
// Make newform 3344.2.a.v in Magma, downloaded from the LMFDB on 25 April 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_3344_a();"
// To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
// To make the newform (type ModFrm), type "MakeNewformModFrm_3344_2_a_v();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose lines below.
// The precision argument determines an initial guess on how many Fourier coefficients to use.
// This guess is increased enough to uniquely determine the newform.
// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_3344_2_a_v();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function ConvertToHeckeField(input: pass_field := false, Kf := [])
    if not pass_field then
        poly := [-4, -6, 16, 11, -8, -2, 1];
        Kf := NumberField(Polynomial([elt : elt in poly]));
        AssignNames(~Kf, ["nu"]);
    end if;
    Rf_num := [[1, 0, 0, 0, 0, 0], [0, 1, 0, 0, 0, 0], [-3, -1, 1, 0, 0, 0], [-2, 4, 9, -6, -2, 1], [-4, 14, 11, -8, -2, 1], [14, 2, -23, 4, 4, -1]];
    Rf_basisdens := [1, 1, 1, 2, 2, 2];
    Rf_basisnums := ChangeUniverse([[z : z in elt] : elt in Rf_num], Kf);
    Rfbasis := [Rf_basisnums[i]/Rf_basisdens[i] : i in [1..Degree(Kf)]];
    inp_vec := Vector(Rfbasis)*ChangeRing(Transpose(Matrix([[elt : elt in row] : row in input])),Kf);
    return Eltseq(inp_vec);
end function;


// To make the character of type GrpDrchElt, type "MakeCharacter_3344_a();"
function MakeCharacter_3344_a()
    N := 3344;
    order := 1;
    char_gens := [2927, 837, 2433, 705];
    v := [1, 1, 1, 1];
    // chi(gens[i]) = zeta^v[i]
    assert UnitGenerators(DirichletGroup(N)) eq char_gens;
    F := CyclotomicField(order);
    chi := DirichletCharacterFromValuesOnUnitGenerators(DirichletGroup(N,F),[F|F.1^e:e in v]);
    return MinimalBaseRingCharacter(chi);
end function;

function MakeCharacter_3344_a_Hecke(Kf)
    return MakeCharacter_3344_a();
end function;


function ExtendMultiplicatively(weight, aps, character)
    prec := NextPrime(NthPrime(#aps)) - 1; // we will able to figure out a_0 ... a_prec
    primes := PrimesUpTo(prec);
    prime_powers := primes;
    assert #primes eq #aps;
    log_prec := Floor(Log(prec)/Log(2)); // prec < 2^(log_prec+1)
    F := Universe(aps);
    FXY<X, Y> := PolynomialRing(F, 2);
    // 1/(1 - a_p T + p^(weight - 1) * char(p) T^2) = 1 + a_p T + a_{p^2} T^2 + ...
    R<T> := PowerSeriesRing(FXY : Precision := log_prec + 1);
    recursion := Coefficients(1/(1 - X*T + Y*T^2));
    coeffs := [F!0: i in [1..(prec+1)]];
    coeffs[1] := 1; //a_1
    for i := 1 to #primes do
