# Extruding a 2d curve

1. Nov 20, 2012

### marellasunny

Hi all!
I would like to extrude a 2d curve in the X-Y plane along the Z direction,thereby wanting to obtain a plane of Z units long.How should I proceed?
Is there a tool especially for this in MATLAB?

2. Nov 20, 2012

### gsal

matlab or not, if all you want to do is extrude such line in a straight line, all you need to do is add the third dimension (z), add a bunch of consecutive numbers to it z=1,2,3,4... and then simply broadcast the same x,y values along the third dimension.

3. Nov 21, 2012

### marellasunny

Ok,I created it for a polynomial function(MATLAB CODE)
x=0:.1:10;
y=0:.1:10;
f=@(x)0.6.*x.^3+1.9.*x.^2+3.*x+25;
y=f(x);
z=zeros(size(x));
for i=0:.1:10
z1=z+i;
plot3(x,y,z1)
drawnow;
pause(eps);
hold on
end

Questionow do I 'fit' a surface through all these curves(assuming the curves are slightly different but parallel)?,how do I use these level curves to make a surface?"
I get an error saying"??? Error using ==> surf at 78
Z must be a matrix, not a scalar or vector." when I insert the command
surf(x,y,z1)
is creating a surface the same as creating a mesh?

Last edited: Nov 21, 2012
4. Nov 21, 2012

### gsal

first of all, I do not know matlab

second, your z1 variable is a one-dimensional vector only to which you are assigning, one at a time the values 0, 1, 2, 3, etc. Your z variable remains zero since initialized, you never assigned anything to it.

I think you first need to learn how to plot 3D, do an exercise from the user's manual and figure out what x, y, and z need to be.

5. Nov 21, 2012

### marellasunny

I am using z1 as the z coordinate,not z.
z1=z+i;
plot3(x,y,z1)