Matlab 里编写的牛顿迭代法,不知道什么出错了,请大家帮帮忙function newton(f,a)g=diff(f);for n=1:20 x=a; fa=eval(f); ga=eval(g); a=a-fa/ga; X=a; format longdisp(X)%output 'approximate value of a'end 当我用x^3+x^2+5
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![Matlab 里编写的牛顿迭代法,不知道什么出错了,请大家帮帮忙function newton(f,a)g=diff(f);for n=1:20 x=a; fa=eval(f); ga=eval(g); a=a-fa/ga; X=a; format longdisp(X)%output 'approximate value of a'end 当我用x^3+x^2+5](/uploads/image/z/3687486-6-6.jpg?t=Matlab+%E9%87%8C%E7%BC%96%E5%86%99%E7%9A%84%E7%89%9B%E9%A1%BF%E8%BF%AD%E4%BB%A3%E6%B3%95%2C%E4%B8%8D%E7%9F%A5%E9%81%93%E4%BB%80%E4%B9%88%E5%87%BA%E9%94%99%E4%BA%86%2C%E8%AF%B7%E5%A4%A7%E5%AE%B6%E5%B8%AE%E5%B8%AE%E5%BF%99function+newton%28f%2Ca%29g%3Ddiff%28f%29%3Bfor+n%3D1%3A20+++x%3Da%3B+++fa%3Deval%28f%29%3B+++ga%3Deval%28g%29%3B+++a%3Da-fa%2Fga%3B+++X%3Da%3B+++format+longdisp%28X%29%25output+%27approximate+value+of+a%27end+++%E5%BD%93%E6%88%91%E7%94%A8x%5E3%2Bx%5E2%2B5)
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