IAD

This constant controls the mesh adaption :

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IAD=0 : Fixed mesh. Normally, this choice should never be used, as it may result in spurious solutions. (Demo ext.)

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IAD$>$0 : Adapt the mesh every IAD steps along the family. Most demos use IAD=3, which is the strongly recommended value.

When computing ``trivial'' solutions to a boundary value problem, for example, when all solution components are constant, then the mesh adaption may fail under certain circumstances, and overflow may occur. In such case, try recomputing the solution family with a fixed mesh (IAD=0). Be sure to set IAD back to IAD=3 for computing eventual non-trivial bifurcating solution families.