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`plot3d`

: 3D plotting of a matrix of points : plot3d(x,y,z) with x,y,z 3 matrices, z being the values for the points with coordinates x,y. Other
arguments are optional
`plot3d1`

: 3d plotting of a matrix of points with gray levels
`fplot3d`

: 3d plotting of a surface described by a function; z is given by an external z=f(x,y)
`fplot3d1`

: 3d plotting of a surface described by a function with gray levels

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