我正在尝试为每个补丁分配一个特定的值，这取决于它与某一组乌龟的距离。这些值将存储在表格中。有没有办法在补丁迭代中迭代海龟？这是我的代码的一部分：
ask patches [
let this_xcor pxcor
let this_ycor pycor
if pcolor != obstacle-color [
ask turtles with [patch-ahead Movement_Speed = obstacle-color][
set patchdist sqrt(((xcor - this_xcor)*(xcor - this_xcor) + (ycor - this_ycor)*(ycor - this_ycor)))