matlab中如:a=1.23456789 如何输出a保留7位小数.>> a=1.23456789;b=0.12345678;a=vpa(a,7) b=vpa(b,7)a =1.234568b =.1234568为什么b不是0.1234568,如何可以让b=0.1234568
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![matlab中如:a=1.23456789 如何输出a保留7位小数.>> a=1.23456789;b=0.12345678;a=vpa(a,7) b=vpa(b,7)a =1.234568b =.1234568为什么b不是0.1234568,如何可以让b=0.1234568](/uploads/image/z/3020113-1-3.jpg?t=matlab%E4%B8%AD%E5%A6%82%EF%BC%9Aa%3D1.23456789+%E5%A6%82%E4%BD%95%E8%BE%93%E5%87%BAa%E4%BF%9D%E7%95%997%E4%BD%8D%E5%B0%8F%E6%95%B0.%3E%3E+a%3D1.23456789%3Bb%3D0.12345678%3Ba%3Dvpa%28a%2C7%29+b%3Dvpa%28b%2C7%29a+%3D1.234568b+%3D.1234568%E4%B8%BA%E4%BB%80%E4%B9%88b%E4%B8%8D%E6%98%AF0.1234568%EF%BC%8C%E5%A6%82%E4%BD%95%E5%8F%AF%E4%BB%A5%E8%AE%A9b%3D0.1234568)
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