiply or Divide by a Power of Two Shift left of M bits is equivalent to multiplication by 2^M wh...

1 year ago | 0

| accepted

Answered

Trouble using fixed point type conversion in Simulink

Check rounding and overflow handling mode By default, the Data Type Conversion block rounds to Floor and Wraps overflows. In c...

Trouble using fixed point type conversion in Simulink

Check rounding and overflow handling mode By default, the Data Type Conversion block rounds to Floor and Wraps overflows. In c...

1 year ago | 0

| accepted

Answered

What is the "net slope"

Net slope is used in fixed-point operations to achieve agreement of scaling. The slopes of all the variables involved in an oper...

What is the "net slope"

Net slope is used in fixed-point operations to achieve agreement of scaling. The slopes of all the variables involved in an oper...

1 year ago | 0

| accepted

Answered

Simulink model converts floating-point numbers to fixed-point numbers

Suggestion consider using modByConstant Since the "denominator" of your modulos are constants, you my wish to use the modByCons...

Simulink model converts floating-point numbers to fixed-point numbers

Suggestion consider using modByConstant Since the "denominator" of your modulos are constants, you my wish to use the modByCons...

1 year ago | 0

Answered

Simulink model converts floating-point numbers to fixed-point numbers

By default zeros() gives double Your output is double because of how it is initialized with the zeros() function n = 3; m = 4...

Simulink model converts floating-point numbers to fixed-point numbers

By default zeros() gives double Your output is double because of how it is initialized with the zeros() function n = 3; m = 4...

1 year ago | 0

| accepted

Answered

Data type conversion changes the value of the signal

Why cast to single has large quantization error. The cast from fixed-point to single will use single precision for constants an...

Data type conversion changes the value of the signal

Why cast to single has large quantization error. The cast from fixed-point to single will use single precision for constants an...

1 year ago | 0

| accepted

Answered

Data type conversion changes the value of the signal

Brief answer The original value 0.1 is between two representable values (0.099609375 and 0.1005859375) of the type being quanti...

Data type conversion changes the value of the signal

Brief answer The original value 0.1 is between two representable values (0.099609375 and 0.1005859375) of the type being quanti...

1 year ago | 0

Answered

Time delay threshold for constant output

I suggest you start by writing down on paper the equations or pseudo code that you think will solve the requirements of your pro...

Time delay threshold for constant output

I suggest you start by writing down on paper the equations or pseudo code that you think will solve the requirements of your pro...

1 year ago | 0

Answered

Error in Divide Block - System Generator

The System Generator is a Simulink add-on product developed by AMD (Xilinx). The data types mentioned in the error message, Fix...

Error in Divide Block - System Generator

The System Generator is a Simulink add-on product developed by AMD (Xilinx). The data types mentioned in the error message, Fix...

1 year ago | 0

| accepted

Answered

Remainder of a division operation in System Generator

Consider restructuring your design to work in units of revolutions instead of in degrees. In that case you only need to perform ...

Remainder of a division operation in System Generator

Consider restructuring your design to work in units of revolutions instead of in degrees. In that case you only need to perform ...

1 year ago | 0

| accepted

Answered

Simulink Moving Average block not averaging according to the window length specified

Hi Shani, Please create a simplified model that exercises the Moving Average Block in isolation. Create a test input sequence...

Simulink Moving Average block not averaging according to the window length specified

Hi Shani, Please create a simplified model that exercises the Moving Average Block in isolation. Create a test input sequence...

1 year ago | 0

Answered

Floating-Point to Fixed-Point Conversion of IIR Filters

Hi, Examples often depend on supporting files. To successfully run these examples, all the files needed by the example need to ...

Floating-Point to Fixed-Point Conversion of IIR Filters

Hi, Examples often depend on supporting files. To successfully run these examples, all the files needed by the example need to ...

1 year ago | 0

Answered

FAQ: Why does a value look more precise when displayed in MATLAB or Simulink than in the generated code?

Textual Representation is Often an Approximation The textual representation of values displayed in MATLAB and Simulink is ofte...

FAQ: Why does a value look more precise when displayed in MATLAB or Simulink than in the generated code?

Textual Representation is Often an Approximation The textual representation of values displayed in MATLAB and Simulink is ofte...

1 year ago | 1

| accepted

Answered

Which block's fixed format will be optimized firstly in Fixed-Point tool？

Hi Lin, The optimization proceedure used by Fixed-Point Tool Optimization Conversion workflow is not designed to be determinist...

Which block's fixed format will be optimized firstly in Fixed-Point tool？

Hi Lin, The optimization proceedure used by Fixed-Point Tool Optimization Conversion workflow is not designed to be determinist...

1 year ago | 0

| accepted

Answered

Simulink ADD block keeps returning 255

My guess is that Sum block's output data type is uint8, and the block is configured to wrap on integer overflows. So the output...

Simulink ADD block keeps returning 255

My guess is that Sum block's output data type is uint8, and the block is configured to wrap on integer overflows. So the output...

1 year ago | 0

Answered

n-D Lookup Table dimension error

There are two issues. For simplicity, I'll assume the block is configured to do linear interpolation and extrapolation. First,...

n-D Lookup Table dimension error

There are two issues. For simplicity, I'll assume the block is configured to do linear interpolation and extrapolation. First,...

1 year ago | 1

| accepted