CONTOUR_GRADIENT
Contours and Gradient Vectors for F(X,Y)

CONTOUR_GRADIENT is a MATLAB program which displays contour lines and gradient vectors for a function f(x,y).

Usage:

contour_gradient ( xmin, xmax, ymin, ymax, @f )

• xmin, xmax, ymin, ymax specify the plotting rectangle;
• @f is a handle to a function z = f(x,y).

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

CONTOUR_SEQUENCE4, a MATLAB program which makes a sequence of contour plots based on a single XY coordinate file, and a sequence of Z(X,Y) data files.

DIST_PLOT, a MATLAB program which makes contour plots of the distance function, as defined and used in Persson and Strang's distmesh, code;

LEVELS, a MATLAB library which makes a contour plot, choosing the contour levels using random sampling.

TRIANGULATION_ORDER3_CONTOUR, a MATLAB program which makes contour plot of scattered data, or of data defined on an order 3 triangulation.

TRIANGULATION_ORDER6_CONTOUR, a MATLAB program which makes contour plots of data defined on an order 6 triangulation.

TWOD_PLOTC, a MATLAB program which makes a color contour plot of scalar data defined on a 2D finite element mesh.

VECTOR_MAGNITUDE_GRID, a MATLAB program which reads vector data at "scattered" points, computes an interpolatory function, evaluates it on a uniform grid of user-specified density, and produces a contour plot of the vector magnitude.

Source Code:

• contour_gradient.m, plots contours and gradients of a function f(x,y).
• timestamp.m, prints the current YMDHMS date as a time stamp.

Examples and Tests:

• contour_gradient_test01.m, tests CONTOUR_GRADIENT on a simple function.
• test01.png, the image created by the test.

You can go up one level to the MATLAB source codes.