Integration of "Which"

*To*: mathgroup at smc.vnet.net*Subject*: [mg32113] Integration of "Which"*From*: klepachd at yahoo.com (Doron)*Date*: Thu, 27 Dec 2001 03:34:15 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hello, and thank you for your help . This is as a follow up to my last question about integration of Which . My problem is alittle more complicated: W[i_, x_]:= Which[[i == 1,Which[0 <= x <= 1/2, 0, 1/2 < x <= 1,2(x - 1)], i == 2,Which[0 <= x <= 1/2, 2x, 1/2 < x <= 1, 2(1 - x)] i == 3,Which[0 <= x <=\ 1/2, 1 - 2x, 1/2 < x <= 1,0 ]]; k[x_] := 1 + x; K[i_, j_, x_] := N[-(Integrate[D[W[j, x], x]* D[W[i, x], x]*k[x], {x, 0, 1/2}] + Integrate[D[W[j, x], x]* D[W[i, x], x]*k[x], {x, 1/2, 1}])] so I can`t use UnitStep , maybe ramp will work? Anyway I can`t integrate this , is there a way to solve this ?