
// Make newform 4830.2.a.r in Magma, downloaded from the LMFDB on 25 April 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_4830_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_4830_2_a_r();".
// 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_4830_2_a_r();".
// 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
        Kf := Rationals();
    end if;
    return [Kf!elt[1] : elt in input];
end function;


// To make the character of type GrpDrchElt, type "MakeCharacter_4830_a();"
function MakeCharacter_4830_a()
    N := 4830;
    order := 1;
    char_gens := [3221, 967, 2761, 1891];
    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_4830_a_Hecke(Kf)
    return MakeCharacter_4830_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 := [[1], [-1], [-1], [-1], [-2], [0], [2], [0], [1], [2], [-6], [4], [6], [-4], [-12], [0], [-6], [-2], [8], [-8], [0], [-10], [-4], [10], [-18], [-18], [-8], [0], [-10], [12], [0], [18], [-8], [14], [-2], [-12], [-10], [-4], [-12], [-24], [-20], [-6], [18], [22], [18], [-20], [-8], [20], [12], [-2], [-26], [16], [-2], [-24], [8], [28], [-18], [-22], [2], [14], [-28], [2], [-20], [22], [26], [2], [-4], [20], [-20], [-6], [-4], [6], [-8], [-4], [-14], [0], [-2], [20], [18], [2], [-20], [-6], [30], [6], [-34], [28], [-10], [24], [-10], [24], [-12], [-28], [-24], [12], [8], [16], [-38], [26], [28], [2], [12], [32], [-28], [18], [-6], [-16], [44], [-12], [-12], [14], [-32], [-16], [4], [-24], [14], [22], [-28], [48], [34], [-6], [42], [6], [38], [-36], [22], [-30], [10], [18], [32], [-6], [-48], [40], [46], [-8], [26], [-18], [6], [20], [-22], [18], [-2], [-10], [-16], [56], [-50], [-44], [20], [36], [-18], [-24], [-2], [-2], [12], [24], [-12], [54], [10], [-30], [-42], [-34], [-52], [8], [-8], [32], [-12], [-48], [-20], [-8], [22], [36], [-26], [14], [-6], [-8], [26], [6], [8], [38], [48], [30], [-8], [48], [38], [48], [-16], [30], [-58], [28], [-22], [54], [8], [-28], [-30], [-22], [16], [-22], [-18], [16], [6], [36], [-38], [-10], [16], [14], [40], [-48], [-4], [-12], [26], [-70], [54], [-14], [-32], [-28], [6], [42], [0], [2], [12], [34], [-50], [-48], [-18], [-52], [32], [-22], [66], [-48], [8], [-32], [-26], [60], [-34], [50], [4], [-72], [22], [-36], [-40], [-42], [-12], [-6], [-60], [34], [20], [34], [-20], [0], [-62], [52], [60], [18], [-12], [42], [-24], [24], [-50], [-36], [-44], [0], [-16], [32], [-38], [14], [44], [-76], [-30], [-38], [8], [-42], [14], [-16], [-46], [10], [-12], [-8], [36], [-14], [-18], [76], [76], [-22], [-32], [-58], [56], [0], [-4], [-24], [-82], [2], [42], [20], [-70], [40], [74], [26], [-8], [-72], [6], [8], [46], [-52], [-50], [-20], [10], [54], [-84], [78], [26], [-34], [32], [18], [34], [-44], [-48], [-10], [-42], [60], [-14], [-34], [-20], [-36], [-54], [-56], [12], [-50], [-18], [84], [36], [-48], [18], [90], [70], [24], [-74], [-64], [54], [74], [-18], [-32], [22], [32], [-66], [82], [-8], [12], [18], [4], [12], [-70], [2], [-2], [18], [32], [50], [-52], [12], [12], [14], [-80], [-8], [18], [48], [-46], [20], [82], [-44], [-76], [-34], [-40], [50], [-72], [-42], [-40], [38], [-58], [-58], [70], [50], [92], [-14], [84], [24], [-38], [0], [48], [24], [92], [4], [56], [50], [-8], [12], [-8], [-66], [0], [-100], [-90], [-18], [-18], [14], [-58], [0], [6], [-10], [-10], [-12], [-50], [84], [-50], [-56], [-78], [56], [10], [-68], [22], [16], [52], [-50], [40], [-106], [-14], [96], [-26], [-64], [-4], [28], [6], [82], [34]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_4830_a_Hecke(Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_4830_2_a_r();".
// 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_4830_2_a_r(:prec:=1)
    chi := MakeCharacter_4830_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_4830_2_a_r();".
// 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_4830_2_a_r( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_4830_a();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<11,R![2, 1]>,<13,R![0, 1]>,<17,R![-2, 1]>,<19,R![0, 1]>,<29,R![-2, 1]>],Snew);
    return Vf;
end function;