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
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- From: Murray Eisenberg <murray@math.umass.edu>
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