
// Make newform 3344.2.a.x in Magma, downloaded from the LMFDB on 19 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_x();".
// 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_x();".
// 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 := [27, -60, 16, 28, -12, -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], [-5, 0, 1, 0, 0, 0], [-3, 28, -5, -12, 1, 1], [48, -43, -25, 15, 2, -1], [42, -50, -20, 24, 1, -2]];
    Rf_basisdens := [1, 1, 1, 3, 3, 3];
    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], [0, 1, 0, 0, 0, 0], [0, 0, 0, 0, 0, -1], [0, 0, 0, 0, -1, 0], [-1, 0, 0, 0, 0, 0], [0, 0, 0, 1, 0, 0], [3, -2, 0, 0, -1, -1], [-1, 0, 0, 0, 0, 0], [0, 2, 1, 0, 0, 1], [0, 1, -1, 0, 0, 1], [4, 0, 1, -1, 0, -1], [3, 2, 1, 0, 1, 2], [-1, 2, 0, 1, -1, -1], [-2, 2, 1, 0, 0, 0], [-2, 0, 0, -2, 0, 0], [2, -2, -2, 0, 0, 0], [3, -2, 1, 0, 1, 0], [3, 0, 2, -2, 1, -1], [2, 0, -1, 1, -2, 1], [6, -3, 0, 0, 0, 0], [4, -2, -2, 0, 0, 2], [-1, 4, 2, 0, 1, 3], [3, 0, 1, -2, 1, -1], [-3, 0, -1, 0, 1, -2], [-7, 0, 1, 0, -1, 0], [-1, 0, 0, 0, -1, -3], [3, -1, -1, 0, 1, 0], [-2, -2, -2, 2, 0, 2], [6, 2, 0, 2, 0, 2], [-3, 0, 1, -2, 1, 2], [-1, 2, -2, 2, -1, -1], [-1, 2, 0, -2, 2, 1], [-5, -2, -3, 0, 0, 0], [-5, -2, 1, 0, 1, 1], [-8, 0, 0, 2, 2, 2], [4, -2, -4, 0, 0, 0], [-8, 2, -2, 2, 0, 3], [-4, -2, 0, 2, -2, 0], [9, -2, 2, -2, -1, -3], [2, -5, 1, 0, 0, -1], [6, -4, 1, -1, -2, -1], [11, -4, 1, -2, -1, 0], [8, -2, 1, -2, 2, 1], [1, -1, 1, -2, 1, -2], [-3, 0, -2, -2, 1, -1], [0, -4, -2, 0, 2, -2], [1, 0, 0, -2, -1, 3], [1, -2, -3, 0, -1, 2], [-3, 4, 0, -2, 1, 1], [1, 0, 1, 0, -2, -2], [1, -4, 2, -2, -1, 1], [-6, -8, 1, -2, 0, -2], [3, -3, -3, -2, -3, -2], [6, -2, -3, -2, -2, -3], [-10, -4, 2, -2, 0, 0], [-4, 0, 1, 2, 2, 0], [8, 0, -4, 0, 0, -2], [3, 0, 0, 2, 0, 1], [14, 4, 4, 0, -2, 0], [1, -3, 1, 2, 1, 2], [-6, -2, 0, 4, -3, -2], [-2, 0, -2, -1, -2, -2], [3, -2, 2, 2, -3, -5], [2, -4, -4, 2, 2, 0], [12, 0, 0, 4, 0, -1], [-5, 0, 1, -2, -1, 2], [10, 5, 4, 0, 0, 4], [4, 0, 0, -1, 0, -2], [-3, 6, 0, 2, 1, -1], [-7, 4, 2, 0, 3, 3], [6, 0, -3, -2, -4, -1], [-3, 0, 4, 2, 0, -1], [8, 2, 1, -4, 2, 1], [11, 1, 3, -2, 1, 0], [0, 4, 1, -1, 4, -1], [4, 4, 1, 3, -4, -3], [4, 10, -2, 2, 0, 