tried

lab6/lab6_me.m

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+%% Ex. 1: solve for min of x^3 e^-x.
+options=optimset('Display','Iter','TolFun',1e-8);
+f1 = @(x) x.^3 .* exp(-x)
+[x, fv, e, o] = fminbnd(f1, 1, 5, options);
+disp("its: " + o.iterations)
+fplot(f1, [1 4])
+
+%% Ex2: min of xy e(-(x2+y2))
+
+f2 = @(xy) xy(1).*xy(2).*exp(-(xy(1).^2+xy(2).^2))
+[x, fv, e, o] = fminsearch(f2, [1 -1], options);
+disp("its: " + o.iterations)
+fsurf(@(x, y)f2([x, y]), [-2 2 -2 2])

lab6/yprime.m

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+function yprime_val = yprime(t,y)
+% ODE function for Exercise 5
+yprime_val = t.^2 + y; % 
+end