Plot Wendland C2 function

i want to plot Wendland C2 function given by the expression

Z1 = ((1-R).^4*(4.*R+1));

i am using the following lines to plot

[X,Y] = meshgrid(-1:0.01:1); 
R = abs(sqrt(X.^2 + Y.^2)); 
Z1 = ((1-R).^4*(4.*R+1)); %Wendlands C2
surf(X,Y,Z1,'FaceColor','red','EdgeColor','none')

but i cannot plot it correct as shwon in the figure

need some help in this regard

[Irfan Badar]

Z1 = ((1-R).^4.*(4.*R+1)); %Wendlands C2

Answer 1

[Irfan Badar]

hope fully this will work [X,Y] = meshgrid(-1:0.01:1); R = abs(sqrt(X.^2 + Y.^2)); Z1 = ((1-R).^4.*(4.*R+1)); %Wendlands C2 surf(X,Y,Z1,'FaceColor','red','EdgeColor','none')