If all the values in the table are 0 or negative and you want to set them all to positive then you can use the short script below.
- Copy-paste script into Script Editor (in Applications > Utilities).
- Make sure Script Editor.app is listed and checked at System Preferences > Security & Privacy > Privacy > Accessibility.
- Click anywhere in the table that contains the negative values you want to change to positive.
- Click the triangle 'run' button in Script Editor.
Done in a few seconds.
SG
tell application "Numbers"
tell front document's active sheet
tell (first table whose selection range's class is range)
repeat with c in cells
set v to c's value
try
if v < 0 then set c's value to v * -1
end try
end repeat
end tell
end tell
end tell