通过存储在列表中的坐标访问补丁 [英] Accessing patch through coordinates stored in a list

问题描述

我有一个列表，用于存储补丁的坐标列表.

I have a list which is storing the list of coordinates of patches.

let coor [ [0 1] [ 1 0] [1 -1] ]

现在，我想询问列表第二元素位置的补丁，将其颜色更改为红色.

Now I want to ask the patch at the location of the 2nd element of the list to change its color to red.

ask patch (item 1 coor) [ set pcolor red ] 

这会产生一个错误，要求修补程序使用数字而不是列表或块.如何使NetLogo理解(项目1的coor)是两个数字的集合?

This gives an error that patch expects a number instead of a list or block. How to make NetLogo understand that the (item 1 coor) is a set of two numbers?

还有其他方法可以解决此问题吗?我也尝试过使用'table'扩展名，但是同样的问题来了.

Any other way to approach this? I have also tried using 'table' extension for this but there also same issue was coming.

推荐答案

只需使用适当的报告程序即可:

Just use an appropriate reporter:

to-report patch-at-xy [#xy]
  let _x item 0 #xy
  let _y item 1 #xy
  report patch _x _y
end

这需要对您的上面的代码进行微小的更改:

This requires a tiny change in your code above:

to test
  let coor [ [0 1] [ 1 0] [1 -1] ]
  ask patch-at-xy (item 1 coor) [ set pcolor red ] 
end

也就是说，您几乎肯定应该存储补丁列表，而不是它们的坐标.

That said, you almost certainly should be storing a list of patches rather than of their coordinates.

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