Create and Visualize Discriminant Analysis Classifier linear function problems to plot or create

Hello!
I have problems with this part:4
f = @(x1,x2) K + L(1)*x1 + L(2)*x2;
figure %create 2D plot
di2 = feval(f)
%Not enough input arguments.
%Error in @(x1,x2)K+L(1)*x1+L(2)*x2
originally is with fimplicit, but in my version of MTL dosent work, I follow the steps as mention in the link, but not resault.
Any idea will be appreciated!
Thanks

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