神马文学网quiver函数
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QUIVER Quiver plot.%速度矢量
QUIVER(X,Y,U,V) plots velocity vectors as arrows with components (u,v)
at the points (x,y). The matrices X,Y,U,V must all be the same size
and contain corresponding position and velocity components (X and Y
can also be vectors to specify a uniform grid). QUIVER automatically
scales the arrows to fit within the grid.
QUIVER(U,V) plots velocity vectors at equally spaced points in
the x-y plane.
QUIVER(U,V,S) or QUIVER(X,Y,U,V,S) automatically scales the
arrows to fit within the grid and then stretches them by S. Use
S=0 to plot the arrows without the automatic scaling.
QUIVER(...,LINESPEC) uses the plot linestyle specified for
the velocity vectors. Any marker in LINESPEC is drawn at the base
instead of an arrow on the tip. Use a marker of '.' to specify
no marker at all. See PLOT for other possibilities.
QUIVER(...,'filled') fills any markers specified.
H = QUIVER(...) returns a vector of line handles.
Example:
[x,y] = meshgrid(-2:.2:2,-1:.15:1);
z = x .* exp(-x.^2 - y.^2); [px,py] = gradient(z,.2,.15);
contour(x,y,z), hold on
quiver(x,y,px,py), hold off, axis image
See also FEATHER, QUIVER3, PLOT.
QUIVER(X,Y,U,V) plots velocity vectors as arrows with components (u,v)
at the points (x,y). The matrices X,Y,U,V must all be the same size
and contain corresponding position and velocity components (X and Y
can also be vectors to specify a uniform grid). QUIVER automatically
scales the arrows to fit within the grid.
QUIVER(U,V) plots velocity vectors at equally spaced points in
the x-y plane.
QUIVER(U,V,S) or QUIVER(X,Y,U,V,S) automatically scales the
arrows to fit within the grid and then stretches them by S. Use
S=0 to plot the arrows without the automatic scaling.
QUIVER(...,LINESPEC) uses the plot linestyle specified for
the velocity vectors. Any marker in LINESPEC is drawn at the base
instead of an arrow on the tip. Use a marker of '.' to specify
no marker at all. See PLOT for other possibilities.
QUIVER(...,'filled') fills any markers specified.
H = QUIVER(...) returns a vector of line handles.
Example:
[x,y] = meshgrid(-2:.2:2,-1:.15:1);
z = x .* exp(-x.^2 - y.^2); [px,py] = gradient(z,.2,.15);
contour(x,y,z), hold on
quiver(x,y,px,py), hold off, axis image
See also FEATHER, QUIVER3, PLOT.