y=sqrt((1+0.04*x.^2)./[(1-x.^2).^2+0.04*x.^2]);
首先sqrt之后是圆括号,不能用{}；
其次,你的.都加错地方了.
按我改正的式子可以出结果.
程序运行错误提示：Error using ==> mpower Matrix must be square.Error
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