Getting error while using .m files in MATLAB function block in simulink.
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Hello,
I am currently working on creating a custom RMS block within MATLAB's Simulink environment.
My goal is to replicate the functionality of the standard RMS block using a MATLAB function.
I have developed an .m file (attached) that calculates the RMS value. However, I am encountering difficulties in implementing this code within the Simulink Function block.
Could anyone assist me in resolving this issue?
thank you
-Madhusudan reddy
3 个评论
Aquatris
2024-7-5
编辑:Aquatris
2024-7-5
and do you copy paste the code you attached to your question to the Simulink matlab function block?
If so, it is not in the right format. That block expects a function in the form shown below, where x and t becomes input ports and y and z becomes the output port of the matlab function block. You can define however many inputs and outputs to your function by simply adding or removing arguments
function [y,z]=myFun(x,t)
%% stuff
end
回答(1 个)
Garmit Pant
2024-7-5
Hello Madhusudan
To replicate the functionality of the ‘RMS’ block in Simulink using a MATLAB function, you need to use the Simulink’s MATLAB Function Block.
First, you need to edit your M-File to work as a function. Following code snippet has the necessary edits for your code to run with Simulink.
function a = call_rms()
amplitude = 240*sqrt(2); % Amplitude of the sine wave
frequency = 60; % Frequency of the sine wave in Hz
phase = 0; % Phase of the sine wave in radians
duration = 1; % Duration of the sine wave in seconds
sampling_rate = 1e6; % Sampling rate in Hz
% Generate the time vector
t = 0:1/sampling_rate:duration;
% Calculate cycle parameters
cycle_period = 1/frequency;
num_cycles = duration/cycle_period;
num_samples_per_cycle = cycle_period * sampling_rate;
% Generate the sine wave
y = amplitude * sin(2*pi*frequency*t + phase);
% Calculate RMS (adjusting the loop)
rms_ary = zeros(1,round(num_samples_per_cycle*num_cycles));
rms_mean = zeros(1,round(num_samples_per_cycle*num_cycles));
rms = zeros(1,round(num_cycles)); % Store RMS for each cycle
for i = 1:round(num_cycles)
start_index = (i-1)*num_samples_per_cycle + 1;
end_index = min(i*num_samples_per_cycle, length(y)); % Ensure we don't go out of bounds
rms_ary = y(round(start_index):round(end_index)).^2;
rms_mean(i) = mean(rms_ary);
rms(i) = round(sqrt(rms_mean(i)));
end
a = rms(1);
end
Save the file as ‘call_rms.m’.
In Simulink, insert the MATLAB Function block and double click on it to configure it. Add the following code snippet to the code editor of the MATLAB function block:
function y = rms_custom()
y = call_rms();
Running this model will simulate the function of RMS block. You can make changes to the ‘call_rms.m’ file to generate different sine waves.
You can also refer to the following MATLAB Answers post to resolve some commonly faced errors while using the MATLAB Function block workflow:
I hope you find the above explanation and suggestions useful!
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