I'm wondering if there is a way to visualise symbols inside the transfer fcn block in Simulink.
I tried in this way, but it doesn't show the symbols:
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I have a MATLAB function block embedded in a Simulink model. In my initFnc callback I set up some vectors which I need to use in my function block inside the simulink model. The vector is 1x10000 and contains setpoints for a robotic arm. The function block simply needs to read the next value at each sample iteration.
So far I've tried using "From Workspace" and "evalin()" but they all throw various errors when building the model (I'm using code generation which doesn't play nice all the time).
What would be a good way to read in that vector in Simulink and feed the cells one by one into my function block? Something like repeating sequence stair but without the repeating part.
I got it to work by reading in the vector into a constant block and feeding that into my embedded function. I then use a persistent iterator which is a 1x1 matrix (ones(1)) and incrementing it every time the value from the vector is read.
I want to draw the output from a QPSK modulator in simulink
but scope block couldn't do that and a message say that the signal is complex and so scope couldn't draw it.
How can I plot such signal and what a block could be used to get the output from QPSK modulator.
thanks
You need to separate it into real and imaginary parts using the Complex to Real-Imag block and then you can plot those signals on a scope. If you want them on the same scope, you can either change the scope parameters to have 2 inputs (similar to subplot in MATLAB) or multiplex the two signals together with a Mux block (to have two traces on the same set of axes).
I think it is better to put a raised cosine transmit filter after the QPSK modulator then plot the output using timescope
I want to model a for loop system in Simulink, how I can model the following MATLAB syntax into Simulink model?
N=3;
for i=0:1:N
sum(i+1)=factorial(i)/factorial(N);
end
I have tried for loop sub systems in Simulink and also Sum block for iteration loop but doesn't help me. factorial function can be calculated with FCN function.
Suggest me the ways to resolve this model with step time.
If you have the code already in matlab use a embedded matlab function to implement it i your simulink model. This is in general quite efficient since it will be compiled (compared to interpreted matlab function blocks)
I'm trying to build a Simulink model containing a "s-function block" simulating a continuous process with a "Matlab Function Block" that use the input and output from s-function.
But I need the input to the "Matlab Function Block" with differents values of the same signal over time. That is, a vector with different sampling times for each input to "Matlab Function Block". This will be needed for testing identification techniques.
How could I do this?
Thank you
Assuming you are using a fixed-step discrete solver, and that you don't have too many values of the same signal to hold, you could use Unit Delay blocks to get the value of the signal at previous time steps. You can then mux all these signals together to form your vector input. Obviously, the practicality of it is limited by how many values of the signals you need to have (and buffer).
How can I call an m file in Simulink and put it to a block in my model (without using an S function)? Does anybody have an idea? I'd really appreciate it.
If you're trying to apply a user-defined MATLAB function to Simulink signals, there are a few different ways to do this, depending on your objective. All options are available within the User-Defined Functions section of the Simulink library.
Use the MATLAB function block if you intend to generate code from your model. This block does have restrictions, the entire gamut of built-in MATLAB functions is not available.
Use the Interpreted MATLAB function block if you don't care about code generation, this block can make use of any functions.
Use the Fcn block if your m-file is trivial and contains a simple expression operating on the inputs. In this case you can type the expression directly into the block dialog and reference the input / output signals as shown in the documentation.
MATLAB Fcn block is the best solution to embed M-function file into Simulink model. However, be cautious which version of MATLAB you are using, e.g., with later versions of MATLAB Function Block can be implemented with M-function file with %#codegen and C compiler need to be with your MATLAB package. Good luck