Re: Interpolation difficulty

*To*: mathgroup at smc.vnet.net*Subject*: [mg116588] Re: Interpolation difficulty*From*: Ray Koopman <koopman at sfu.ca>*Date*: Mon, 21 Feb 2011 04:19:57 -0500 (EST)*References*: <ijo544$lep$1@smc.vnet.net>

On Feb 19, 2:13 am, Javier <mathquesti... at gmail.com> wrote: > Interpolation[{{2, 1}, {4, 5}, {5, 2}}, InterpolationOrder -> 0] > gives a function which is 5 from 2 to 4, and 2 from 4 to 5. > > I want as a result a function which is 1 from 2 up to 4, then > 5 from 4 up to 5. It should extrapolate to x=1 giving also 1, > and to x=6 giving 2. Is this possible? Many thanks in advance. Sorry, but I forgot to include the answer to your question. f[x_] := Piecewise[{{1, 1 <= x < 4}, {5, 4 <= x < 5}, {2, 5 <= x < 6}}]