问题
I've got some turtles which are looking around themselves. For each neighbor they've got, they save the value of "output-heat". The patch with the highest value will get the highest probability and the lowest value the lowest probability. I want the turtle to move to another patch. The moving should be dependent on the probabilities.
My code looks like this, but it doesn't work like it should:
ask turtles-here[
let temp_ahead [(output-heat + 1)^ Freedom] of patch-at 0 1
let temp_right_ahead [(output-heat + 1)^ Freedom] of patch-at 1 1
let temp_right [(output-heat + 1)^ Freedom] of patch-at 1 0
let temp_right_back [(output-heat + 1)^ Freedom] of patch-at 1 -1
let temp_back [(output-heat + 1)^ Freedom] of patch-at 0 -1
let temp_left_back [(output-heat + 1)^ Freedom] of patch-at -1 -1
let temp_left [(output-heat + 1)^ Freedom] of patch-at -1 0
let temp_left_ahead [(output-heat + 1)^ Freedom] of patch-at -1 1
set temp_ahead_kumulativ temp_ahead
set temp_right_ahead_kumulativ (temp_ahead_kumulativ + temp_right_ahead)
set temp_right_kumulativ (temp_right_ahead_kumulativ + temp_right)
set temp_right_back_kumulativ (temp_right_kumulativ + temp_right_back)
set temp_back_kumulativ (temp_right_back_kumulativ + temp_back)
set temp_left_back_kumulativ (temp_back_kumulativ + temp_left_back)
set temp_left_kumulativ (temp_left_back_kumulativ + temp_left)
set temp_left_ahead_kumulativ (temp_left_kumulativ + temp_left_ahead)
set propability_number (random-float (temp_left_ahead_kumulativ))
if propability_number < temp_ahead_kumulativ [right 0]
if propability_number < temp_right_ahead [right 45]
if propability_number < temp_right_kumulativ [right 90]
if propability_number < temp_right_back_kumulativ [right 135]
if propability_number < temp_back_kumulativ [right 180]
if propability_number < temp_left_back_kumulativ [left 135]
if propability_number < temp_left_kumulativ [left 90]
if propability_number < temp_left_ahead_kumulativ [left 45]
]
回答1:
You need to turn all the if statements at the end into ifelse statements. The way you have it set up, a low random number will make the turtle turn in multiple directions.
ifelse propability_number < temp_ahead_kumulativ [right 0] [
ifelse propability_number < temp_right_ahead [right 45] [
....
ifelse propability_number < temp_left_kumulativ [left 90]
[left 45] ] ] ] ] ] ] ]
NOTE: I probably got the number of ] wrong, you will need to make sure that when you have the cursor at the last one, the [ at the top of the first line is highlighted.
来源：https://stackoverflow.com/questions/33399494/how-can-i-set-a-probability-for-each-action