matlab,random,simulink,matlab-coder

The rand being called from your MATLAB Fcn Block is not the same rand as would be called from MATLAB, hence the reason why rng('shuffle'); has no effect on Simulink's random number generation. You could force the MATLAB Fcn Block to use MATLAB's rand function by doing the equivalent to,...

matlab,variables,simulink,s-function

For a parameter to be tunable it must be passed as an input from Simulink to your S-Function. This is done by specifying them in the Parameters part of the S-Function block's dialog (as a comma separated list), and using the ssSetNumSFcnParams method within the S-Function itself to tell the...

Here's what I would do: add the following pseudo-code to the block callback StartFcn: T_PWM = get_param(gcb,...); % get the block parameter (period) of the current PWM block (string) T_PWM = str2double(T_PWM); T_solver = get_param(bdroot,'FixedStep'); % get fixed used by the solver (string) T_solver = str2double(T_solver); % convert from string...

There's nothing wrong. SVD decomposition of a matrix is in general not unique. If you perform U*E*V' you'll get the same value of A in both cases....

You can do it from the Simulink editor window by going to File -> Export model to -> Previous version and selecting the version of the model you need....

Take a look at ssSetInputPortDataType. Needs to be called in the S-Function mdlInitializeSizes function. In your case you'll need something like: ssSetInputPortDataType(S, 0, SS_BOOLEAN); Assuming the input port is the first one and you're not concerned about the return value. The function for the outputs is ssSetOutputPortDataType, with identical use....

Assuming that you are talking about using the matrix as if it's a buffer, then if you have the DSP Blockset you can use the Buffer block. Otherwise this is pretty straight forward to do using a MATLAB function block (see code below). If the matrix is constructed by another...

If you have DSP System toolbox, there is a "Cumulative Sum" block which should be able to replace your toeplitz, traiangular matrix and matrix sum. http://www.mathworks.com/help/dsp/ref/cumulativesum.html If you do not have DSP System toolbox, I suggest coding this in MATLAB Function block where it should be a one liner. y...

I would re-arrange your equations in state-space form and use the State-Space block, which is better suited for matrix equations. Another option is to use basic Simulink blocks, such as Integrator and Gain blocks, with vectorized inputs. I am not 100% sure this will work, but reasonably confident....

The comment from @am304 gave me a start point. One has to use SimOut = sim(my_model); x=SimOut.get('VariableName') and problem solved...

matlab,loops,struct,simulink,matlab-coder

When generating code using MATLAB Coder or Simulink Coder, not only are cell arrays disallowed, but also referencing fields of a structure using dynamic names. Since you can't use dynamic names, you should probably just repeat the content of your loop body multiple times, once for each field name, which...

events,simulink,exponential-distribution

You've got a couple of choices. In MATLAB, you can generate all samples in advance (i.e. before running the simulation) and use them to create a suitable signal, then use that as an input into the model (using the From Workspace block). Or, if you need to do the sampling...

You should be able to use properties s = 100; d = zeros(1,100); end right? If you already have the 100 as a default for s, you should also be able to provide this as part of the default for d. I'm guessing that you're trying to avoid doing that...

Use a MATLAB Function Block. Have your array input to it as a Parameter, which means it'll pick the whole array up from the MATLAB Workspace during model initialization. Depending on how you want to index into the matrix -- you haven't given enough information to determine this -- you...

You should set your source (From Workspace) to output one sample per time instant. Currently I think all of your data is going out at the same instant. Your simin in "From workspace" should be similar to the following struct for your case. simin.time = 0:20; simin.signals.values = (0:5:100)'; simin.signals.dimensions...

Some points/suggestions: It seems that you parameterise your Simulink model with K2a (unless I can't see very well from the screenshot), but it's not defined anywhere. You define k2a in your code, but MATLAB is case-sensitive so it's not the same as as K2a. Your Fcn1 block doesn't do anything,...