        p := primes[i];
        coeffs[p] := aps[i];
        b := p^(weight - 1) * F!character(p);
        r := 2;
        p_power := p * p;
        //deals with powers of p
        while p_power le prec do
            Append(~prime_powers, p_power);
            coeffs[p_power] := Evaluate(recursion[r + 1], [aps[i], b]);
            p_power *:= p;
            r +:= 1;
        end while;    
    end for;
    Sort(~prime_powers);
    for pp in prime_powers do
        for k := 1 to Floor(prec/pp) do
            if GCD(k, pp) eq 1 then
                coeffs[pp*k] := coeffs[pp]*coeffs[k];
            end if;
        end for;
    end for;
    return coeffs;
end function;


function qexpCoeffs()
    // To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
    weight := 2;
    raw_aps := [[0, 0, 0, 0, 0, 0], [-1, 1, 0, 0, 0, 0], [0, 0, 0, 0, 1, 0], [0, 0, 0, -1, 0, 0], [-1, 0, 0, 0, 0, 0], [0, 0, 0, 1, 0, 0], [1, -1, 0, 0, -1, 0], [-1, 0, 0, 0, 0, 0], [-1, 0, 1, 1, -1, 0], [0, -1, -1, 1, -1, 1], [-1, 0, 1, 2, -1, 0], [0, -1, -1, -1, 0, 0], [1, 1, 0, 1, -1, 0], [-3, -2, -1, 1, 0, -1], [-2, -2, 0, -2, 0, 0], [2, 2, 0, 0, 0, -1], [-4, 1, -3, -1, 2, -1], [-1, 1, 2, 0, -1, 1], [-3, 2, 3, 2, 1, 1], [1, -3, 0, -2, -2, -1], [0, -2, 0, -2, -2, -1], [1, -3, 0, -2, -1, -1], [-2, -1, -1, -3, 3, 0], [4, -5, 1, -1, -2, 0], [2, 1, 1, -1, 2, 2], [-1, 1, -2, 0, 1, -1], [-1, 2, -1, 1, 0, 1], [-2, -2, 0, 0, 2, 1], [-6, 4, 0, 2, 2, 1], [2, 3, -1, 1, -2, -2], [1, -1, -2, 0, -1, -1], [-3, 1, 2, 1, 3, 2], [-2, 1, -1, -2, 0, 0], [0, -1, -3, -1, -1, 0], [-2, 4, 2, -2, -2, 0], [0, -4, 0, -2, 2, -2], [-2, -2, 0, 0, 1, -2], [-4, -4, 0, 0, 2, -2], [-1, 3, 0, 2, -5, -1], [-2, 5, 3, -1, -3, 0], [-11, 0, -3, -4, -1, -2], [-8, 1, -3, 1, 2, 0], [-5, 6, 3, -1, 1, 0], [-3, 8, -1, 1, 2, -1], [5, 1, 0, -2, 1, 3], [4, 0, -4, -2, 0, 1], [-9, 7, 0, 2, 1, 2], [-4, 3, 1, 3, 0, 2], [-5, 5, 2, 4, 1, 2], [-2, 1, -5, 0, 0, 1], [1, 3, 0, 2, 3, 1], [3, 2, 3, 3, 4, 0], [1, -6, 5, 3, 0, -1], [-1, -2, 3, 3, -3, 3], [-2, -4, 4, -2, 0, -2], [-3, -4, -5, 1, 4, -1], [0, -2, -2, -4, -4, 0], [3, 5, 2, -1, 5, 1], [-4, 0, 8, 2, -2, 2], [3, 2, 3, 1, -6, 1], [4, 2, 0, -1, 4, -3], [-2, -2, 0, 3, 2, 2], [-5, -5, -4, 0, -1, 3], [-14, 10, 4, 2, -2, -1], [-10, 0, 2, 2, -1, 3], [14, -3, 3, 1, -6, 1], [-5, 7, 6, 2, 0, 2], [-8, 0, 8, 1, 0, 1], [5, -3, 4, 0, 3, -1], [-11, 1, -4, -2, 1, -7], [7, -6, -3, -1, 1, 2], [9, 7, -6, 1, -1, -1], [7, -2, 3, -3, 3, -1], [-1, 8, -3, -1, 6, -2], [-3, -10, -1, 0, -3, 3], [7, -10, -5, -4, -5, -4], [-12, 0, -4, -4, 1, 0], [-1, -9, 0, 3, -9, 0], [0, 4, -2, 6, -4, 