writer these functions █(e[ρ(τ)]={■(ρ,&τ⟶0,@θ,&τ,κ⟶∞;)┤@var⁡[ρ(τ)]={■(0,&τ⟶0,@0,&τ,κ⟶∞,@σ^2 ρτ,&κ⟶0.)┤ ) in matlab

main.m
function e = function_e(rho, var)
    syms t k theta;
    e = subs(rho, t, 0) + theta*int(exp(-k*t)*subs(var, t, k), k, 0, Inf);
end

function var = function_var(sigma, rho)
    syms t k;
    var = subs(rho, t, 0)*(sigma^2);
    var = var + sigma^2*int(exp(-2*k*t)*subs(rho, t, k), k, 0, Inf);
end
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