Contour Diagrams. restart:with(plots): setoptions3d(axes=normal,labels=["x","y","z"],orientation=[20,70]);
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- Buddy Fletcher
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1 > > We start with the graph of z = f x, y = > z:=sqrt(x^2+y^2); > Contour Diagrams restart:with(plots): setoptions3d(axes=normal,labels=["x","y","z"],orientation=[20,70]); x 2 C y 2 and we plot its graph. z := x 2 C y 2 plot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9],style=patchnogrid) ; The graph appears to be that of an inverted cone of height 9. To find a contour line or level set for the surface, we first look at the intersection of the surface with a horizontal plane, say the plane z = 6. > p1:=plot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9],style= patchnogrid): p2:=plot3d(6,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9],style= patchnogrid): p3:=plot3d([6*cos(t),6*sin(t),6],t=0..2*pi,u=0..5): display(p1,p2,p3);
2 > Then we project the curve(s) of intersection onto the xy-plane to get the contour line(s) or level set. p1:=plot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9],style= wireframe): p2:=plot3d(6,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9],style= wireframe): p3:=plot3d([6*cos(t),6*sin(t),6],t=0..2*pi,u=0..5): p4:=plot3d([6*cos(t),6*sin(t),0],t=0..2*pi,u=0..5): p5:=plot3d([-6,0,t],t=0..6,u=0..5): p6:=plot3d([6,0,t],t=0..6,u=0..5): p7:=plot3d([0,-6,t],t=0..6,u=0..5): p8:=plot3d([0,6,t],t=0..6,u=0..5): display(p1,p2,p3,p4,p5,p6,p7,p8);
3 Using the plottools package and the transform command, we can get another view at how the contour diagram is developed by the intersections of planes with the surface being projected onto the xy-plane. > with(plottools); annulus, arc, arrow, circle, cone, cuboid, curve, cutin, cutout, cylinder, disk, dodecahedron, ellipse, > ellipticarc, exportplot, extrude, getdata, hemisphere, hexahedron, homothety, hyperbola, icosahedron, importplot, line, octahedron, parallelepiped, pieslice, point, polygon, prism, project, rectangle, reflect, rotate, scale, sector, semitorus, sphere, stellate, tetrahedron, torus, transform, translate p := plot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9],style= contour,contours=8): q := contourplot(z,x=-9..9,y=-9..9): f := transform((x,y) -> [x,y,0]): display({p,f(q)});
4 > A modification of the above shows the contours on the surface itself. p := contourplot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..9], filled=true): q := contourplot(z,x=-9..9,y=-9..9,filled=true): f := transform((x,y) -> [x,y,0]): display({p,f(q)});
5 Now let's focus on just the contourplot for this surface. The option"scaling=constrained" is used to get the same scale on both the x- and the y-axis. > contourplot(z,x=-9..9,y=-9..9,scaling=constrained);
6 8 6 y 4 2 K8 K6 K4 K x K2 K4 K6 K8 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Maple chooses 8 equally spaced levels by default, with the contours colored in shades from red to blue as they increase in size. You can also choose to fill in the contours > contourplot(z,x=-9..9,y=-9..9,scaling=constrained,filled=true);
7 You can choose how many contours you wish. > contourplot(z,x=-9..9,y=-9..9,contours=20,scaling=constrained);
8 8 y K8 K6 K K2 x K4 K6 K8 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 Curve 10 Curve 11 Curve 12 Curve 13 Curve 14 Curve 15 Curve 16 Curve 17 Curve 18 Curve 19 Curve 20 You can also choose the levels for your contours. > contourplot(z,x=-9..9,y=-9..9,contours=[1,2,3,4,5,6,7,8,9],scaling= constrained);
9 8 6 y 4 2 The equal spacing of the contours for this function is due to the fact that the "sides" of the cone increase at a constant rate. Let's compare our original function to z=g x, y = x 2 C y 2. > z:=x^2+y^2; z := x 2 C y 2 > K8 K6 K4 K K2 x K4 K6 K8 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 plot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..60],style= patchnogrid);
10 We see that the sides here do not increase at a constant rate. We consider 20 equally spaced contours, the multiples of 3 from 3 to 60. > contourplot(z,x=-9..9,y=-9..9,contours=[seq(3*i,i=1..20)],scaling= constrained);
11 6 y 4 2 K6 K4 K K2 x K4 K6 We see that the contours become closer as the height of the level increases, indicating a greater rate of change in the positive direction as the height of the level increases. Now let's flip this surface upside down. > z:=60-(x^2+y^2); z := Kx 2 K y 2 C 60 > Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 Curve 10 Curve 11 Curve 12 Curve 13 Curve 14 Curve 15 Curve 16 Curve 17 Curve 18 Curve 19 Curve 20 plot3d(z,x=-9..9,y=-9..9,view=[-9..9,-9..9,0..60],style= patchnogrid);
