clear% fun = @(x,y) (x>=0&&y>=0)*(x+y)+(x>=0&&y<0)*(x+y.^2)+(x<0&&y>=0...
clear;R=@(b)(1.2963./((382.6912.*(b+2)+57.6757.*(1+b))./(1.4487.*(2.*b+2)+1.2756.*(2-b))-100)).^(1/3);Sigmare=@(b,r)100+(-100+((382.6912.*(b+2)+57.6757.*(1+b))./(1.4487.*(2.*b+2)+1.2756.*(2-b)))...
5通过命令文件,画出..clear [x1,x2]=meshgrid(linspace(-1,1));p1=0.5457*exp(-0.75*x2.^2-3.75*x1.^2-1.5*x1).*( (x1+x2) >1