Hello,
tables in Lua are "shared" - there is one copy until you "deep copy" one to
another.
Se comments bellow -
On Mon, 13 Feb 2017 06:50:38 +0100, Jeong Dal <[email protected]> wrote:
Dear all,
It may be a slight off topic.
In the following example, I copied a table “m” to “tempM”, and remove the last
row of tempM.
Then the output is “ 2, 2”
I checked the contents of tempM and m and found that they are same even though
I didn’t touch m.
I want to remove the last row of tempM while keeping the table m untouched.
Please tell me how to do it.
Thank you.
Best regards,
Dalyoung
\startbuffer[test]
\startluacode
m = {{0, 2, 4},{2, 3 , 4}, {2, 2, -6}}
local tempM = {} -- OK, 'tempM' and 'm' are different tables - try
'print(tempM, m)' - you'll get two addresses
tempM = m -- Now, 'tempM' and 'm' will point to the same table - "the 'm' table"
-- The original 'tempM' table will be forgotten and removed during next garbage
collection as there is no other reference to it
-- ('tempM' starts pointing to 'm', too)
table.remove(tempM) -- Will remove from one
context(#tempM, “, ” , #m) -- Obviously - both table point to the same object,
try again 'print(tempM, m)'
\stopluacode
\stopbuffer
\starttext
getbuffer[test]
\stoptext
Best regards,
Lukas
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Ing. Lukáš Procházka | mailto:[email protected]
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