MATLAB Functions | Help Desk |
contourc
Low-level contour plot computationC = contourc(Z) C = contourc(Z,n) C = contourc(Z,v) C = contourc(x,y,Z) C = contourc(x,y,Z,n) C = contourc(x,y,Z,v)
contourc
calculates the contour matrix C
used by contour
, contour3
, and contourf
. The values in Z
determine the heights of the contour lines with respect to a plane. The contour calculations use a regularly spaced grid determined by the dimensions of Z
.
C = contourc(Z)
computes the contour matrix from data in matrix Z
, where Z
must be at least a 2-by-2 matrix. The contours are isolines in the units of Z
. The number of contour lines and the corresponding values of the contour lines are chosen automatically.
C = contourc(Z,n)
computes contours of matrix Z
with n
contour levels.
C = contourc(Z,v)
computes contours of matrix Z
with contour lines at the values specified in vector v
. The length of v
determines the number of contour levels. To compute a single contour of level i
, use contourc(Z,[i i])
.
C = contourc(x,y,Z), C = contourc(x,y,Z,n), and
C = contourc(x,y,Z,v)
compute contours of Z
using vectors x
and y
to determine the x- and y-axis limits. x
and y
must be monotonically increasing.
C
is a two-row matrix specifying all the contour lines. Each contour line defined in matrix C
begins with a column that contains the value of the contour (specified by v
and used by clabel
), and the number of (x,y)
vertices in the contour line. The remaining columns contain the data for the (x,y)
pairs.
C = [value1xdata(1)xdata(2)...value2xdata(1)xdata(2)...;x
and y
vectors is not the same as contouring irregularly spaced data. If x
or y
is irregularly spaced, contourc
calculates contours using a regularly spaced contour grid, then transforms the data to x
or y
.
clabel
, contour
, contour3
, contourf