请高手帮忙！字符转表达式的问题
ToExpression["m" <> ToString] = ToExpression["k" <> ToString] IdentityMatrix运行后
Set::write: Tag ToExpression in ToExpression is Protected. >>
{{k1, 0, 0, 0}, {0, k1, 0, 0}, {0, 0, k1, 0}, {0, 0, 0, k1}}
是怎么回事，请高手帮忙指点:handshake！本想让m1等于后面的矩阵，结果没有赋上后面的矩阵，还有那个提示!
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