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function[residual] = evaluate_model(obj, varargin)
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y = obj.deconvolution.input';
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slope = varargin{1}(1);
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params = varargin{1}(2:end);
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x = obj.prf_convolve(obj.stick_model(params),slope);
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plot(y, 'k'); hold on; plot(x, 'r-');drawnow; hold off;
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residual = sum((y - x).^2);
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