Scilab Function

fplot3d1 - 3D gray or color level plot of a surface defined by a function

### Calling Sequence

  `fplot3d1(xr,yr,f,[theta,alpha,leg,flag,ebox])`
  `fplot3d1(xr,yr,f,<opt_args>)`

### Parameters

- `xr` : row vector of size n1.
- `yr` : row vector of size n2.
- `f` : external of type z=f(x,y).
- `theta,alpha,leg,flag,ebox` : see `plot3d1` .
- `<opt_args>` : see `plot3d` .

### Description

`fplot3d1` plots a 3D gray or color level plot of a surface defined by the external function `f` on the grid defined by `xr` and `yr` .

Enter the command `fplot3d1()` to see a demo.

### Examples

    deff('z=f(x,y)','z=x^4-y^4')
    x=-3:0.2:3 ;y=x ;
    clf() ;fplot3d1(x,y,f,alpha=5,theta=31)

### See Also

`plot3d1` ,

### Author

J.Ph.C.