{"id":8949,"date":"2022-09-16T10:05:44","date_gmt":"2022-09-16T04:35:44","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-converting-python-script-to-c-closed\/"},"modified":"2022-09-16T10:05:44","modified_gmt":"2022-09-16T04:35:44","slug":"solved-converting-python-script-to-c-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-converting-python-script-to-c-closed\/","title":{"rendered":"[Solved] Converting Python Script to C++ [closed]"},"content":{"rendered":"

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When the class calls itself like that it’s the __call__ method in the class that it is calling, like operator(). __init__ is like a constructor and is called when the class is instantiated, so everything in init is available by the time the class gets to __call__.<\/p>\n

class ReducedMomentum:\n    # here is where an instance of the object calls itself\n    def __call__(self, kinetic_energy):\n        \"\"\"Example\n           reduced_momentum = ReducedMomentum(5)\n           reduction = reduced_momentum(5)\n        \"\"\"\n        return math.sqrt(kinetic_energy * (kinetic_energy + 2 * self.mass)) \/ self.mass\n<\/code><\/pre>\n
So for your Ktilde class, for example<\/p>\n
class Ktilde:\n    def __init__(self, alpha_1, tritium_mass, electron_mass_eV):\n        \"\"\"Constructor needing above arguments\n           alpha_1: float?\n           tritium_mass: float?\n           electron_mass_eV: float?\n\n           Example:\n           k_tilde = Ktilde(1., 1., 1.)  # initialize with params\n           some_spectator_mass = 2.  # some other relevant numbers\n           some_electron_KE = 302.1\n           calculation = k_tilde(some_spectator_mass, some_electron_KE)  # uses the __call__ method in this class\n        \"\"\"\n        self.alpha_1 = alpha_1\n        self.mass_fraction = MassFraction(tritium_mass, electron_mass_eV \/ ATOMIC_MASS)\n        self.reduced_momentum = ReducedMomentum(electron_mass_eV)\n\n    def __call__(self, spectator_mass, electron_kinetic_energy):\n        return self.alpha_1 * self.mass_fraction(spectator_mass) * self.reduced_momentum(electron_kinetic_energy)\n<\/code><\/pre>\n
So this does<\/p>\n
    ktilde = Ktilde(alpha_1, spectator_masses, electron_mass)  # ktilde instance\n    mass_spectator = parse_spectator_mass(args, parser)  # some function to get mass of spectator\n    ktilde_value = ktilde(mass_spectator, args.energy)  # uses __call__ method of KTilde, args is some object (maybe from argparser) that has an energy attribute\n    print('{:.4f}'.format(ktilde_value))\n<\/code><\/pre>\n<\/p><\/div>\n
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solved Converting Python Script to C++ [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] When the class calls itself like that it’s the __call__ method in the class that it is calling, like operator(). __init__ is like a constructor and is called when the class is instantiated, so everything in init is available by the time the class gets to __call__. class ReducedMomentum: # here is where an … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,349],"class_list":["post-8949","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-python"],"yoast_head":"\n[Solved] Converting Python Script to C++ [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-converting-python-script-to-c-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Converting Python Script to C++ [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] When the class calls itself like that it’s the __call__ method in the class that it is calling, like operator(). __init__ is like a constructor and is called when the class is instantiated, so everything in init is available by the time the class gets to __call__. class ReducedMomentum: # here is where an ... 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