Using ETS Select To Form An Intersection

Posted by Ruhi on Stack Overflow See other posts from Stack Overflow or by Ruhi
Published on 2010-04-27T22:15:30Z Indexed on 2010/04/28 0:33 UTC
Read the original article Hit count: 341

Filed under:

erlang

|

ets

|

set

|

intersection

i have the following ets structure:

SomeTable = ets:new(sometable, [bag]).
ets:insert(SomeTable, [
                        {set1,item1},
                        {set1,item2},
                        {set1,item3},
                        {set2,item1},
                        {set2,item2},
                        {set2,item4}]).

i want to get intersection of set1 and set2 using ets:select and fun2ms, result will be [item1, item2].

i spent hours and hours trying to accomplist it with ets:select and fun2ms with no success. can you help me out using ets:select and fun2ms?

thanks for all answers!

ps: i know about sets module, but i have to use ets and this exact data structure.

© Stack Overflow or respective owner

Related posts about erlang

Starting an Erlang slave node in escript fails when using custom Erlang in Ubuntu 10.4

as seen on Stack Overflow - Search for 'Stack Overflow'
I have the following escript: #!/usr/bin/env escript %%! -name [email protected] main(_) -> NodeName = test, Host = '127.0.0.1', Args = "", {ok, _Node} = slave:start_link(Host, NodeName, Args), io:format("Node started successfully!"). When running it on Ubuntu 10.04… >>> More
How to setup Erlang + Emacs with erlang.el?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have downloaded and installed Erlang and EmacsW32. But how do I use erlang.el in Emacs? Where do I place it or install it? I have read Erlang/OTP R13B04 documentation and Erlang mode for Emacs documentation but I haven't found any information about how to set up it. >>> More
How do I install LFE on Ubuntu Karmic?

as seen on Stack Overflow - Search for 'Stack Overflow'
Erlang was already installed: $dpkg -l|grep erlang ii erlang 1:13.b.3-dfsg-2ubuntu2 Concurrent, real-time, distributed function ii erlang-appmon 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP application monitor ii erlang-asn1 … >>> More
How to switch between the upper and lower pane in emacs?

as seen on Super User - Search for 'Super User'
I am using the erlang mode in Aquamacs. The mode, by default, creates a new pane and buffer "*erlang*" when I hit C-C C-K to compile an erlang file. (as seen in the attached screen shot) What is the easiest way to switch between these two panes? I do not think "C-x b" is applicable in this case… >>> More
Erlang: Mnesia or Mysql ?

as seen on Stack Overflow - Search for 'Stack Overflow'
What DMBS do you use with Erlang ? and Why ? >>> More

Related posts about ets

Using ETS Select To Form An Intersection

as seen on Stack Overflow - Search for 'Stack Overflow'
i have the following ets structure: SomeTable = ets:new(sometable, [bag]). ets:insert(SomeTable, [ {set1,item1}, {set1,item2}, {set1,item3}, {set2,item1}, {set2,item2}, … >>> More
Erlang: Find intersections in a ets table

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an ets with the next items: [at, {other_place}, me], [other_place, {place}, {other_place}]], [at, {place}, me], [on, {surface}, {object}], [small, {object}] And I have the list [[at, door, me],[on, floor, chair],[small, bannanas]] I need to compare every item in the ets table to an item… >>> More
How to download the Enthought Tool Suite python script?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have Python downloaded already, but want to contribute code to the Enthought Tool Suite (ETS). According to this site (http://code.enthought.com/source/): it says to download the following python script: https://raw.github.com/enthought/ets/master/ets.py I put the ets.py into the python script… >>> More
gen_server with a dict vs mnesia table vs ets

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm building an erlang server. Users sends http requests to the server to update their status. The http request process on the server saves the user status message in memory. Every minute the server sends all messages to a remote server and clear the memory. If a user update his status several… >>> More
Conference on LinQ at Montreal's ETS

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Today I gave a presentation at Montreal's "Ecole de Technologies Supérieure" and I said I would put my presentation and the material itself online in here.... The audience was exclusively composed of teachers from colleges around Montreal. There's the link to download the content : http://cid-bdf9cf467011e705… >>> More