Problem with nested NIntegrate[]

*To*: mathgroup at smc.vnet.net*Subject*: [mg70213] Problem with nested NIntegrate[]*From*: "Eckhard" <e.schlemm at hotmail.de>*Date*: Sat, 7 Oct 2006 07:08:38 -0400 (EDT)

Hello, I encountered some strange behaviour of NIntegrate when I use a somewhat neseted structure of several - in my example of two - NIntegrate[] functions NIntegrate[NIntegrate[y,{x,-1,1}],{y,-1,1}] This gives me the error NIntegrate::"num Integrand y is not numerical at {x) = 0 Why does the inner NIntegrate function not know, what value is currently assigned to y... I hope someone can shed a little light on that seemingly paradoxical behaviour. thanks in advance Eckhard