I am trying to use the matlab function on my simulink model to model Voltage that is a function of vibration from my piezoelectric source. I wrote the code below but the code analyzer doesnt seem to read the function call line. How do I fix this?

Question

Judith Orinda 2020-7-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/567732-i-am-trying-to-use-the-matlab-function-on-my-simulink-model-to-model-voltage-that-is-a-function-of-v

评论： Judith Orinda 2020-7-20

function Vpiezo=fcn(vib)
w=12;
b=1;
h=0.4;
e31=11.2;
e33=(8.85*10^(-12))*1800;
delta=0.1;
L=5;
R=delta/(b*L*e33*w);
Vpiezo=(w*b*h*e31*R*vib)/(2(1+(b*L*e33*((w*R)/delta))));
end

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Answer 1

Walter Roberson 2020-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/567732-i-am-trying-to-use-the-matlab-function-on-my-simulink-model-to-model-voltage-that-is-a-function-of-v#answer_468183

在 MATLAB Online 中打开

Vpiezo=(w*b*h*e31*R*vib)/(2(1+(b*L*e33*((w*R)/delta))));
                          ^^

In MATLAB, the syntax 2(something) is an attempt to index the constant 2 with the content of the expression. This is not permitted sytax in MATLAB.

Note; MATLAB has absolutely no implied multiplication. If you want multiplication in MATLAB, you must always use the .* or * operation as appropriate to the circumstances.