hello How I can plot the function f as a mesh or surface thanks for any help
d = 0.1;a = 0.7;t1 = -20:1:20;t2 = -20:1:20;t3 = -20:1:20;t4 = -20:1:20;x = cosd(t1).*(d.* sind(t2+t3+t4)+a_2 .*cosd(t2)+a* cosd(t2+t3));y = sind(t1).*(d.* sind(t2+t3+t4)+a_2 .*cosd(t2)+a.* cosd(t2+t3)); z = a.* sind(t2) - d.* cosd(t2+t3+t4) + a.* sind(t2+t3) ;f = sqrt(x.^2 + y.^2 + z.^2);
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