2], [-4, 1, 5, -1, 1, 0], [-6, 2, 4, -2, -4, 2], [6, 8, -2, 2, -4, 3], [0, -2, 2, 6, -4, 2], [-12, 1, 3, -3, 2, 0], [-3, -1, 6, -2, 3, 3], [-9, -4, 1, -3, 1, 3], [-4, 7, 1, 5, 4, 2], [5, -3, -6, -6, -5, -2], [12, -8, 0, -4, 0, 0], [9, -4, -5, -1, -1, -1], [-3, -2, 1, 3, -1, 1], [16, 2, -6, -1, -2, -3], [-5, 3, 0, 6, 0, -1], [2, -4, -8, 3, 2, -1], [-8, 0, -4, 6, 2, 2], [9, -8, -5, 3, -2, 2], [0, 5, 5, -3, 4, 0], [-4, 5, -5, 7, 2, -2], [10, 0, 2, 0, -2, -1], [-11, 1, 0, -6, -1, -1], [-9, 1, 2, 2, -7, 3], [10, -4, -2, -2, 10, -4], [1, 5, -4, 2, 1, 3], [2, 12, 6, -1, 6, -1], [-22, 4, -4, -1, 2, -1], [-4, 1, 5, 10, -6, 0], [12, -6, 2, 6, 0, 0], [8, 0, 2, 2, -2, 2], [9, 0, 7, 1, 4, -1], [-8, 8, -4, -1, 8, -1], [-5, -1, 0, -2, 13, 3], [-13, 5, -2, 8, 7, 1], [1, -7, 0, 1, -1, -4], [-17, -4, -7, -1, 3, 3], [3, 14, -1, 1, 9, -1], [4, 3, 5, -5, 6, 0], [-5, -6, 3, -5, 5, -5], [-7, 10, 1, -1, -1, -4], [4, -3, -7, -2, 2, 3], [-10, 0, -2, -6, 8, -3], [14, -9, 1, -1, -4, 1], [-1, 5, -6, -7, 5, -2], [9, 0, -5, 5, -6, 0], [-14, -10, 0, 4, -2, -2], [-9, 6, 3, 5, -9, 1], [-2, -8, -6, -6, 2, 2], [22, -13, -3, -2, -4, -1], [7, -4, 1, -1, -3, 6], [-1, -4, -3, -5, 3, -6], [1, -1, -2, 0, -3, 1], [2, 9, 1, 7, 5, 0], [-7, 9, 4, 10, -3, 3], [-20, 1, 3, 5, 8, 2], [5, 2, -3, 1, 0, -1], [4, 4, 6, 10, -4, -1], [-2, -6, -2, -8, 6, -3], [18, -2, -4, -4, 6, 1], [-10, 16, 6, 4, 6, 1], [8, -7, 1, 3, 8, 5], [22, 8, 4, 0, 8, 3], [-9, 1, -2, -2, -7, 2], [9, -1, 2, 0, 7, -5], [1, -6, -3, -1, 1, 6], [-1, 17, -2, 0, -1, -2], [0, -7, 1, -7, -8, -3], [-15, -3, 8, 2, -2, 5], [14, 0, 6, 10, 6, 0], [26, 0, 2, 1, 2, -1], [3, 2, -5, -5, 1, -1], [-17, 5, -10, 3, 7, 2], [7, -2, 3, 5, -6, 2], [-4, 5, 1, -6, 8, -3], [0, -16, 0, -8, -6, 0], [-2, -4, -2, 6, -14, -2], [-2, -2, -4, -2, 0, 5], [-10, 0, 8, -2, 10, 2], [6, 13, -1, -1, -3, -3], [-15, 1, 0, -7, -3, -3], [17, 1, 2, -4, -1, 4], [5, -7, 2, 0, 3, -2], [-19, 8, 3, -1, 1, -1], [19, 7, 6, -2, 3, 3], [7, 5, 8, -2, -7, 1], [-19, 7, 12, -2, -2, 1], [-8, -3, -1, 1, 4, 4], [-7, 22, -3, 4, 5, 0], [5, -1, 10, 9, -3, 4], [-17, 1, -2, 4, 5, 3], [-25, 17, 2, -7, 5, -2], [24, 3, 3, 4, 2, 3], [20, -6, -2, 0, -2, -3], [16, -4, 0, -10, -4, -1], [-11, 2, -3, -1, 4, 3], [-4, 0, -2, -2, -12, 3], [-4, -9, -7, 7, -12, -2], [-10, 4, 6, 8, 3, 4], [5, -3, -10, -9, -1, 2], [-5, 6, 5, 5, -1, -3], [7, -1, 8, -6, -5, -1], [-17, -7, 2, -6, 7, -1], [0, 0, 8, 2, -2, 3], [-20, 2, 6, -4, 2, 1], [0, 5, 17, -1, -2, 2], [-13, 8, 1, -5, 0, -3], [-19, -8, -5, 1, -7, 0], [8, 8, -6, 2, 10, -4], [-15, -5, -8, 6, -1, 0], [-9, -4, -5, -3, -4, 5], [-10, -7, 3, -7, -11, 