12 > We compare the contour plot here with the previous one. contourplot(z,x=-9..9,y=-9..9,contours=[seq(3*i,i=1..20)],scaling= constrained,filled=true);
13 We see that the contours become closer as the height of the level decreases, indicating a greater rate of change in the negative direction as the height of the level decreases. We next look at a more interesting surface, the saddle, with this one given by the function z = f x, y = x 2 K y 2. > z:=x^2-y^2; z := x 2 K y 2 > plot3d(z,x=-4..4,y=-4..4,style=patchnogrid);
14 > We look first at the level z = 0. p1:=plot3d(z,x=-4..4,y=-4..4,style=patchnogrid): p2:=plot3d(0,x=-4..4,y=-4..4,style=patchnogrid,color=blue): p3:=plot3d([x,x,0],x=-4..4,y=-4..4,thickness=5): p4:=plot3d([-x,x,0],x=-4..4,y=-4..4,thickness=5): display(p1,p2,p3,p4);
15 A close inspection suggests the plane intersects the saddle in two intersecting lines. Changing the view gives a better perspective on this. > p1:=plot3d(z,x=-4..4,y=-4..4,style=patchnogrid): p2:=plot3d(0,x=-4..4,y=-4..4,style=patchnogrid,color=blue): p3:=plot3d([x,x,0],x=-4..4,y=-4..4,thickness=5): p4:=plot3d([-x,x,0],x=-4..4,y=-4..4,thickness=5): display(p1,p2,p3,p4,orientation=[27,32]);
16 In fact, the lines we see are the lines x C y = 0 and x K y = 0. What will we get from the intersections of other horizontal planes? We look at the contour diagram for 19 equally spaced contours. > contourplot(z,x=-9..9,y=-9..9,contours=[seq(3*i,i=-9..9)],scaling= constrained);
17 8 y K8 K6 K K2 x K4 K6 K8 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 Curve 10 Curve 11 Curve 12 Curve 13 Curve 14 Curve 15 Curve 16 Curve 17 Curve 18 Curve 19 We first notice the two intersecting lines at the origin resulting from the plane z = 0 viewed above. The nine horizontal planes for negative levels intersect the saddle in hyperbolas, with the two branches shown above and below the x-axis in shades of red. The nine horizontal planes for positive levels also intersect the saddle in hyperbolas, but with the two branches shown left and right of the y-axis in shades of blue. We view another contourplot for the same function. > contourplot(z,x=-9..9,y=-9..9,contours=20,scaling=constrained);
18 8 y Next we look at the contour diagram for a plane. > z:=-4*x-3*y+24; z := K4 x K 3 y C 24 > K8 K6 K K2 x K4 K6 K8 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 Curve 10 Curve 11 Curve 12 Curve 13 Curve 14 Curve 15 Curve 16 Curve 17 Curve 18 Curve 19 Curve 20 plot3d(z,x=-8..8,y= ,view=[0..8,-0..10,0..26],style= patchnogrid);
19 The contour diagram. > contourplot(z,x= ,y= ,contours=20,scaling=constrained);
20 10 y 5 K10 K x K5 K10 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 Curve 10 Curve 11 Curve 12 Curve 13 Curve 14 Curve 15 Curve 16 Curve 17 Curve 18 Curve 19 Curve 20 Notice that the contours are parallel lines. Our final surface has many interesting aspects. > z:=cos(x)*cos(y)*exp(-sqrt(x^2+y^2)/4); z := cos x cos y e K1 4 x 2 C y 2 > plot3d(z,x= ,y= ,style=patchnogrid,numpoints=5000);
21 > We view a contour diagram with 20 equally spaced contours. contourplot(z,x= ,y= ,contours=20,scaling=constrained, numpoints=5000);
22 10 y 5 K10 K x K5 K10 Curve 1 Curve 2 Curve 3 Curve 4 Curve 5 Curve 6 Curve 7 Curve 8 Curve 9 Curve 10 Curve 11 Curve 12 Curve 13 Curve 14 Curve 15 Curve 16 Curve 17 Curve 18 Curve 19 Curve 20 This contour diagram shows that the most radical behavior for this function lies near the origin of the xyplane (deep reds and blues) with the surface staying pretty close to the xy-plane away from the origin (violets away from the origin). Last, we look at the 3d and 2d contour diagrams together. > p := contourplot3d(z,x=-9..9,y=-9..9,filled=true): q := contourplot(z,x=-9..9,y=-9..9,filled=true): f := transform((x,y) -> [x,y,-1]): display({p,f(q)});
23 Density Plots We use the densityplot command to form density plots. We will use the saddle function as an example. > z:=x^2-y^2; z := x 2 K y 2 > densityplot(z,x=-9..9,y=-9..9);
24 We can remove the gridlines. > densityplot(z,x=-9..9,y=-9..9,style=patchnogrid);
25 We can choose a color. > densityplot(z,x=-9..9,y=-9..9,style=patchnogrid,color=green);
26 We can use a variety of colors. > densityplot(z,x=-9..9,y=-9..9,style=patchnogrid,colorstyle=hue);
27 > Finally, we can change the brightness and contrast. densityplot(z,x=-9..9,y=-9..9,style=patchnogrid,colorstyle=hue, brightness=0.7,contrast=0.7);
28
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