Arguments

x, y, z

3 vectors of the same length: cartesian coordinates of the curve's points.

X, Y, Z

matrices of the same size (nl,nc). Each column #i of the matrices provides the coordinates of the points for the ith curve.

styles

vector of nc=size(Z,"c") integers specifying the style -- line color or mark style -- of each curve. When it is specified, it must be bundled with Z into a list, using list(Z, styles).

By default, lines are drawn with colors indexed from 1 to nc in the current color map, without mark.

If styles(i)<0, the curve #i is plotted only with marks of style #|styles(i)|, without line.

Otherwise (styles(i)>0), the curve #i is rendered as a solid line of color #styles(i), without marks.

theta

Polar angle of the (OP) observation point to the north pole (Oz+), in degrees, from 0 to 180. Default = 35°.

alpha

Azimuth angle of the (OP) observation point, around the (OZ+) axis, in degrees. Default = 45°.

leg

single string setting the labels for the 3 axes. "@" is used as a labels separator. Default = "X@Y@Z"

flag = [type, box]

type and box have the same meaning as in plot3d:

type

Sets the axes scaling and bounding modes. Default = 2.

type	gca().isoview	data bounds
0	off	[0,1, 0,1, -1,1]
1	off	in ebox
2	off	from data points
3	on	in ebox
4	on	from data points
5	on	in ebox
6	on	from data points

Isometrical modes are rendered with gca().cube_scaling="off".

box

an integer controlling the display of the axes frame (default = 4).

Value	Displayed axes	Axes legends	gca().box	gca().axes_visible
0	none. No frame.	yes	"off"	"off"
1	not implemented. Like 0. Please use 0.
2	only axes lines on the back	NO	"hidden_axes"	"off"
3	full ungraduated box	yes	"on"	"off"
4	full box + 3 graduated axes	yes	"on"	"on"

ebox

Vector [xmin,xmax, ymin,ymax, zmin,zmax] of axes bounds, used and assigned to gca().data_bounds when the flag option is used with the type=1|3|5. By default set to [0,1, 0,1, 0,1].

Description

param3d() is used to plot a single 3D curve defined by its coordinates x, y and z.

The curve is an object of polyline type. When it is used just after param3d(), gce() returns the curve's identifier, from which all the curve's properties may be changed: color, line style, thickness, mark style and colors, etc.

param3d1() is used to plot a set of 3D curves, all having the same number of points. Then, gce().children returns the vector of identifiers of the whole set of curves.

The graphical identifier of the curve #i is gce().children($-i+1).

Examples

t = 0:0.1:5*%pi;
r = (max(t)-t)/10;

clf
param3d(r.*sin(t), r.*cos(t), t/10, 30, 72,"X@Y@Z",[4,4])

curve = gce();
curve.mark_mode = "on";
curve.mark_style = 10;
curve.mark_foreground = color("magenta");

box parameter illustrated with param3d1() used for a single curve :

t = (0:0.1:5*%pi)';
r = (max(t)-t)/10;
x = r.*sin(t); y = r.*cos(t); z = list(t/10, color("orange"));
Box = [0 2 3 4];

clf
for i = 1:4
   subplot(2,2,i)
   param3d1(x, y, z, 31, 72,"X legend@Y legend@Z legend",[4, Box(i)])
   title(msprintf("box = %d",Box(i)), "fontsize", 4)
end
gcf().children.children.thickness = 2; // for the 4 curves in a once
gca().sub_ticks = [4 4 4];             // only for the last axes

param3d1() used for an actual set of curves:

[X, Y] = ndgrid(-11:0.5:9);
R = sqrt(X.*X + Y.*Y) + %eps;
Z = sin(R)./R;

clf
subplot(1,3,1)
param3d1(X, Y, Z, 150, 85, flag=[2,4])

subplot(1,3,2)
param3d1(X, Y, Z, 150, 85, flag=[2,4])
gce().children.foreground = color("green");

subplot(1,3,3)
param3d1(X, Y, Z, 150, 85, flag=[2,4])
curves = gce().children;
curves(1:2:$).foreground = color("orange");
gca().box = "back_half";

gcf().children.foreground = color("grey70"); // box & ticks color for the 3 figures

[X, Y] = ndgrid(-11:0.5:9, -7:0.5:6); // x is the long side, y the short one
// => X has constant rows. Y has constant columns

clf

// Meshing lines at constant Y values
subplot(1, 3, 1)
R = sqrt(X.*X + Y.*Y) + %eps;
Z = sin(R)./R;
param3d1(X, Y, Z, 150, 85, flag=[2,4])

// Meshing lines at constant X values, with transposed X and Y:
subplot(1, 3, 2)
R = sqrt(X'.*X' + Y'.*Y') + %eps;
Z = sin(R)./R;
param3d1(X', Y', Z, 150, 85, flag=[2,4])

// With a curtain and filled curves to avoid messed overlaying parts
subplot(1, 3, 3)
[Xo, Yo] = ndgrid(-10:0.5:10);
R = sqrt(Xo.*Xo + Yo.*Yo) + %eps;
Zo = sin(R)./R;
    // we add the curtain on starting and ending sides
nc = size(Xo,"c");
zmin = min(Zo);
X = [Xo(1,:) ; Xo ; Xo($,:)];
Y = [Yo(1,:) ; Yo ; Yo($,:)];
Z = [zmin*ones(1,nc) ; Zo ; zmin*ones(1,nc)];
    // Rendering
param3d1(X, Y, Z, 150, 85, flag=[2,4])
e = gce();
e.children.fill_mode = "on";

// grey box for all axes:
gcf().children.foreground = color("grey70");

See also

• plot3d — 3D plot of a surface
• plot3d3 — mesh plot surface defined by rectangular facets
• scatter 3D — 3D scatter plot
• axes_properties — description of the axes entity properties
• polyline_properties — description of the Polyline entity properties