34 lines
807 B
Matlab
Executable File
34 lines
807 B
Matlab
Executable File
function varargout = acot(varargin)
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%ACOT (overloaded)
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switch class(varargin{1})
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case 'double'
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error('Overloaded SDPVAR/ACOT CALLED WITH DOUBLE. Report error')
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case 'sdpvar'
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varargout{1} = InstantiateElementWise(mfilename,varargin{:});
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case 'char'
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operator = struct('convexity','none','monotonicity','none','definiteness','none','model','callback');
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operator.convexhull = [];
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operator.bounds = @bounds;
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operator.derivative = @(x)(-(1 + x.^2).^-1);
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varargout{1} = [];
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varargout{2} = operator;
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varargout{3} = varargin{3};
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otherwise
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error('SDPVAR/ACOT called with CHAR argument?');
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end
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function [L,U] = bounds(xL,xU)
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if xL<=0 & xU >=0
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L = -inf;
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U = inf;
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else
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L = acot(xU);
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U = acot(xL);
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end |