5], [-11, 2, 0, 2, 4, 3], [0, -4, 0, 2, 2, 2], [6, 3, 3, -4, 2, -1], [-4, 10, 4, 0, 0, 0], [6, -6, -2, -2, 2, 2], [6, -4, 0, 0, -2, 0], [15, -8, -1, -2, -3, -2], [7, 2, 4, 4, -1, -1], [-2, 6, 3, 0, 4, 3], [-13, -2, -3, 2, 5, 4], [7, 2, -4, 2, -1, 1], [-10, -2, 0, 2, -4, 0], [2, -8, 1, -2, -2, -5], [-6, 6, -1, 2, 2, -1], [-10, -4, -2, 0, 5, 0], [0, 5, -2, 0, -4, -2], [-10, 0, 2, 0, -3, 4], [0, 0, -2, 0, 4, 6], [0, 2, -1, 0, 2, 2], [7, 0, 5, -4, 3, -2], [-7, -6, -3, -2, 1, -6], [0, -4, 0, 2, -2, 4], [13, -8, 2, -4, 3, 5], [-5, 4, -4, 0, 3, 5], [-6, 4, 2, 0, 0, -4], [-13, 2, 0, 0, 3, 3], [12, 0, 0, 3, 0, -4], [-4, -10, 0, 0, -1, 0], [-17, 4, -3, 0, -2, 4], [14, 0, 4, 0, 4, 0], [-10, -2, 2, 4, -2, -4], [-5, 1, 1, 0, -1, 0], [-4, 4, 2, 1, 8, 2], [27, -8, -4, 0, -1, -1], [7, -2, 0, 0, 1, 1], [15, 4, 0, 2, 0, 1], [-12, -4, 3, 2, -2, -3], [-8, 4, -1, 0, -6, -7], [1, -8, -1, 0, 1, -2], [-6, 12, -1, 2, 4, 3], [4, 8, 3, 0, 2, 9], [-9, 4, 3, 0, -4, 2], [-8, 4, -2, 2, 0, 6], [9, -8, -3, 6, -3, -4], [-1, 6, 0, 7, -1, 1], [-7, -1, 1, -2, -5, 0], [12, 4, 0, 0, 2, 4], [-4, 0, -5, 4, 2, -1], [8, 4, 6, 2, 2, 2], [7, 2, 5, 0, 4, 0], [4, 2, -1, 4, -4, 3], [10, 10, -3, 4, -2, 3], [-1, -10, -8, 0, 3, -3], [-7, -4, 3, 2, 3, 1], [5, -6, 6, -4, 3, -7], [11, 2, 3, 0, 5, 6], [0, 0, 5, -2, 4, -2], [-6, -4, -4, -2, 4, 2], [18, 6, 4, 2, -2, 4], [0, -2, 0, 0, 2, 0], [-6, 0, -2, 2, 2, 6], [11, -8, 3, -2, -3, -8], [-6, -4, -4, 2, 0, 2], [-3, 6, -2, 0, -5, -5], [-7, -4, 4, 2, 3, 3], [8, 2, 1, 2, 2, 5], [-11, -4, 6, -2, 1, -1], [11, -2, 1, -2, 9, 6], [18, -3, 2, 0, -2, -4], [0, -12, -2, 2, -2, -6], [-8, -4, -2, 1, 0, 4], [0, 8, 5, -6, 4, 1], [9, -2, -2, -5, -3, 1], [9, -3, 5, -2, -5, -4], [17, -2, 3, -4, 2, 4], [-6, 10, 2, -4, 0, 2], [14, -2, -4, 0, 2, -2], [-8, 0, -8, 4, -2, 0], [-8, -4, 0, 4, -2, 4], [17, -6, -3, 0, -5, 3], [5, 2, 2, -2, 0, -3], [-15, 2, 2, 0, 3, 7], [1, 0, 6, -4, -1, 1], [-6, -6, 1, -8, 4, -1], [-9, 8, 6, -4, 5, -1], [-17, -6, -4, 6, -5, -3], [12, -1, -2, 0, 6, -4], [-9, 6, 1, -4, 3, 2], [-2, 0, -1, 5, -6, -3], [3, -2, 2, 1, 7, 3], [-17, 8, -8, 2, -3, 5], [7, 2, -2, 3, -1, 1], [7, -8, 1, 0, -4, 0], [-14, -10, 0, 0, -4, -2], [-2, 4, -4, 8, 0, 0], [14, -12, 3, -2, -8, -4], [-14, -2, 6, -2, 6, -4], [15, -6, -3, 