37 lines
1003 B
Julia
37 lines
1003 B
Julia
module Utils
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##
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# Copyright © 2015 Dynare Team
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#
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# This file is part of Dynare.
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#
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# Dynare is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Dynare is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Dynare. If not, see <http://www.gnu.org/licenses/>.
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##
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export get_power_deriv
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function get_power_deriv(x::Float64, p::Real, k::Int)
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if abs(x)<1e-12 && p>0 && k>p && typeof(p)==Int
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dxp = .0
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else
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dxp = x^(p-k)
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for i = 0:k-1
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dxp *= p
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p -= 1
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end
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end
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return dxp
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end
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end
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