solving a quartic using simulink

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Amir Khan
Amir Khan 2011-8-7
回答： Sulaymon Eshkabilov 2019-5-4
Hi, I have a general quartic equation. I have solved it in maple and Mupad both but I want to create a block in simulink so that when I provide different values of the coefficients to the block, it gives me the solution of that quartic equation for that particular set of coefficients. Can somebody help? Thanks in advance.

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Walter Roberson
Walter Roberson 2011-8-7
MuPad provides matlabFunction() that can generate MATLAB code. You would then use a MATLAB Block if I recall.
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Amir Khan
Amir Khan 2011-8-8
Thanks Walter! Can you tell me how can I do that? Im new to it and struggling with it

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Sulaymon Eshkabilov
Hi,
Here are the steps to model a simple quadratic equation:
% Step 1. Drag and drop three [Constant] blocks into your Model window for a, b, c whose values you can define directly in each block, or via workspace (MATLAB command window), or via Model properties:==> File ->Model Properties -> Callbacks ->IntitFcn: a = ???; b= ???; c =???;
% Step 2. Drag and drop [Display] block into your Model window.
% Step 3. Drag [MATLAB Function] block and double click on it. Write the following two lines of code in the opened M-file editor and save it:
function y = fcn(a, b, c)
y=roots([a, b, c]);
% Step 4. When you save your fcn() file - M-file editor saves your Simulink model. Now, your [MATLAB Function] block will have three input ports for [a], [b],[c], respectively.
% Step 5. Connect three [Constant] block with the [MATLAB Function] block and output port of it with [Display] block. Now the model is complete, BUT it has a problem with the output data size.
% Step 6. Click on Model Explorer (Ports and Data Manager) -> [MATLAB Function] -> y Output -> Enter: 2 in size and put a tick mark on Variable Size option -> hit [Apply].
% Step 7. Hit [Run] and have fun ... :) . See the screenshot of the complete model and its results shown here.
% Note: Solver of your model has to be set at "Fixed Step". By default the Simulink model solver is set at "Variable Step" solver option.

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