It should work. Consider for example a Simulink model with a constant block, a MATLAB Function and a Scope block. Try the following: add_line('untitled','Constant/1','MATLAB Function/1') add_line('untitled','MATLAB Function/1','Scope/1') ...

It depends what sort of integration you are after: If you just want to load some data from the database, run your Simulink model using that data, and then maybe write some data back onto the database once the simulation is finished, you don't need to the MATLAB Function block...

The answer to this was to create a new mask on the target block to be redrawn and add a variable in the parameter tab. I called my variable 'onSettingsChanged' to be an event handler, set it as Type: edit, Evaluate: off, Tunable: on. In the event source mask under...

You can use an user-defined function as a filter, pick the filter transfer function, translate it into a difference equation (the discrete-time equivalant to the diferrential equation), implement that difference equation in a function and feed the sampling rate as an input (the sampling rate will appear as a constant...

matlab,cell,simulink,cell-array,matlab-coder

Please read through the MATLAB Code Generation Manual. There, in the General Limitations section, it clearly states that You cannot use cell arrays in your code. The solution to this is presented in the MATLAB Central: You have to replace the cell arrays by e.g. structs. As I see from...

matlab,filtering,signal-processing,simulink

Basically you are asking for a filter that has time varying parameters. The Butterworth filter block does not allow for this, and cannot be modified to do so, so you are going to have to roll your own. This can be achieved in several ways: Determining the difference equations that...

This is one general way to do it, explained used the in-built example vdp: simulink; name = 'vdp'; %// open system, pause just for displaying purposes open_system(name); % pause(3) %// find system, specify blocks to keep allblocks = find_system(name); ToKeep = {'Out1';'Out2'}; %// add systemname to strings ToKeep = strcat(repmat({[name...

For the parameters to be available to the other blocks, they need to be either in the model workspace or in the base workspace. You could add an initialise callback to your block that would copy the mask parameters to either workspace, but in my opinion, a much better practice...

As far as I know, For code generation, the first appearance of a variable must establish its size. The first appearance of a variable cannot be subscripted. So you really need to use zeros. But there is not the problem! You can get your values of y in a different...

For a simple implementation of limits, the saturation block, as in am304s answer is alright. But you should know what you do. Saturating PID controllers can cause an integral wind-up which should be considered (without having a deeper look into your model, whether it could actually happen). To be on...

image-processing,computer-vision,simulink,matlab-cvst

Well Peter Corke provides a handy pair of Matlab/Simulink toolboxes for Robotic Control and Machine Vision. It might not be exactly what you need, but I have found them extremely useful.

You are searching for two different features of simulink: Library Mathworks-Documentation: Working with linked blocks To edit a block "somewhere" you have to disable the link, make your changes and resolve the link again. After updating you model (ctrl+d) or updating the links (ctrl+k) the updated lib content is in...

matlab,global-variables,simulink

Erm.. Unless there is a specific reason why you need it in this form, I would strongly recommend replacing your MATLAB Function block with Simulink blocks such as: Gain blocks for Kp, KI, and KD Sum blocks for all addition and subtraction Derivative block for derivative Integrator block for integration...

Using a persistent variable is the correct way to go, but as you found out, you cannot use varargin in a MATLAB Function block. The trick is to check whether the variable is empty or not, as in: function y = fcn(x,d,yp) persistent yp if isempty(yp) yp=0; %only if yp...

See the Documentation about how the sampling rate works for subsystems, also take a look at this.

The function you are implementing is y(t) = Integrate_{x=0->t} u(x) dx - Integrate_{y=0->t-T} u(y) dy (1) where T is the transport delay. This can be reordered by substituting z = y + T and due to the linearity of the integral to y(t) = Integrate_{x=0->t} u(x) dx - Integrate_{z=T->t} u(z...