2], [1, -6, 1, -3, -12, -2], [-8, 9, -5, -1, 4, -6], [2, 6, 2, 3, 6, -1], [-23, 5, 6, 0, 2, 1], [14, -2, 8, 6, -10, -1], [7, -3, 4, -1, -3, 2], [-2, -11, 1, 5, -10, -4], [-24, 4, 2, 2, 2, 5], [-28, 9, 5, 4, 6, 1], [-7, 3, 4, -6, -5, 2], [4, -4, 2, -6, -2, -1], [-3, -13, 6, 1, -3, 2], [-22, -4, -6, -2, -6, -6], [8, -12, -8, 2, 10, -1], [-3, -4, -5, 1, 2, 1], [7, -6, -5, 7, 11, -1], [9, 4, 9, -3, 9, 5], [11, 12, -7, 5, 9, -4], [8, -8, 4, 4, 2, 9], [-13, 5, 4, 8, 7, 4], [-27, -4, 1, -7, 8, 0], [9, -9, 8, 6, -11, 4], [-18, -6, 12, 4, -3, 4], [-13, 4, 1, -7, 3, -3], [-5, -7, 4, -5, 7, 3], [1, -7, 12, 4, -1, 7], [-20, -1, 1, -1, -10, 0], [13, 3, -8, 8, 1, -2], [-3, -9, 0, 0, -7, -7], [-45, -3, -6, -7, -5, 0], [8, 9, -7, 0, 2, 3], [19, -7, -2, -7, 15, -4], [-10, 4, -2, -8, 4, -4], [-12, 1, -5, 1, 10, -6], [7, 2, -1, -5, 1, -4], [-4, -4, 8, 10, -2, 1], [6, -10, -8, 2, -8, -2], [16, -2, 4, -10, 2, -2], [17, 14, 1, -1, 8, 3], [0, -2, -10, -6, -2, -6], [-4, 7, 9, -1, 5, 2], [-26, -2, -8, 4, -1, 2], [12, -8, -8, 4, 10, -3], [6, -18, 4, -4, -4, 2], [-6, -4, -6, -11, 18, 1], [-3, -14, -3, 3, -1, 5], [17, 1, 4, 9, -1, 5], [-18, -3, -9, -4, 14, 3], [28, -10, 2, -4, -2, 0], [19, -16, 1, 7, -9, 3], [11, -2, -1, -6, -5, -2], [-7, -7, 14, 8, 4, -3], [-21, -3, 4, -9, 1, -2], [22, -6, -4, -6, 6, 1], [-34, 5, -5, 5, 8, 3], [2, 6, -6, 10, 0, -2], [-3, 3, 2, 7, -3, -2], [-2, 0, 10, 10, -16, 6], [5, 0, -3, -5, 12, -1], [1, -3, 8, -2, -1, -5], [17, -7, 10, 2, 1, -6], [4, -10, -6, -4, 10, -2], [2, -4, -4, 0, -6, -7], [-21, 10, -9, -5, -1, 0], [-6, 2, 6, 10, 10, 0], [-8, -10, -6, -6, 12, -2], [10, 9, 9, -5, -1, 2], [-19, -4, -9, -13, -6, 1], [-7, 5, -8, -10, -9, -5], [34, 7, 1, 1, 4, -2], [-21, 5, 4, 8, -1, -3], [4, -6, 14, -6, -2, -2], [5, -5, -6, -4, 11, -1], [-23, -19, 4, -6, -3, 3], [13, 0, 7, -3, 10, -2], [-1, 2, 3, 13, 0, 3], [-2, 10, 4, -2, -8, -1], [-6, -11, -1, -7, 8, -7], [8, -14, 2, -6, 7, -1], [-7, -5, -6, -16, -13, -2], [14, -10, -16, -16, 0, -2], [-26, -5, 9, -7, 2, -3], [-21, 11, -2, 6, 10, 2], [25, -11, -12, -9, 5, 3], [-17, 16, 13, 9, -4, -2], [-2, 5, -1, 9, -1, 8], [-7, 6, 1, 7, -17, 6], [3, -22, -1, -15, -3, -5], [9, 2, 5, 15, -8, 6], [-19, -6, 5, -1, 0, -3], [36, -7, -1, -7, -9, -6], [-2, -20, 6, -4, 0, -10], [-7, -6, -11, -7, 3, 6], [-9, -6, -5, -1, 2, -8], [1, 0, 3, -3, -6, 2], [0, -9, -7, -5, 5, -10], [-1, -10, 3, -15, 1, -9], [1, -5, -6, -1, -11, -3], [9, 5, 4, -13, 13, -2], [15, 10, -9, -9, -3, 6], [-12, 5, 1, -1, -7, -6], [-34, 19, -3, -4, 8, -5], [14, -4, -22, -10, -2, -4], [-1, -5, -4, -5, 13, -2], [16, 0, -16, 0, -6, 0], [-5, 6, 