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77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
import numpy as np
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# import math
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# aka x0ref in music code:
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left_corner_highres_boundary = np.array([0.530964, 0.476099, 0.579666])
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# aka x1ref in music code:
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right_corner_highres_boundary = np.array([0.601410, 0.558650, 0.645789])
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# this seems to be the extent of the highres region in units such that it lies in [0...1[
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lxref = right_corner_highres_boundary - left_corner_highres_boundary
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# presumably the centre of the highres region:
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# xc = left_corner_highres_boundary + 0.5 * lxref
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# xc = np.array([math.fmod(xc_i, 1.0) for xc_i in xc])
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# #or equivalently
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xc = (left_corner_highres_boundary + 0.5 * lxref) % 1.0
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print(f"our calculated centre: {xc}")
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# hardcoded because I only want to understand my specific case (read from auriga_6_ics.conf_log.txt):
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shift_unit = 2
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ncoarse = 1 << 7 # == 2 ** 7 (x << y == x * 2 ** y)
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desired_box_centre = np.array([0.5, 0.5, 0.5])
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xshift = (desired_box_centre - xc) * ncoarse / shift_unit + desired_box_centre
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xshift = xshift.astype(int) * shift_unit
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print(f"our music shift: {xshift}")
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adrian_shift = (desired_box_centre - xc * ncoarse).astype(np.int64)
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print(f"adrians shift as noted in our music source: {adrian_shift}")
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oliver_shift = np.array([-6, 0, -12])
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assert (xshift == oliver_shift).all()
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print(
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f"difference between adrians and olivers way to calculate the shift: {adrian_shift - oliver_shift}"
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)
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print(f"our music shift transformed to Mpc coordinates: {xshift / ncoarse * 100}")
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xshift_in_mpc = np.array([-4.6875, 0, -9.375])
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# according to music output:
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highres_region_centre = np.array([0.566187, 0.517375, 0.612728]) * 100
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shifted_highres_centre = highres_region_centre + xshift_in_mpc
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print(
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f"our music shift applied to our calculated highresregion centre: {shifted_highres_centre}"
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)
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# print(f'adrians shift applied to our calculated highresregion centre: {shifted_highres_centre}')
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print(
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f"difference between our calculated centre and the actual centre of the box: {desired_box_centre * 100 - shifted_highres_centre}"
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)
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h_adrian = 0.6777 # according to cosmICweb for the EAGLE sim
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centre_adrian = np.array([56.50153741810241, 49.40761085700951, 49.634393647291695])
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centre_music = np.array([58.25576087992683, 51.34632916228137, 51.68749302578122])
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original_centre_in_adrians_zoom = np.array([4.367988, 1.307087, 7.743252]) / h_adrian
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print(
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f"shift from original to his zooms according to adrian: {original_centre_in_adrians_zoom}"
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)
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print(f"shift from our centre to adrians: {centre_adrian - centre_music}")
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original_centre_from_our_total_shift = xshift_in_mpc + (centre_adrian - centre_music)
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# addition b/c they are in different directions, should cancel each other out
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print(
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f"difference between adrians shift and our corrected shift: {original_centre_in_adrians_zoom + original_centre_from_our_total_shift}"
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)
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