How to setup one patch with a particular colour in Netlogo? -

why work:

to setup   clear-all   ask n-of 1 patches [set pcolor green]  end 

but doesn't:

to setup      clear-all    ask patch-at 1 1 [set pcolor green]  end 

how have patch @ 1 1 change colour please?

thank you.

you need following:

to setup     clear-all   ask patch 1 1 [set pcolor green] end 

your code using patch-at reports (ie tells asking agent) location or patch coordinates of patch @ position (in case, 1 , 1 right) asker. is, relative position. instead, wanting ask patch specific coordinates or absolute position use patch's name such patch 1 1.