Unrecognized function or variable

Question

Joshua Primeaux 2021-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/739682-unrecognized-function-or-variable

回答： muhammad satriawan 2021-7-8

syms t
x(t) = piecewise (t>=0, sin(3*t), t>=2*pi, sin(3*t)^2, t>3*pi,0);
t1 =0:0.1:3*pi;
x=subs(x,t,t1);
plot(t1,x)
xlabel('Time')
ylabel('x(t)')
disp('Energy of x(t)')
Energy of x(t)
I1 = int(sin(3*t)^2);
I2 = int(sin(3*t)^4);
E = I1(2*pi)-I1(0)+I2(2*pi)-I2(3*pi)
Energy of x(t)
Unrecognized function or variable 'Energy'.

This is my code I'm not sure why it is saying unrecognized function any help would be appreciated thank you.

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Answer 1

Steven Lord 2021-2-8

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I suspect you copied and pasted what had been typed and/or displayed in the Command Window (including the text that your disp call displayed, namely "Energy of x(t)") into a file in the Editor/Debugger and tried to run it. You'll need to delete or comment out the displayed text in the file in the Editor/Debugger..

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Joshua Primeaux 2021-2-8

ok I fixed that now I'm getting

syms t

x(t) = piecewise (t>=0, sin(3*t), t>=2*pi, sin(3*t)^2, t>3*pi,0);

t1 =0:0.1:3*pi;

x=subs(x,t,t1);

plot(t1,x)

xlabel('Time')

ylabel('x(t)')

disp('Energy of x(t)')

I1 = int(sin(3*t)^2);

I2 = int(sin(3*t)^4);

E = I1(2*pi)-I1(0)+I2(2*pi)-I2(3*pi)

Index exceeds the number of array elements (1).

Error in sym/subsref (line 902)

R_tilde = builtin('subsref',L_tilde,Idx);

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Answer 2

madhan ravi 2021-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/739682-unrecognized-function-or-variable#answer_618207

在 MATLAB Online 中打开

Following Steven’s answer would clear that error but you will have a following error, so change that part of your code to the following:

 %Energy of x(t)
 I1(t) = int(sin(3*t)^2);
 I2(t) = int(sin(3*t)^4);
 E = I1(2*pi)-I1(0)+I2(2*pi)-I2(3*pi)
 %Energy of x(t)

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Joshua Primeaux 2021-2-8

Thank you that worked

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Answer 3

muhammad satriawan 2021-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/739682-unrecognized-function-or-variable#answer_742213

在 MATLAB Online 中打开

p = [ 0.1987 0.2722 0.0153 0.4451 0.466 0.8462 0.2026 0.8381 0.6813 0.8318 0.7095 0.3046 0.1934 0.3028 ;
    0.6038 0.1988 0.7468 0.9318 0.4186 0.5252 0.6721 0.0196 0.3795 0.5028 0.4289 0.1897 0.6822 0.5417 ];
 
net = newc ([0 1 ; 0 1],6);
net.IW {1,1};
net.b {1};
net = train (net,p);
%Mencari pengelompokan vektor
b = sim(net,p);
ac = vec2ind(b);
net = init(net);
net.trainParam.epochs = 500 ; %pelatihan kohonen
net = train(net,p);
Unrecognized function or variable 'newc'.
Error in JKohonen (line 5)
net = newc ([0 1 ; 0 1],6);