[PD] better tabread4~

[Mathieu Bouchard]

On Thu, 3 Jul 2008, Matt Barber wrote:

> I'm with you on the general piecewise Lagrange not being C1, but I
> don't think it follows that all other orders are discontinuous --
> can't they alternate?

No. Any derivative inherits all discontinuities from the original 
function. It's a basic fact of life.

> Therefore, since the terms match at the points on adjacent pieces, the
> 2nd derivative is continuous even though the first isn't.

Ok, well, there's usually a distinction made between a continuous function 
and one with holes. Even though you can use a limit operator to remove the 
holes, the result of that is just not the same function... unless you see 
that through limit-operator-coloured glasses.

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal, Québec