In the Model toolbar select Simulation->Model configuration parameters. You have not setted the Code replacement library (CRL) in the Code Generation->Interface pane. Set it to C89/C90, C99, etc. PS: If you want to use the code generation you must set a Fixed-step solver (with its Step time) in the Solver...

simulink,simscape,simpowersystems

I assume you are referring to Simscape/SimPowerSystems. The answer is yes, use the Controlled Voltage Source block from the Electrical Sources library of Simscape or the equivalent Controlled Voltage Source block from the Electrical Sources library of SimPowerSystems (if you use the old generation library of SimPowerSystems, the new one...

Are you sure that you're writing a level-1 S-Function? If you are, then you shouldn't. These days both m-code and c-code S-Functions should all be written as level-2. You haven't specifically indicated whether you are writing in m-code or c-code, but since you've mentioned mexCallMATLAB it's assumed that you are...

The Variant Manager was introduced in R2013b, see the release notes (under R2013b, Component-Based Modeling).

Now an answer for Simulink, this basically implements the same as M=magic(5);M(:,2)=1:5 ...

matlab,code-generation,simulink

I think this is what you're looking for : set_param(yourModelName, 'CheckMdlBeforeBuild', 'OFF'); ...

matlab,integration,simulink,ode,differential-equations

Short answer: yes it's possible, but nobody's going to do it for you. The steps would be: Write down on paper the differential equation of the system Put it in a form dy/dt = f(t,y) and write it as a MATLAB function Solve the differential equation with one of the...

c++,matlab,arduino,simulink,matlab-coder

Is the header file containing the declaration of dout_output being included in the C code generated from the MATLAB Function code? If not, you'll likely see compiler warnings that say something about implicit int return type. When C compilers don't have a declaration for a function, they may assume that...

As I mentioned in the comments, if you are using a fixed-step solver, then the step size is, well... fixed for the duration of the simulation. So you (or the user) needs to set it appropriately before starting the simulation to make sure all effects are captured. There is no...

Simulink (and MATLAB) run on Windows, Linux, OSX, etc... which are not real-time operating systems. Therefore MATLAB code or Simulink models will never run in real-time. The only way to ensure hard real-time execution of a Simulink model is to generate C code from it with Simulink Coder and Embedded...

matlab,compatibility,simulink,backwards-compatibility,stateflow

This is a common problem. This page talks of the same problem - claiming that there is no good solution... It does however come with a smart way of searching through the release notes: Click on the bottommost unexpanded release, to expand the it. Click on "expand all" all link...

Yes, that's what libraries are for. You need to create your own library, then any change that you make to the block in the library will be propagated to all models using that block, provided that the library blocks are not disabled/broken. For more details, see Create Block Libraries in...

I think you're asking for Simulink.findvars.

c,matlab,simulink,matlab-coder

Getting the Code to Compile To get the code to compile I added: #include "mystruct.h" in the Simulation Target->Custom Code->Header File section. Adding the required include paths on that pane may be necessary as well. Compatibility Concerns After doing the above, the code crashes when running. The issue is that...

In external mode, data logging is effected by the Duration setting on the External Signal and Triggering panel of the External Mode Control Panel. Go to that panel and press the Help button for a description of Duration and how to change it

matlab,function,graphics,simulink,handle

You can try to remove the gobject initialisation and use double() to wrap your call to any matlab graphic object. Ex: hVector(i) = double( quiver(startInc(1,:),startInc(2,:),endInc(1,:),endInc(2,:)) ) ; I suggest reading Loren's article about the compatibility issues which can arise when switching to HG2 versions of Matlab. A quick quote from...

c,matlab,simulink,matlab-coder

The library format should match the architecture on which you are going to compile the generated code. So .a or .so for GNU/Linux, .lib for Windows (you usually link against the .lib file not the .dll), and usually .dylib on Mac. You can also link in object files, (i.e. .o,...

