I am having a model in simulink consisting of two parts one of image processing and other of control systems. I want to introduce delay(waiting loop) between the two independent models i.e when image processing part and controller part is simulated once I want to introduce some delay before the second simulation.How can I do this? any help???
you can put between them a Delay block z^-1 specifiing the delay or create a stateflow block with your logic and delays.
note: there are olso a delay for continus function, see what fit best for you
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I'm simulating a train system and want to measure the time a passenger spends from entering the system to boarding. Entering the system happens on a higher, boarding on a lower level of the model. The problem is that the TimeMeasureEnd block doesn't see the TimeMeasureStart blocks on a different level. Does anyone have experience with this problem or an idea for a solution?
Edit:
I call set_startObjects(TimeMeasureStart[]) in an event occuring once at the creation of the agent in the lower level and set either the start blocks of the one or the other parent, depending on what the parent is. The data is being collected in all child agents separately and displayed in separate histograms in each child agent. How can I accumulate all of them in one single histogram to display in main which is two layers above the child agent where the data is being collected?
you can always define the 'TimeMeasureStart' block dynamically in your 'TimeMeasureEnd' block. Just switch the entry mode for defining it to "static value" as below:
Now you can call on any 'TimeMeasureStart' object anywhere in the model, similar to below where it sits in 'Main':
For Matlab simulink, how does one go about generating multiple step function at different conditions for a system
I am trying to simulate a simple flow through a tank and controlling the temperature within. At various interval say time at 10ses and 20secs i intend to draw out different flowrate/flow amount of water.
With the system designed, how do I show on a single scope how Flow in changes with the different amount of flow out drawn.
Appreciate any kind advises
There are many different ways of doing this, for example defining the data in MATLAB and using a From Workspace block or using multiple Step blocks summed together appropriately. But to start I'd suggest you look at the Signal Builder block.
To view multiple signals at once in the same Scope, either set the scope up to have multiple inports, or Mux the signals together and feed them in in the usual way.
I have a system with some embedded Matlab blocks where I'd like to perform some actions after a certain amount of time, in this case turn on lights and switches in an interface to which I send signals from Simulink.
The problem is that I thought I'd use "tic"-"toc" and "while" in a Matlab function block to perform these actions, say one parameter becoming 1 after 5 seconds, the following parameter becoming 1 after 12 seconds and so on, but I noticed that tic-toc apparently doesn't work in Simulink for embedded functions.
Is there any similar functions that could be used in Simulink for embedded functions or is there any other way to do this?
Edit: I've tried to get the clock's time as well, but it's a growing value. Is there any way to "lock" the time as a parameter when the block's function is executed?
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 using a Unit Delay and Summation block.
If you need to be able to enable and/or reset the counter then use the appropriate block from the Additional Discrete library.
I have a matlab function block (which is not relevant) whose input is his previous output (loop). For example, if in a sample period the output is X, his input in the next sample period will be X, and so on.
This image shows a simplification of my simulation. I initialize the input of my function for the first loop.
The problem is that matlab functions recieves an event based signal from de initialization block in the first sample period (zero-duration), which I must convert to a timed based signal (so I can apply the unit delay that avoids an inifite loop, and allows to generate the next input as explained before). So, when I do so, I lose the information contained in the event-based signal (due to the zero-duration values) and the loop does not work.
If there was a way to intialize the loop in the time-based domain (green part of the image) so, in the first sample time, it is not a zero-duration signal, it would avoid the problem.
Is there any way to do so? Or, a different approach for this problem?
Two approaches come to mind
The initial condition can be set in the Unit Delay block, so it's not clear from your simplified example why you need the specific Initialization block.
You could just use a persistent variable inside the MATLAB Function block to maintain the state from one execution of the block to the next (noting that since it is event driven the block may not get called at every time step, only at each event triggger).
I am implementing some head tracking and I get 2 matrices of horizontal velocities. (A vector field decomposed into vertical and horizontal velocities). For each of these matrices I do some math to calculate the actual head tracking.
My question is, is there a way to do that math (which is a set of blocks) on both matrices without copying the math blocks onto each signal?
It's hard to explain so here's a screen shot of my model:
You can see that the "complex to real-imag" block has 2 outputs (this is the little one in the middle). The mean block and the integrator circuit then calculate the head velocity and position for the real matrix (horizontal position). I want to do exactly the same routine on the imaginary matrix (vertical direction). Obviously I can just copy the blocks, but surely there must be a better way of doing it? In a way I'm looking for an analogue of a loop in "normal programming" like C or something, where a block of code is executed several times on different inputs.
You can create a Library in Simulink that contains code you can reference multiple times.
Go to File -> New -> Library. In the model window that opens, you can create any number of subsystems with whatever code you want. Then, just drag a subsystem from the library into your model. The subsystem will now appear in your model with a little arrow icon in the lower left. This indicates that the subsystem in the model is a link. You can drag as many instances of the library subsystem into your model as you wish, just as you can call a function as many times as you wish in any other programming language.
If you right-click on the subsystem in your model, you can select "Link Options -> Go To Library Block" to get back to the library. You can make changes in your model and propogate them back to the library as well.
One way to easily reuse a set of blocks is to create a subsystem out of them. In your case, you can create a subsystem by grouping existing blocks, then simply copy and paste your subsystem to use it for your imaginary output.
Although potentially more complicated, you could also look into using mux signals to avoid having to copy parts of your model.