4, 1, -4], [-4, -2, -2, -2, -4, -9], [-23, 0, -6, 6, -6, 1], [10, 0, 1, 6, 0, -1], [15, 6, 0, 0, 5, 3], [5, 4, 2, -4, 1, 1], [10, -12, 0, -6, -6, -6], [-8, 4, -6, 2, 4, 6], [3, 0, -5, 2, -5, -4], [23, 3, 5, -2, -7, -10], [-2, -10, -7, 0, 6, 5], [12, -8, 6, -4, 6, 4], [3, -12, 4, -4, 1, 5], [5, 1, -1, 0, 1, 8], [18, 5, 3, 0, -4, 5], [-18, 4, -1, -6, 0, 2], [-23, 4, -5, 2, 1, 6], [-26, -2, -2, 4, -5, -4], [-4, 7, 2, 0, 4, 2], [-2, 8, -6, 0, 2, 0], [13, 0, -4, -6, -4, -13], [3, -2, 1, -2, 3, 12], [8, -14, -8, 2, 2, 0], [5, 6, -3, -4, 4, 10], [-27, 0, 2, -2, -3, 3], [-14, 0, -2, 0, -6, -4], [5, 6, 2, 7, 5, 5], [14, -16, -10, 2, -2, -4], [8, 2, 4, -4, 4, -6], [-5, -1, -1, -6, 1, 0], [12, -10, -9, 2, 2, -3], [30, 4, -3, 2, 0, 7], [20, 8, -5, 0, -2, 5], [-6, 8, 4, 0, 6, -2], [29, -8, -4, 2, -3, -3], [-1, 1, 1, 8, 3, 0], [-1, 0, 0, 0, 3, -9], [2, -6, -2, -6, -2, 1], [6, 4, -1, 4, -2, -5], [3, -10, 0, -3, -5, -9], [-3, -8, 4, -8, 3, 5], [15, -16, 1, 0, 1, -8], [-11, 14, 0, 2, 5, 3], [15, 0, -4, 4, -3, 9], [17, -2, -4, -3, -7, -3], [1, -2, 5, 4, 0, 6], [-5, 6, 4, -1, -1, -1], [30, 14, 0, 2, -2, 4], [-17, -8, 1, 6, -7, -2], [6, -4, -7, 4, -6, -3], [4, 8, 2, 4, -4, -8], [26, -2, 4, -6, -8, -10], [12, 8, 0, 0, 4, -2], [7, 13, 3, 0, 3, 14], [-12, -12, -6, -4, -6, -8], [-5, -4, -1, -2, 5, -11], [2, 2, -2, -2, 2, -1], [18, -16, -2, 4, -2, -6], [12, -10, 0, 2, -2, -8], [-16, 16, -6, 1, 0, 16], [-2, 6, 13, 4, 4, 3], [-9, -8, 2, -2, -4, -5], [-3, 16, -5, 4, -2, 8], [16, 0, -2, 4, -4, 12], [6, -6, -5, 2, 0, -3], [-2, -4, -3, 1, 10, -1], [-14, 13, 2, -4, 2, 12], [21, -12, 0, 2, 0, -5], [2, 8, 8, 4, -4, -4], [1, -10, 3, -4, 1, -8], [-8, 10, 6, -2, 2, -2], [-37, -2, -2, 2, -2, -9], [16, -16, -10, -2, -2, 0], [15, 3, 1, -4, 3, -4], [-23, 4, 2, 4, 5, -3], [-33, -2, -6, -2, 7, 3], [-8, -6, -2, -8, 6, 2], [8, -2, 6, 4, 0, 4], [-32, 8, -5, 4, 0, 13], [32, 4, 4, -2, 0, 6], [-32, 14, -2, 4, 0, 0], [1, 2, -7, -4, 7, 5], [22, 0, -1, 2, -2, -12], [31, -8, -6, 4, 1, 3], [5, -10, -7, 6, 1, 0], [3, -2, -2, -2, 1, -17], [-4, -4, -4, 0, 6, 0], [-1, -10, -2, -2, -5, 3], [-11, -6, -8, 4, -3, -7], [7, 11, -1, 2, -1, -2], [18, 4, 5, -2, 2, 0], [12, 8, -4, -8, 6, 0], [7, -14, -5, -4, 3, 2], [-22, 10, 2, 2, 6, -7], [5, -6, 