def test__approx_QQ_coef__2(self): ring = PolyRing('x,y,v,w', True) ring.ext_num_field('t^2 - 3') ring.ext_num_field('t^2 + 1') ring.ext_num_field('t^2 + 2/7*a0*a1 + 3/7') ring.ext_num_field('t^2 - 2/7*a0*a1 + 3/7') a0, a1, a2, a3 = ring.root_gens() q2 = sage_QQ(1) / 2 a = 2 * a0 / 3 b = (-a0 * a1 / 3 - q2) * a3 c = (a0 * a1 / 3 - q2) * a2 d = (a1 / 2 - a0 / 3) * a3 e = (-a1 / 2 - a0 / 3) * a2 ci_idx = 5 # index for complex embedding C1 = -(b + c - d - e) C2 = -(b + c + d + e) for lbl, elt in [('a0', a0), ('C1', C1), ('C2', C2)]: print(lbl + ' = ' + str(elt.abs())) for ci in elt.complex_embeddings(): print('\t\t' + str(ci)) s = str(elt.complex_embeddings()[ci_idx]) print(lbl + '.complex_embedding()[' + str(ci_idx) + '] = ' + s) # C1 print('--- C1 ---') out = OrbRing.approx_QQ_coef(C1, ci_idx) print(out) print(sage_n(out)) chk = -sage_QQ(3687885631267691) / 2251799813685248 assert out == chk # C2 print('--- C2 ---') out = OrbRing.approx_QQ_coef(C2, ci_idx) print(out) print(sage_n(out)) chk = sage_QQ(2749869658604311) / 4503599627370496 assert out == chk
def test__approx_QQ_coef__1(self): ring = PolyRing('x,y,z', True).ext_num_field('t^2 - 3') a0 = ring.root_gens()[0] ci_idx = 1 for lbl, elt in [('a0', a0), ('-a0', -a0)]: print(lbl + ' = ' + str(elt.abs())) for ci in elt.complex_embeddings(): print('\t\t' + str(ci)) s = str(elt.complex_embeddings()[ci_idx]) print(lbl + '.complex_embedding()[' + str(ci_idx) + '] = ' + s) print('--- a0 ---') out = OrbRing.approx_QQ_coef(a0, ci_idx) chk = sage_QQ(3900231685776981) / 2251799813685248 print(out) print(sage_n(out)) assert out == chk print('--- (-a0) ---') out = OrbRing.approx_QQ_coef(-a0, ci_idx) print(out) print(sage_n(out)) assert out == -chk
def CH1_cyclide(): ''' Creates povray image of a CH1 cyclide, which is an inversion of a Circular Hyperboloid of 1 sheet. ''' # Construct a trigonometric parametrization by rotating a circle. r, R = 1, 1 c0, s0, c1, s1 = sage_var('c0,s0,c1,s1') x, y, v, w, a0 = sage_var('x,y,v,w,a0') q2 = sage_QQ(1) / 2 MX = sage_matrix([(1, 0, 0), (0, c1, s1), (0, -s1, c1)]) MXc = MX.subs({c1: a0, s1: a0}) # a0=1/sqrt(2)=cos(pi/4)=sin(pi/4) MZ = sage_matrix([(c1, s1, 0), (-s1, c1, 0), (0, 0, 1)]) V = sage_vector([r * c0, 0, r * s0]) V = MXc * V V[0] = V[0] + R pmz_AB_lst = list(MZ * V) OrbTools.p('V =', V) OrbTools.p('pmz_AB_lst =', pmz_AB_lst) for pmz in pmz_AB_lst: OrbTools.p('\t\t', sage_factor(pmz)) # Convert the trigonometric parametrization to a rational parametrization # We convert via the following formulas, # # cos(s) = (y^2-x^2) / (y^2+x^2) # sin(s) = 2*x*y / (y^2+x^2) # y=1; x = arctan( s/2 ) # C0 = (y**2 - x**2) / (y**2 + x**2) S0 = 2 * x * y / (y**2 + x**2) C1 = (w**2 - v**2) / (w**2 + v**2) S1 = 2 * v * w / (w**2 + v**2) den = (y**2 + x**2) * (w**2 + v**2) dct = {c0: C0, s0: S0, c1: C1, s1: S1} pmz_lst = [den] + [(elt.subs(dct) * den).simplify_full() for elt in list(MZ * V)] OrbTools.p('pmz_lst =', pmz_lst) for pmz in pmz_lst: OrbTools.p('\t\t', sage_factor(pmz)) # do a basepoint analysis on the rational parametrization # The True argument is for resetting the number field to QQ! ring = PolyRing('x,y,v,w', True).ext_num_field('t^2-1/2') ls = LinearSeries([str(pmz) for pmz in pmz_lst], ring) OrbTools.p(ls.get_bp_tree()) # construct linear series for families of conics ring = PolyRing( 'x,y,v,w') # construct polynomial ring over new ground field OrbTools.p(ring) x, y, v, w = ring.gens() a0, a1 = ring.root_gens() p1 = ['xv', (0, 2 * a0 * a1)] p2 = ['xv', (0, -2 * a0 * a1)] p3 = ['xv', (a1, 2 * a0 * a1)] p4 = ['xv', (-a1, -2 * a0 * a1)] bpt_1234 = BasePointTree(['xv', 'xw', 'yv', 'yw']) bpt_1234.add(p1[0], p1[1], 1) bpt_1234.add(p2[0], p2[1], 1) bpt_1234.add(p3[0], p3[1], 1) bpt_1234.add(p4[0], p4[1], 1) bpt_12 = BasePointTree(['xv', 'xw', 'yv', 'yw']) bpt_12.add(p1[0], p1[1], 1) bpt_12.add(p2[0], p2[1], 1) bpt_34 = BasePointTree(['xv', 'xw', 'yv', 'yw']) bpt_34.add(p3[0], p3[1], 1) bpt_34.add(p4[0], p4[1], 1) ls_22 = LinearSeries.get([2, 2], bpt_1234) # |2(l1+l2)-e1-e2-e3-e4| ls_21 = LinearSeries.get([2, 1], bpt_1234) ls_12 = LinearSeries.get([1, 2], bpt_1234) ls_11a = LinearSeries.get([1, 1], bpt_12) ls_11b = LinearSeries.get([1, 1], bpt_34) OrbTools.p('linear series 22 =\n', ls_22) OrbTools.p('linear series 21 =\n', ls_21) OrbTools.p('linear series 12 =\n', ls_12) OrbTools.p('linear series 11a =\n', ls_11a) OrbTools.p('linear series 11b =\n', ls_11b) # compute reparametrization from the linear series of families ring = PolyRing( 'x,y,v,w,c0,s0,c1,s1') # construct polynomial ring with new generators OrbTools.p(ring) x, y, v, w, c0, s0, c1, s1 = ring.gens() a0, a1 = ring.root_gens() pmz_AB_lst = [1] + ring.coerce(pmz_AB_lst) pmz_lst = ring.coerce(pmz_lst) X = 1 - s0 Y = c0 V = 1 - s1 W = c1 CB_dct = { x: X, y: Y, v: W * X - 2 * a0 * V * Y, w: V * X + 2 * a0 * W * Y } pmz_CB_lst = [pmz.subs(CB_dct) for pmz in pmz_lst] # CB 11b # output OrbTools.p('pmz_AB_lst =\n', pmz_AB_lst) OrbTools.p('pmz_CB_lst =\n', pmz_CB_lst) # approximate by map defined over rational numbers ci_idx = 0 # index defining the complex embedding OrbTools.p('complex embeddings =') for i in range(len(a0.complex_embeddings())): a0q = OrbRing.approx_QQ_coef(a0, i) OrbTools.p('\t\t' + str(i) + ' =', a0q, sage_n(a0q)) pmz_AB_lst = OrbRing.approx_QQ_pol_lst(pmz_AB_lst, ci_idx) pmz_CB_lst = OrbRing.approx_QQ_pol_lst(pmz_CB_lst, ci_idx) # mathematica