This depends on the actual simulation model. Before the simulation starts, Simulink analyzes the model (which blocks are connected in which direction, are there algebraic loops, etc.). The result is the so-called sorted order of the blocks, which is then used to actually execute the blocks' code. See the documentation...

matlab,data,struct,simulink,mat

Use the From Workspace block, but make sure to arrange your data so that the first column is the time data points and the second column the actual data. If you tick "Interpolate data", Simulink will interpolate your data for the time steps that are not in your original data....

matlab,parallel-processing,simulink,parfor

I think you need to load the model on the worker (see sim in parfor with Normal Mode in the documentation for more details), so your load_system needs to be within the parfor loop: tic parfor w=1:10 load_system('mymodel'); warning('off', 'Simulink:Engine:UsingDefaultMaxStepSize'); w_str=num2str(w); set_param('mymodel/mysystem','sys', ['tf(',w_str,',[1 ',w_str,'])'] ) sim('mymodel',[],[]) drawnow end toc ...

c#,visual-studio,charts,simulink

To import Matlab files, check out: https://www.nuget.org/packages/MathNet.Numerics.Data.Matlab/3.0.0-alpha9 To plot the data, you've got lots of options. Free from Microsoft: http://archive.msdn.microsoft.com/mschart (for Windows Forms) A good summary of other charting options (for WPF): Recommendations for a Fast WPF Charting Control...

matlab,matrix,simulink,robotics,matlab-coder

You can't have the last dimension as 1 because MATLAB treats any matrix of dimension [m,n,1] as [m,n]. See size() returns 1 where matrix dimension should not exist for more details. Try defining R of size [n_robots,3,3] and then re-arrange the matrix inside your code (I assume you are using...

I am supposing you have some fs somewhere in your code, that you are sampling something. What Simulink tells you is: if you use fixed step size, please, use a integer multiple of that fs. This makes sense, as if your fs is 1Hz, and you do a simulation step...

matlab,graphics,simulink,matlab-figure,figure

You can use rand(N,1) to get an N element column vector where each element is a random number between 0 and 1. Set N to be how ever many values are indicated by your "......." at the end of the post. As each cycle "(1 second)" increases an integer counter...

I think the problem is that in each of your iterations, you are not re-calculating J2 and Jeq. Now, your model is parameterised with J1, J2 and Jz so these are the values you need to update with each iteration. Something like: a2 = 0:J1; % do you really want...

Put the controller inside a Triggered Subsystem and set the trigger signal to go high after 20s, for example using a Clock block and a Compare to Constant block, set to >=20.

matlab,function,code-generation,simulink

You should probably replace that line: elseif in_Motor<0 with a simple else....

Open the Model Explorer (View -> Model Explorer or Ctrl-H) and select Model Workspace underneath you 'abc' model. Change the Data Source from 'MAT-file' to 'Model file'. Check this doc page for more information on the Model Workspace web(fullfile(docroot, 'simulink/ug/using-model-workspaces.html')) ...

When exported to the MATLAB Workspace, your controller should be an LTI Object. Open the Simulink Library Browser, find the Control Toolbox library, and drag the LTI System block into your model. Then insert the name of your Workspace variable into the block....

See the examples at Model Workspaces, and particularly Use MATLAB Commands to Change Workspace Data.

The only way to do this is to write each of your blocks as S-Functions. If you are using m-code then within the setup method you'll need to define the block sample time as block.SampleTimes = [-2 0]; then within the output method you'll need to set the next sample...

Your screenshot shows your constant block to have a sample time of Inf. As the error message suggest, you need to change that to a discrete sample time. In addition, you should also: check your model is using a fixed-step solver check what time step you are using for your...

