cg.asv

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function [xmin,fmin]=CG()

switch Dim
    case 1
        x1_derivative=diff(f_derivative,'x1');
    case 2
        x1_derivative=diff(f_derivative,'x1');
        x2_derivative=diff(f_derivative,'x2');
        f1=eval(x1_derivative)
    case 3
        x1_derivative=diff(f_derivative,'x1');
        x2_derivative=diff(f_derivative,'x2');
        x3_derivative=diff(f_derivative,'x3');
    case 4
        x1_derivative=diff(f_derivative,'x1');
        x2_derivative=diff(f_derivative,'x2');
        x3_derivative=diff(f_derivative,'x3');
        x4_derivative=diff(f_derivative,'x4');
    case 5
        x1_derivative=diff(f_derivative,'x1');
        x2_derivative=diff(f_derivative,'x2');
        x3_derivative=diff(f_derivative,'x3');
        x4_derivative=diff(f_derivative,'x4');
        x5_derivative=diff(f_derivative,'x5');
    otherwise
        error('programme is wrong!')