MATLAB: Syntax error in Simulink

errorsimulinksyntax

I am getting a syntax error in Simulink in a Fcn block:

((u(2)*(u(3))^2)/12)-((u(2)*u(3))^2)/8)*((1-2*(u(1)/u(3)))-(1/3)*(1-2*(u(1)/u(3)))^3)

I really can't find the problem in this so a little help is appreciated.

Best Answer

You have a problem with brackets

(u(2)*u(3)^2)/12-((u(2)*u(3))^2)/8*(1-2*u(1)/u(3))-(1/3)*(1-2*u(1)/u(3))^3

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MATLAB: How to generate an .stl file from a symbolically generated 3D surface

syms u v
x = (-2/15)*cos(u)* (3*cos(v) - 30*sin(u) + 90*(cos(u))^4*sin(u) - 60*(cos(u))^6*sin(u) + 5*cos(u)*cos(v)*sin(u))
y = (-1/15)*sin(u)* (3*cos(v) - 3*(cos(u))^2*cos(v) + 48*(cos(u))^4*cos(v) - 48*(cos(u))^6*cos(v) - 60*sin(u) + 5*cos(u)*cos(v)*sin(u) - 5*(cos(u))^3*cos(v)*sin(u) - 80*(cos(u))^5*cos(v)*sin(u) + 80*(cos(u))^7*cos(v)*sin(u))
z = (2/15)*(3+5*cos(u)*sin(u))*sin(v)
figure(2)
h = ezsurf(x,y,z,[0, pi, 0, 2*pi]) ;
X = h.XData ; 
Y = h.YData ; 
Z = h.ZData ;

Now use surf2stl: https://in.mathworks.com/matlabcentral/fileexchange/4512-surf2stl X,Y,Z.

MATLAB: Wont all 4 subplots not work

Because "2u" is not correct MATLAB syntax for multiplication. You need "2*u".

This code runs:

u = 0:360;
subplot(2,2,1)
fplot('cos(u-45)',[0 360])
subplot(2,2,2)
fplot('3*cos(2*u)-2',[0 360])
subplot(2,2,3)
fplot('sin(3*u)',[0 360])
subplot(2,2,4)
fplot('-2*cos(u)',[0 360])

Best Answer

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MATLAB: How to generate an .stl file from a symbolically generated 3D surface

MATLAB: Wont all 4 subplots not work

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