0, 2, -7, -5], [-22, 6, 2, -6, 6, 2], [-17, 0, 5, 2, 1, 0], [26, -13, -8, -4, -4, -4], [19, 0, 0, 2, 0, -11], [12, -10, -3, 4, 2, 4], [-24, 11, 7, 0, -2, 3], [12, -14, -5, -4, -2, -9], [54, 2, 5, -4, 0, -3], [-23, -11, -5, -2, -1, -2], [13, -3, 3, -2, 1, 8], [9, 8, 5, 6, -1, 3], [4, -10, 0, 4, 4, -2], [36, 2, 1, 2, 0, 7], [22, 8, 9, 2, 0, 4], [7, -1, -9, 6, -9, 6], [31, -6, -3, 0, -3, -9], [30, -18, 3, -2, -4, -11], [23, 4, 2, 10, 2, 3], [15, -10, 0, 7, -9, -3], [-2, 10, 3, 0, -4, -5], [4, 3, -7, -4, 6, 1], [5, 2, 5, 8, -4, -6], [20, -20, -2, -2, 8, 10], [-7, 2, 10, 3, 5, 1], [10, 6, 6, -8, 6, 10], [-9, 11, 1, 10, -3, -10], [-28, 2, -6, -2, -4, 2], [12, -16, 5, -3, 4, -11], [28, 4, 7, -2, -2, -1], [-3, 8, 10, -2, -1, 1], [-2, -8, -3, 2, 0, -10], [-14, 10, 2, 0, 8, 10], [20, 4, -2, -7, 4, -4], [1, 14, 0, 2, 5, 7], [-13, -13, -9, 0, -3, -8], [-14, 8, -1, 0, -4, 1], [17, -10, 3, -4, -1, 2], [14, 8, -1, -1, 2, 7], [-15, 12, -5, 4, -7, 2], [-4, 12, -6, 6, 2, -2], [-5, -16, 6, -2, -1, -5], [14, -14, 0, 0, 1, -10], [-10, -2, 3, -8, 6, 2], [11, -10, -6, 1, -1, -3], [-8, -17, -8, 0, 10, 10], [-31, 0, -4, 2, 4, 3], [26, 2, 4, -10, 4, -6], [10, -2, -5, 0, -10, 1], [-37, 4, -2, -6, -3, 3], [12, -10, 3, 0, 8, -6], [28, -10, 2, -4, 4, -6], [-1, -2, 6, 0, -3, 3], [18, 0, -11, -6, 0, 3], [-7, -8, -6, -4, -1, -11], [-9, -6, 3, -4, -3, 2], [17, -8, -4, -4, -9, -5], [-5, -2, 9, -8, 9, -10], [-18, 0, -1, 7, 2, 7], [0, 7, -8, 4, 2, 2], [13, 6, 4, 0, -3, -11], [-24, -4, 0, -2, 0, -4], [11, 4, 8, -6, -3, -7], [22, -10, 6, 0, -4, -12], [14, -2, -7, 4, 0, -4], [-47, -2, -12, 6, -3, -1], [-9, 6, -3, -4, -3, -5], [-32, -2, -5, 6, -4, 1], [3, 0, -13, 2, -3, 0], [-3, -18, 2, 1, -3, -11], [30, 16, 1, 2, 0, 3], [10, -6, -9, 0, 0, 4], [9, -6, 7, -6, -3, 2], [4, 6, 2, 6, -4, -1], [29, 6, 2, -5, 5, 1], [30, -7, 8, 0, 4, -8], [41, -10, -1, 2, 11, -2], [21, 0, -4, 8, -1, 1], [37, 0, 3, -4, 0, 4], [-12, 24, -1, 1, 8, 13], [-32, 10, -6, -4, 4, 10], [16, 8, -1, 14, -2, -1], [7, 4, 2, -2, 5, -7], [-23, -14, -5, 0, -9, -8], [-13, 12, -4, -2, -10, -7], [2, 2, 4, -8, 6, -4], [18, -4, -6, -1, -6, 8], [16, 7, 3, 4, -4, -3], [6, 0, 1, -4, 0, -7], [-6, 4, 13, -2, 0, -2], [-12, 4, 4, 4, 0, 10], [-12, 0, -7, 11, -4, 3], [6, -12, 