Error on using rotate - to many input arguments

Hi,

I wanted to get the area of evolution of a function. so i tried a code that someone used on youtube. I did the same as he did , but iget an error.

May you can help.

clear
x = linspace(0, 1, 21);
% y = 1.38188 - 0.58417*x + 0.09832*x.^2 - 0.00787*x.^3 + 0.000258*x.^4
y = 2*x.^2;
plot(x,y); daspect([1,1,1])
z = y; y = 0*y;
X = x; Y = y; Z = z;
[x,y,z] = rotate(x,y,z,[0,0,1],pi/20);
X = [X,x]; Y = [Y,y]; Z = [Z,z];
S = surf(X, Y, Z);
axis([-1,1,-1,1,0,2]); daspect([1,1,1]);

error is:

Error using rotate

Too many input arguments.

Error in areofrevolution (line 10)

[x,y,z] = rotate(x,y,z,[0,0,1],pi/20);

Answer 1

[Walter Roberson]

MATLAB offers several different rotate() functions -- but all of them are effectively class methods -- functions that only operate if the first parameter is a particular data type. None of the MATLAB rotate() methods support numeric values as the first parameter to rotate -- no x y z centre of rotation.

The YouTube video must have been using its own rotate() function, which you would have to locate the code for.

(My above statements are not completely true. The function that is rotate(H, [THETA PHI],ALPHA) or rotate(H,[X Y Z],ALPHA) will accept a numeric scalar in the H position, provided that the value given is the double precision representation of an axes child. For example,

format long g
s = surf(peaks(20));
sd = double(s)

sd = 
          10.0054931640625

rotate(sd, [1 0 0], 25)

This is a nearly-obsolete syntax.)

[Tim Sieber]

ok thank you, so it is because i want to rotate a point. so how can i solve this?

I have a polynom of 4th grade and need to get the surface area of evolution.

May you have an advice. I tried several answers here on matlabanswers but didnt get a working solution

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/15559-solids-of-revolution and https://www.mathworks.com/matlabcentral/answers/1716995-revolving-a-curve-about-the-y-axis-to-generate-a-3d-surface

[Tim Sieber]

edit:

the first one would be nice, but always gives me errors. even with the example

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/67585-solids-of-revolution-gui?s_tid=ta_fx_results worked for me. (Note: 3D plot figure was behind 2D plot figure, move the 2D plot to see it)