Not sure about the C code approach, but you could generate an executable using the RSIM target. This is relatively easy to implement and should speed up the execution. See Deployment of Simulink Models and Using RSim Target for Batch Simulations for more details.

matlab,simulink,solver,ode,differential-equations

Can you solve it in closed form? Looks doable to me. I advise anyone to have the answer in hand if possible before you start a numerical solution. Here's what I get. Check me: y(x) = e^(-x)*(8e^3x + 3e^4x + 1)/12 Wolfram Alpha says this is correct. (Note: Trouble for...

matlab,simulink,mex,s-function

Problem solved now, see edited first post.

Once the block is added, change its Orientation property, e.g. set_param('NameOfBlock','Orientation','up'); ...

matlab,time,simulink,matlab-coder

You shouldn't be using absolute time in an embedded system, which is at least one of the reasons why tic-toc and clock from MATLAB don't work with Simulink Coder. You should create your own counter, which you start and stop when you need to. This is pretty easy to do...

The most likely problem is that your data set doesn't contain a rich enough set of frequencies for the underlying algorithm to estimate a model (of any order). The iddata1 sample data set gives an example of what typical data should look like. In particular, note that the input signal...

matlab,simulink,circuit,simscape

If you're allowed and have access to it, the easiest way would be to use Simscape, which has an electrical library. See Simulink Simscape simple circuit not working for a similar question.

Short version This is definitely possible! You can use the callback-function StartFcn in the model properties (or in the block itself). This function is being executed each time the model is being simulated. Then add a check for the solver-type that throws an error if it is set to Fixed-step....

Yes, it's possible. Double-click the model block and select "Normal" for Simulation Mode: More details in the documentation....

matlab,simulink,simscape,simpowersystems

Matlab version: R2012a I find the Series RLC Branch block used under Simscape -> SimPowerSystems -> Elements, and the DC Voltage Source block used under Simscape -> Foundation Library -> Electrical Sources. The 2 nodes are both white rectangles. And there is another DC Voltage Source block under Simscape ->...

The main idea is to create Bus of type you need. I did it this way: num = zeros(15,15,15); move = zeros(15,15,15); a = struct('number',num,'movement', move); busInfo = Simulink.Bus.createObject(a); You can see it's possible to create any data structure, array, vector anything you want and then create Bus Signal of...

This is a Toolbox issue: As you can see from the documentation (which is already linked in the question), the 'Create 3x3 Matrix' block is from the Aerospace Blockset Toolbox. Judging from the screenshot it appears that you don't have this toolbox in your R2014b installation. One possible workaround would...

matlab,simulink,modeling,transfer-function

If you've already done the Laplace transform and calculated the transfer function in s-domain, I think it means applying the transfer function to an arbitrary transient input and calculating the response. The transfer function is based on the response due to a unit step function. If you have an input...

linmod only works for Simulink models, not subsystems. The input and output points for the linearization are those corresponding to Inports and Outports blocks at the top-level of the model. If you have Simulink Control Design, you should use linearize, which is much more flexible and powerful (or the equivalent...

This looks like pretty straightforward to solve with the ode solvers, without the need for event. I would define a function such as: function dX = my_ode(t,X) for k=1:length(X) if abs(X(k)-1) <= 1e-6 % or use whatever tolerance you want, e.g. eps dX(k) = 0; else dX(k) = X(k); end...

matlab,visual-studio-2012,simulink,mex

This is a known bug (I'm guessing). See the workaround on the MathWorks website: http://www.mathworks.co.uk/support/bugreports/931218...

matlab,matrix,simulink,s-function

You'll need to specify the dimensions of the signal, see the documentation I've done a simple test, simulate for 10 seconds and it all looks good. simin.time = 0; simin.signals.values = ones(4) simin.signals.dimensions = [4,4]; ...

matlab,compiler-errors,simulink

From the documentation at http://www.mathworks.com/help/coder/ug/functions-supported-for-code-generation--categorical-list.html#bq1h2z8-25 for roots function in MATLAB coder, the output of roots is always variable size and complex. That explains the error and the output from your examples. You might want to change your condition from isreal to a comparison against 0 for the complex part while...