Man Scilab

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.

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