Plot 3D Eqns in MATLAB: 5x^2 - 2y^2 + 4x+ 4y -4 +2xy etc

[cpeng]

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.
please if anyone know how to plot these equations.let me know
thanks in advance

 

[Topher925]

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;
surf(X,Y,Z)

 

[cpeng]

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

 

[pkmalik]

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]

thanks,
PK

 

[pashasrp67]

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.
please if anyone know how to plot these equations.let me know
thanks in advance

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);

 

[pashasrp67]

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;
figure;
surf(x,y,Eq 1);
surf(x,y,Eq 2);
surf(x,y,Eq 3);
hold on

so u can try with this

 

[pashasrp67]

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]

thanks,
PK

u can use plot3 function

as

plot3(A,B,C);