11, -5, -10, 1], [0, -14, 2, 8, -6, -4], [-27, 4, -5, 10, -3, -2], [9, 2, -1, -9, -3, 3], [3, 21, -10, -2, -3, 6], [7, -14, 1, -1, 0, 5], [34, -2, 6, 2, 6, 4], [0, 8, 8, -11, 0, 2], [37, -21, -4, 8, -3, 2], [-5, 18, -3, 1, 0, -2], [-21, -16, 1, 1, -15, 1], [-6, 1, -7, -1, 18, 0], [-13, 2, -15, -18, 19, 1], [8, 15, 7, 1, 10, 3], [0, -10, -2, 10, -12, 0], [1, 21, 0, 8, -5, 1], [2, 0, -6, -1, 8, 7], [7, -4, -3, -15, 2, -1], [19, -3, -2, -5, -3, 0], [-9, -1, -10, -8, 8, 7], [-23, -13, 10, 3, 1, -2], [-22, 8, 12, 4, -8, 8], [35, -12, -11, -1, -1, 3], [-5, -5, 0, 10, 1, -1], [15, -2, -9, -5, -16, -4], [-10, 10, -2, -6, -8, 0], [-31, 17, 16, -2, -1, 2], [5, -16, -11, -1, -1, -2], [-3, 17, -6, 4, 11, -2], [-20, 9, 11, 9, 0, -6], [31, 15, -6, 4, -13, 0], [-18, 5, 21, 7, 4, 6], [-17, 2, 5, -6, -5, -3], [-3, 1, 14, 6, -4, 4], [-23, 17, 4, 4, 21, 9], [8, -2, -14, -14, -2, -2], [9, 11, 6, 10, -1, -7], [0, -20, -8, -2, -2, 5], [25, -10, -3, -19, 12, 2], [41, -7, 8, -4, -9, -5], [20, -25, -7, -13, -3, -4], [-5, 2, 7, 11, -1, 7], [-24, -5, 7, -1, 2, 9], [23, -13, 0, 1, 9, 0], [-9, 26, 5, 7, -7, -12], [27, -14, 7, -13, -12, -2], [16, 5, -3, 7, 6, 3], [-24, 14, -10, -14, 3, -1], [17, 7, 18, -9, 3, -3], [-21, 15, 4, 2, -4, -5], [30, 5, 11, 1, 2, -5], [3, 3, 4, 22, -31, 1], [10, 11, 1, 12, -8, 3], [-19, 0, -11, -8, -3, -9], [32, -24, 4, 10, -8, 2], [-39, 14, -1, -1, 13, 3], [7, -17, -8, 2, -5, 1], [-8, -1, 5, 3, -14, 2], [-17, 21, -10, 5, 15, -4], [-12, -2, 2, -4, 14, 0], [32, 10, -2, 11, 2, -1], [10, -5, 1, 7, 3, 0], [3, 4, 13, -15, -1, 0], [23, -6, -3, 11, 0, 1], [10, -12, 4, -2, 10, 3], [13, -18, -15, -2, 1, -2], [-2, 18, 4, -2, -4, -2], [-13, 11, -6, 14, 5, 5], [-29, -7, -2, -8, 4, -11], [-16, -14, -2, -14, -14, 1], [47, 10, -5, 5, 1, -3], [2, 13, -7, 11, 10, -4], [3, 7, -8, 4, 13, -7], [-3, 7, 2, -6, -3, -5], [11, -10, -5, 5, 0, -5], [-15, 2, 5, -5, -11, 5], [29, -5, 16, 3, -19, 1], [1, 5, -6, 14, -7, 6], [29, 2, 9, 15, -6, 2], [-25, 11, 6, 4, -7, 5], [27, -10, 9, 1, -13, -1], [43, -3, 4, -13, 3, 7], [-15, -7, -8, -3, 13, -10], [3, -25, -14, 4, -7, 3], [15, -21, -2, -16, -17, -6], [-14, 8, -20, -4, 8, -6], [-20, -12, -8, -4, -4, 2], [36, 5, -3, 2, 8, 5], [22, -6, 20, -3, -14, 2], [5, -3, 2, -22, -1, -1], [-14, -14, 0, -10, 16, 5], [-4, 1, -13, -15, -16, -2], [-4, -12, -8, -6, 12, -5], [24, 18, 10, -6, -1, 2], [-14, 12, -8, 15, 6, 7], [-29, 3, 0, -6, -10, 1], [-14, 9, 5, 17, -20, 6], [14, 13, 7, 23, 4, 3], [9, -28, -1, 3, -5, 5], [-19, 26, 5, -1, -1, 1], [1, -10, 9, -4, 9, -4], [-1, 2, 7, 9, 12, 3], [18, -20, -2, -6, 6, -2], [12, -18, -16, 4, 