在Mathematica中添加第三列数据 [英] Adding a Third column of data in Mathematica

问题描述

我有一个非常大的数据表，例如:

I have a very large table of data something like:

lista = {{2,8},{3,4},{5,2}..}

我想将x添加到每个元素中

I would like to add x to every element so it would be

lista ={{x,2,8},{x,3,4},{x,5,2}.....}

在我看来，这似乎应该是微不足道的，但我一直无法找到解决方案.

This seems to me like it should be rather trivial but I have not been able to find a solution.

我将不胜感激.

推荐答案

这几乎是追加到表格和将0附加到子列表上的精确重复项问.这些线程中提供了更多带有定时的方法，但是这里有两个很好的方法可以开始:

This is very nearly a duplicate of Appending to the rows of a table and an exact duplicate of Prepend 0 to sublists on the dedicated site where your question should have been asked. Many more methods, with timings, are provided in those threads but here are two good methods to start with:

lista = {{2, 8}, {3, 4}, {5, 2}};

ArrayPad[lista, {{0, 0}, {1, 0}}]

{{0, 2, 8}, {0, 3, 4}, {0, 5, 2}}

或者:

ArrayFlatten @ {{0, lista}}

{{0, 2, 8}, {0, 3, 4}, {0, 5, 2}}

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