求问两道matlab基础题1、求解方程组2x+y+3z=13x-y=-1y+z=5为什么这么写不对?:>> A=[2,1,3;1,-1,0;0,1,1];>> b=[13,-1,5]';>> x=A\bWarning:Matrix is singular to working precision.x =InfInfInf>> 2、在区间[-pi,pi]上,分别绘制sin(x
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![求问两道matlab基础题1、求解方程组2x+y+3z=13x-y=-1y+z=5为什么这么写不对?:>> A=[2,1,3;1,-1,0;0,1,1];>> b=[13,-1,5]';>> x=A\bWarning:Matrix is singular to working precision.x =InfInfInf>> 2、在区间[-pi,pi]上,分别绘制sin(x](/uploads/image/z/3163717-37-7.jpg?t=%E6%B1%82%E9%97%AE%E4%B8%A4%E9%81%93matlab%E5%9F%BA%E7%A1%80%E9%A2%981%E3%80%81%E6%B1%82%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%842x%2By%2B3z%3D13x-y%3D-1y%2Bz%3D5%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%99%E4%B9%88%E5%86%99%E4%B8%8D%E5%AF%B9%3F%EF%BC%9A%3E%3E+A%3D%5B2%2C1%2C3%3B1%2C-1%2C0%3B0%2C1%2C1%5D%3B%3E%3E+b%3D%5B13%2C-1%2C5%5D%27%3B%3E%3E+x%3DA%5CbWarning%3AMatrix+is+singular+to+working+precision.x+%3DInfInfInf%3E%3E+2%E3%80%81%E5%9C%A8%E5%8C%BA%E9%97%B4%5B-pi%2Cpi%5D%E4%B8%8A%2C%E5%88%86%E5%88%AB%E7%BB%98%E5%88%B6sin%28x)
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