2, 0], [-25, 5, 0, 1, 21, 4], [-49, 13, -2, 10, 5, 5], [1, 1, 0, 3, 17, 2], [8, -2, -2, 0, -15, -6], [-2, 12, -6, 16, -4, 4], [-12, -18, 0, -2, -8, -4], [-10, -15, -9, -5, -5, 0], [8, -16, -14, -6, 14, 1], [-15, -29, 10, -7, 1, -2], [1, 3, 0, 12, -7, -3], [12, 10, 6, -4, 18, -1], [23, 0, 5, 11, -13, -1], [-2, -16, 0, -8, -4, 0], [19, 23, 4, 0, 15, 3], [24, 8, 8, -2, -18, -7], [-21, -26, 5, 7, -4, -7], [-17, 21, -16, -6, 5, 6], [-13, -24, -13, -1, -21, -3], [3, 3, 0, 12, -9, 5], [1, -24, 7, 12, -3, -2], [-9, 11, 8, 1, -9, -11], [15, -3, 6, -10, 7, 5], [14, 3, -11, -5, 0, -8], [-12, -8, -6, 0, -8, -1], [-18, 20, 2, -2, -8, 3], [-6, -22, 0, -12, 2, -3], [16, -6, -16, -10, -16, -4], [-18, 9, 7, -7, -8, 1], [-25, 30, 5, 6, 19, 9], [-6, 12, 12, 0, -2, -3], [15, -2, 7, 7, -21, -1], [19, -8, 9, -11, 4, -12]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_3344_a_Hecke(Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_3344_2_a_v();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose lines below.
// The precision argument determines an initial guess on how many Fourier coefficients to use.
// This guess is increased enough to uniquely determine the newform.
function MakeNewformModFrm_3344_2_a_v(:prec:=6)
    chi := MakeCharacter_3344_a();
    f_vec := qexpCoeffs();
    Kf := Universe(f_vec);
    // SetVerbose("ModularForms", true);
    // SetVerbose("ModularSymbols", true);
    S := CuspidalSubspace(ModularForms(chi, 2));
    S := BaseChange(S, Kf);
    maxprec := NextPrime(2999) - 1;
    while true do
        trunc_vec := Vector(Kf, [0] cat [f_vec[i]: i in [1..prec]]);
        B := Basis(S, prec + 1);
        S_basismat := Matrix([AbsEltseq(g): g in B]);
        if Rank(S_basismat) eq Min(NumberOfRows(S_basismat), NumberOfColumns(S_basismat)) then
            S_basismat := ChangeRing(S_basismat,Kf);
            f_lincom := Solution(S_basismat,trunc_vec);
            f := &+[f_lincom[i]*Basis(S)[i] : i in [1..#Basis(S)]];
            return f;
        end if;
        error if prec eq maxprec, "Unable to distinguish newform within newspace";
        prec := Min(Ceiling(1.25 * prec), maxprec);
    end while;
end function;


// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_3344_2_a_v();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function MakeNewformModSym_3344_2_a_v( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_3344_a();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<3,R![8, 23, -4, -21, -3, 4, 1]>,<5,R![-4, -4, 37, 15, -16, -1, 1]>,<7,R![-36, 6, 56, -3, -22, 0, 1]>],Snew);
    return Vf;
end function;