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Please note that the recommended version of Scilab is 6.1.0. This page might be outdated.

See the recommended documentation of this function

# contour2di

compute level curves of a surface on a 2D plot

### Calling Sequence

[xc,yc]=contour2di(x,y,z,nz)

### Arguments

- x,y
two real row vectors of size n1 and n2: the grid.

- z
real matrix of size (n1,n2), the values of the function.

- 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 as follows:z= zmin + (1:nz)*(zmax-zmin)/(nz+1)

Note that the

`zmin`

and`zmax`

levels are not drawn (generically they are reduced to points) but they can be added withIf

`nz`

is a vector,`nz(i)`

gives the value of the ith level curve.

- xc,yc
vectors of identical sizes containing the contours definitions. See below for details.

### Description

`contour2di`

computes level curves of a surface `z=f(x,y)`

on
a 2D plot. The values of `f(x,y)`

are given by the matrix `z`

at the grid points defined by `x`

and `y`

.

`xc(1)`

contains the level associated with first contour path,
`yc(1)`

contains the number `N1`

of points defining this contour path
and (`xc(1+(1:N1))`

, `yc(1+(1:N1))`

) contain the coordinates
of the paths points.
The second path begin at `xc(2+N1)`

and `yc(2+N1)`

and so on.

### Examples

### See Also

- contour — level curves on a 3D surface
- fcontour — level curves on a 3D surface defined by a function
- fcontour2d — level curves of a surface defined by a function on a 2D plot
- contour2d — level curves of a surface on a 2D plot
- plot2d — 2D plot
- xset — set values of the graphics context. This function is obsolete.

### Authors

J.Ph.C.

## Comments

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