3d plot in matlab

  1. i want to plot these equations in 3d

    Eq 1= 5x^2 - 2y^2 + 4x+ 4y -4 +2xy
    Eq 2 =x^2 +3x +2y +xy +5
    eq 3 = -7x2 +3x -6y +5xy +2

    i tried plot3 with 3 matix of x,y,z but i am not satisfied with the result.
    plz if any one know how to plot these equations.let me know
    thanks in advance
  2. jcsd
  3. What kind of plot are you trying to make? I'm going to assume a surface plot since you didn't specify. Here is an example using the "surf" command.

    x = 1:1:100;
    y = 1:1:100;
    [X,Y] = meshgrid(x,y);
    Z = X.^2.*Y.^3;
  4. wel these 3 equations will represent 3 coordianted of plot(x,y,z)
    combine plot of these equation. i have tried
    ezsurf('-5*x.^2 - 2*y.^2 + 2*(x.*y) + 4*y + 4*x -4' ,'x.^2 +3*x +2*y +x*y +5 ','-7*x.^2 +3*x -6*y +5*(x.*y) +2 ');
    thats work
  5. Hi, I have 3 vectors of the same dimensions and want to plot a graph in 3D as surface or volume. I tried but I couldn't. Any body knows?
    Vectors arr:
    A=[2 5 15 25 30]
    B=[0.1 0.2 0.5 0.9 1.0]
    C=[1870 1890 1920 2000 2050]


  6. for this one u can use this,

    also mention the x and y values, ie starting and ending as x=1:10; y=1:10;

    surf(x,y,Eq 1);
    surf(x,y,Eq 2);
    surf(x,y,Eq 3);
  7. so u can try with this
  8. u can use plot3 function


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