Vector Piecewise in 5.1

*To*: mathgroup at smc.vnet.net*Subject*: [mg52996] Vector Piecewise in 5.1*From*: "Mark Fisher" <mark at markfisher.net>*Date*: Sun, 19 Dec 2004 06:14:40 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

To my surprise (and delight) it turns out that Piecewise in 5.1 can handle vectors (to some extent): pw1 = Piecewise[{{x, x > 0}}] pw2 = Piecewise[{{x2, x > 0}}] pw = PiecewiseExpand[{pw1, pw2}] This can even be compiled successfully: cf = Compile[{x}, Evaluate[pw]] And differentiated: D[pw, x] But not, however, integrated: Integrate[pw, x] (Worse, Integrate[pw, {x, 0, 3}] returns a scalar.) Is this a bug or just the absence of an undocumented feature? --Mark

**Follow-Ups**:**Re: Vector Piecewise in 5.1***From:*Murray Eisenberg <murray@math.umass.edu>