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determination des fonction d'interpolation


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dans mon cours et sur les cours internet pour determiner les fonction interpolation les explications sont :

u(-1)=q1 , u(0)=q2 , u(1)=q3


N1(-1)=1 N2(-1)=N3(-1)=0

N2(0)=1 N1(0)=N3(0)=0

N3(1)=1 N1(1)=N2(1)=0

de là ils passe directement

N1®=0,5 (r^2-r)


N3®=0,5 (r^2+r)

comment ?

j'aimerai arriver a retrouver toute seul par exemple Nk d'une barre 4 noeud..

merci beaucoup


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