how to plot a hexagonal finite element and its shape function?

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shape function is given by:
N1 = -0.6429−

Answer 1

[KSSV]

n = 10 ;
eta = linspace(0,1,n) ;
neta = linspace(0,1,n) ;
[X,Y] = meshgrid(eta,neta) ;

N = -0.6429-X+1.1429*X.^2+0.8571*Y.^2+1.5*X.^3+0.8333*X.*Y.^2-1.5238*X.^2.*Y.^2 ;
surf(X,Y,N)

[JITHA K R]

i wanted to plot hexagon on x y axis and then plot value of N1 at every node of hexagon.also it should give value of 1 at node 1 and all other nodes it should be zero.