I am working in matlab simulink.There are two parts of my work.one is about control systems and the other is about image processing.I want to link them such that the control system part only receives a scalar input from image processing part.So i want to use the 'model' block attached to the image processing part such that there is a scalar input to the model block.How can I use this 'model' block such that it has an input port as I donot see any input port to this block.Please guide me.
The Model Block is used whenever you want to make use of a model inside of another model. This is something that is useful, for example, when multiple people are working on a large system that is comprised of multiple self-contained systems each of which could be its own model, but that could also act together in some useful way.
If you are just using Model Blocks for the sake of organizing subsystems together, then you should consider using Subsystems, instead. Subsystems allow you to group blocks together and do not require you to create separate models for each of your components (i.e. your Controller subsystem and your Image Processing subsystem). You can easily make a Subsystem either by dragging in the Subsystem block from the Simulink Library Browser, or by selecting components in your model, right-clicking, and selecting Create Subsystem from Selection.
However, if you actually do want to use Model Blocks, that can be done as follows. So, I'm assuming that you have already created two models -- one for your control system, the other for your image processing algorithm.
First, in each model, make sure you have specified the proper inputs/outputs. You will do this by adding Inport and Outport blocks to the top-level of each model.
Next, create a new model in which you will integrate the Control model and Image Processing model. Add a Model Block for each model (as you had already described doing). For each Model Block, open the Parameters dialog box. You will see a parameter where you can specify the model name. Enter the name of the model that you will be referencing (i.e. either the controller or image processing model). Additionally, you can browse for these models. Once you do that, the inputs and outputs that you had previously specified should now be visible on the Model Blocks.
Related
I am making two separate SimBiology Models with the same compartments but different species. Transport between the compartments are different for each species. I want to combine the two models so I can add an interaction term between the two species and use the simulations to get concentration profiles of both the species. Is there a function to do that in SimBiology? I have not been able to find one. If not, what would be the best approach to code a function to do so?
The most relevant function is copyobj. You can also use the SimBiology Desktop's graphical interface to copy and paste one model into another. I also have a prototype of a function for combining two models that I would be happy to share. If you're interested in that, please contact me via my MathWorks community profile.
Your best bet would be to write a script based on copyobj function provided by Matlab, if you want to copy programmatically. You need to be little cautious here as this function throws an error, IF the object copied and the target model have name conflicts. For example, if you want to copy a compartment by name 'C1' from a source model to a target model that already contains a compartment by the same name ('C1'), then the program throws an error due to name conflicts. In such a case you have to programmatically rename the source 'C1' compartment before you copy it to the target model. The rename command provided by Matlab might be useful.
Even after overcoming the errors due to name conflicts, there is another problem with the above method --- the layout/diagram of the models will not be preserved. If you want to preserve the model layout (that is the diagram of the model), you can use GUI based simbiology model builder. First you manually select the model/submodel that you want to copy, click 'Ctrl+C' (like you would do for copying a text) and paste (Ctrl+V) it in your target model. The name conflicts will be automatically handled by the matlab. That is the source 'C1' compartment will be automatically renamed by matlab (to probably 'C2'), and pasted in the target model.
You may look at this function, that probably helps you to build your custom model merger programmatically. It is an old function that works with older versions of Matlab, and may not be relevant now. But it may provide some guidance on building your own script.
I have a problem with Simulink, I created Simulink model, and to make it more understandable I want to use In and Out blocks and connect them with scope, but that doesn't work properly. Values don't go through this operation and scope is empty.
Values in whole model are good, on other connected scope everything works fine.
Inport are used to get external data into a model. Outport are used to pass data generated by the model out externally (i.e. back into MATLAB).
If you have an Inport, and you don't set up data to be passed into your model, then the signal attached to the Inport will be zero. It sounds as if this is what you have done.
From your description it sounds as if you are wanting the GoTo and From blocks.
Let's say I have a collaboration diagram that models a process named CheckMessage which is quite complex and spans over few lanes and pools. Now I would like to model another process, e.g. CreateMessage which would make use of the previous process to check first if message doesn't exist already or if all its fields are valid, etc.
The thing is, that both processes make use of the same swimlanes and pools. What is the proper way to model such interactions? I was thinking to model CheckMessage as a sub-process of CreateMessage, however sub-processes can't be attached to pools or lanes - if I understand it correctly they just stay within a lane of activity which invoked them. Can a Call Activity encapsulate such beahviour (cross pools and lanes)? Or can I somehow reference the CheckMessage diagram as a whole?
Thanks in advance.
I could think of the following approaches:
Using Diagram Reference: This is used quite often when you want to switch easily to the more complex part. The disadvantage is that, unlike Fragments in SDs, you do not have ways to really connect flows in and out of referenced diagrams.
Repeating parts of the process: here you just pick those actions from the complex process which ought to interact with the other process. You can highlight that by putting a boundary around these and adding a diagram reference as described above.
Call Activity: This is another valid way. Here you have an activity which you instantiate as action. The advantage here is that you can add pins for input and output parameters.
I guess there is no silver bullet and you have to choose what is appropriate in each case.
Edit Regarding #3 it looks like that:
(this is an example and not to be used in practice)
The Action to the right is an instance of the Activity as you can see by Ctrl-L (show parent).
Short version
I am considering to use BusObjects to implement hard interface control on a (large industrial) application using Simulink and I would like to store the BusObjects (hundrends of them) into a Matlab structure so that the entire application interface specification is well organized. However, it seems that BusObjects cant be contained into structures, nor they can reside on other workspaces other than Matlab Base. Any idea on how to handle this?
Long version
I would like the interfaces specification to be hierarchical and centralized in some way. I mean, I would like to specify the external interface of my application, then the internal interfaces, then the internal interfaces of the internal interfaces and so on. And I would like this information to be stored in one object that resembles the hierarchy. I was thinking in using an structure with BusObjects as elements.
Unfortunately, it seems that, for a bus object to work, it must be declared on the Matlab workspace as an independent variable of class BusObject. It cant be an element of an structure that is a BusObject, or an element of a cell whose elements are BusObjects or an element of a BusObject vector.
Any suggestion on how to handle this? take into account that if you have a model with dozens and dozens of blocks and more than 3 hierarchy levels, then you end up with hundreds of bus objects in the Matlab workspace without any particular structure... I think that is too messy to let it be...
Bus objects are always stored in the global workspace.
Send a request to Mathworks if you want to change this.
I have a simulink car model which includes different part of a car obviously (subsystems):). I want to isolate a part of this model, for example, brakes, and feed in dummy variable as inputs.
My problem is that this model has few bus selector and creator, which makes it a little bit complicated. I wonder how I can isolate the brakes part without messing up the buses.
When you say isolate, do you mean you want to move the contents of the subsystem into a separate model? If so, one way to do this is to use the "Convert to Model block" tool. To use this,
Make sure the subsystem is atomic (set_param(subsys, 'TreatAsAtomicUnit','on');).
Right-click on the subsystem and choose Convert to Model block.
The tool might ask you to make a few changes to the model.
At the end of the process, you will have a new model with the contents of the subsystem, and the tool will create any bus objects that are needed.