fcontour2d - level curves of a surface defined by a function on a 2D plot

Calling Sequence

fcontour2d(xr,yr,f,nz,[style,strf,leg,rect,nax])

fcontour2d(xr,yr,f,nz,<opt_args>)

Parameters

• xr,yr : two real row vectors of size n1 and n2.
• f : is an external which defines the surface z=f(x,y). It is first computed on the grid specified by xr,yr. Then, control is passed to the routine contour2d.
• nz : the level values or the number of levels.
• - If nz is an integer, its value gives the number of level curves equally spaced from zmin to zmax.
• - If nz is a vector, nz(i) gives the value of the ith level curve.

<opt_args> : This represents a sequence of statements key1=value1, key2=value2,... where key1, key2,... can be one of the following: style, leg, rect, nax, strf or axesflag and frameflag (see plot2d)

• [style,strf,leg,rect,nax] : see contour2d.

Description

Draws level curves of a surface z=f(x,y). The level curves are drawn on a 2D plot. The surface is given by the external function f. See contour2d.

You can change the format of the floating point number printed on the levels by using xset("fpf",string) where string gives the format in C format syntax (for example string="%.3f"). Use string="" to switch back to default format and Use string=" " to suppress printing.

Enter the command fcontour2d() to see a demo.

Examples

deff('z=surf(x,y)','z=x^4-y^4')
x=-3:0.1:3;
y=x;
fcontour2d(x,y,surf,10);
 

See Also

contour  contour2d  fcontour  

Author

J.Ph.C.