2, 0, 8, -4], [-17, -14, -8, 0, 5, 7], [14, 9, -2, 0, 4, -2], [-32, -10, -2, 4, 6, 4], [-8, -6, -3, 0, 0, 3], [-3, -10, 3, 0, -7, -10], [-3, -6, -4, 2, -1, 7], [11, 8, -2, 4, -3, 3], [5, -1, -5, -2, -1, -6], [-10, 20, -1, -2, 6, 19], [9, -6, 0, 1, -11, -11], [-21, -6, 2, -10, -1, -1], [19, -1, -9, -6, 5, 16], [-15, 6, 2, -6, -3, -15], [-16, 12, -7, 2, 2, 5], [11, -10, 6, -3, 3, 7], [5, -18, -4, -10, -8, -5], [17, -18, 0, -6, -3, -15], [17, 10, -4, 8, -3, 9], [2, 18, -4, 6, -8, 6], [36, 0, 8, -6, -8, -16], [-49, 6, -5, 0, 4, 14], [4, -10, 14, -4, 9, -6], [27, 6, 4, 10, 1, -1], [-12, 18, -4, 12, 0, -2], [9, -10, 11, -8, 7, -4], [4, 6, -4, 4, 0, 0], [6, 8, 6, 0, 2, 17], [-20, 10, -4, 0, -9, 0], [44, 11, 2, 4, 0, 2], [-43, 8, 9, -4, 11, -10], [7, 18, -3, -8, 9, 10], [20, 0, -3, 4, 4, 5], [8, -22, -3, -8, -2, -7], [26, 0, -15, 5, -6, 5], [-33, 7, -3, 2, 7, 8], [-14, 20, -4, 0, 8, 12], [-2, -4, 6, 2, 0, -16], [-57, 10, -4, -3, -1, 11], [-9, -4, 6, -2, 3, -7], [-5, -14, -10, 7, -5, -11], [-14, 0, 8, -12, 2, 7], [-32, 0, 8, -4, 2, -12], [18, 6, 12, -6, -6, 0], [-16, -7, -3, 0, 6, -11], [18, -4, -6, -4, -2, 4], [19, 6, -6, -2, -2, 7], [-9, 8, 12, 0, -11, 1], [2, 0, 10, -4, 4, -4], [-28, -2, -1, -4, -6, -9], [42, -2, 4, -6, 8, 2], [-27, -16, -6, 2, 5, 3], [-6, 12, 4, 0, -4, -10], [-2, 2, -1, -8, 4, -8], [-23, 28, 6, -4, 5, 7], [28, 4, -5, -6, 2, 3], [7, -10, -4, 2, 1, -13], [6, 0, -3, -9, -10, -5], [-25, 6, -10, 2, -14, -1], [23, -2, 0, -4, 5, 1], [11, 10, -5, 6, -3, -6], [14, -2, 2, 14, -8, -8], [-10, 8, 4, 8, 12, 12], [16, 16, -10, 2, 2, -6], [30, -20, -2, -4, -6, -18], [-31, 12, 5, -6, -9, 6], [-2, 8, 5, -5, 14, -5], [22, -4, -6, -2, -8, -8], [-16, 6, 9, 0, 4, 9], [0, -20, -1, 2, -2, -2]];
    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_x();".
// 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_x(: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_x();".
// 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_x( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_3344_a();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<3,R![27, -60, 16, 28, -12, -2, 1]>,<5,R![-543, 48, 228, -6, -28, 0, 1]>,<7,R![-1738, 760, 547, -78, -43, 2, 1]>],Snew);
    return Vf;
end function;