input ms = '' for pmz, AB in [(pmz_lst, 'ZZ'), (pmz_AB_lst, 'AB'), (pmz_CB_lst, 'CB')]: s = 'pmz' + AB + '=' + str(pmz) + ';' s = s.replace('[', '{').replace(']', '}') ms += '\n' + s OrbTools.p('Mathematica input =', ms) # PovInput ring cyclide # pin = PovInput() pin.path = './' + get_time_str() + '_CH1_cyclide/' pin.fname = 'orb' pin.scale = 1 pin.cam_dct['location'] = (0, -5, 0) pin.cam_dct['lookat'] = (0, 0, 0) pin.cam_dct['rotate'] = (20, 0, 0) pin.shadow = True pin.light_lst = [(1, 0, 0), (0, 1, 0), (0, 0, 1), (-1, 0, 0), (0, -1, 0), (0, 0, -1), (10, 0, 0), (0, 10, 0), (0, 0, 10), (-10, 0, 0), (0, -10, 0), (0, 0, -10)] pin.axes_dct['show'] = False pin.axes_dct['len'] = 1.2 pin.height = 400 pin.width = 800 pin.quality = 11 pin.ani_delay = 10 pin.impl = None pin.pmz_dct['A'] = (pmz_AB_lst, 0) pin.pmz_dct['B'] = (pmz_AB_lst, 1) pin.pmz_dct['C'] = (pmz_CB_lst, 0) pin.pmz_dct['FA'] = (pmz_AB_lst, 0) pin.pmz_dct['FB'] = (pmz_AB_lst, 1) pin.pmz_dct['FC'] = (pmz_CB_lst, 0) v0_lst = [(sage_QQ(i) / 180) * sage_pi for i in range(0, 360, 10)] v1_lst_A = [(sage_QQ(i) / 180) * sage_pi for i in range(180, 360, 10)] v1_lst_B = [(sage_QQ(i) / 180) * sage_pi for i in range(0, 180, 10)] v1_lst_C = [(sage_QQ(i) / 180) * sage_pi for i in range(0, 180, 10)] v1_lst_FA = [(sage_QQ(i) / 180) * sage_pi for i in range(180, 360, 2)] v1_lst_FB = [(sage_QQ(i) / 180) * sage_pi for i in range(0, 180, 2)] v1_lst_FC = [(sage_QQ(i) / 180) * sage_pi for i in range(0, 180, 2)] prec = 50 pin.curve_dct['A'] = { 'step0': v0_lst, 'step1': v1_lst_A, 'prec': prec, 'width': 0.03 } pin.curve_dct['B'] = { 'step0': v0_lst, 'step1': v1_lst_B, 'prec': prec, 'width': 0.03 } pin.curve_dct['C'] = { 'step0': v0_lst, 'step1': v1_lst_C, 'prec': prec, 'width': 0.03 } pin.curve_dct['FA'] = { 'step0': v0_lst, 'step1': v1_lst_FA, 'prec': prec, 'width': 0.02 } pin.curve_dct['FB'] = { 'step0': v0_lst, 'step1': v1_lst_FB, 'prec': prec, 'width': 0.02 } pin.curve_dct['FC'] = { 'step0': v0_lst, 'step1': v1_lst_FC, 'prec': prec, 'width': 0.02 } col_A = (0.6, 0.4, 0.1, 0.0) col_B = (0.1, 0.15, 0.0, 0.0) col_C = (0.2, 0.3, 0.2, 0.0) colFF = (0.1, 0.1, 0.1, 0.0) pin.text_dct['A'] = [True, col_A, 'phong 0.2 phong_size 5'] pin.text_dct['B'] = [True, col_B, 'phong 0.2 phong_size 5'] pin.text_dct['C'] = [True, col_C, 'phong 0.2 phong_size 5'] pin.text_dct['FA'] = [True, colFF, 'phong 0.2 phong_size 5'] pin.text_dct['FB'] = [True, colFF, 'phong 0.2 phong_size 5'] pin.text_dct['FC'] = [True, colFF, 'phong 0.2 phong_size 5'] # raytrace image/animation create_pov(pin, ['A', 'B', 'C']) create_pov(pin, ['A', 'B', 'C', 'FA', 'FB', 'FC']) create_pov(pin, ['A', 'B', 'FA', 'FB']) create_pov(pin, ['B', 'C', 'FA', 'FB'])