# How To Print Elements of Vector Tags? **URL:** \ **Category:** GNU Radio\ **Created:** [April 12, 2014, 7:41am UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240408 "2014-04-12T07:41:20Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Post date:** [April 12, 2014, 7:41am UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240408/1 "2014-04-12T07:41:20Z")
Hi, I’m new to gnuradio and want to do some wireless communication experiments with it. I runned OFDM examples(rx\_ofdm.grc & tx\_ofdm.grc) and tried to use the _tag debug_ block to retrieve the CIR information generated during receiving procedure. Yet what tag debug block outputs is the key-value pair, _Key:ofdm\_sync\_chan\_taps Value:#_, but not the vector elements. Is there any way to print out the vector? Further more, is there any way to record down all tags in file? Thanks. – View this message in context: [http://gnuradio.4.n7.nabble.com/How-To-Print-Elements-of-Vector-Tags-tp47530.html](http://gnuradio.4.n7.nabble.com/How-To-Print-Elements-of-Vector-Tags-tp47530.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![qiank10](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/q/958977/32.png) [@qiank10](https://www.ruby-forum.com/u/qiank10)\ **Post date:** [April 12, 2014, 5:49pm UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240408/2 "2014-04-12T17:49:01Z")
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Giankun, as I had a similar problem a little while back, I finally came around to writing a fix for that. If you’re running a recent GNU Radio 3.7, you can try it out by executing git pull [GitHub - marcusmueller/gnuradio: GNU Radio · GitHub](https://github.com/marcusmueller/gnuradio.git) pmt\_io\_uniform\_vector\_to\_string (without the line break) in your GNU Radio source tree and rebuilding/installing GNU Radio. Greetings, Marcus On 12.04.2014 07:40, qiankun wrote: > Thanks. > > – View this message in context: [http://gnuradio.4.n7.nabble.com/How-To-Print-Elements-of-Vector-Tags-tp47530.html](http://gnuradio.4.n7.nabble.com/How-To-Print-Elements-of-Vector-Tags-tp47530.html) > Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). > \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Discuss-gnuradio > mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - [http://www.enigmail.net/](http://www.enigmail.net/) iQEcBAEBAgAGBQJTSWAlAAoJEBQ6EdjyzlHt+GgH/2wBQJtAgeU0VkplEHrc3Fzw cV9D0AA04XtzL2v15ucs0WyB4vhgAUy/iLHYCrKmNWOb2Oa6p17l1faGtvqUuuso D1BuyaSaRi2xaYESsDeqJk8OxxBCec+SOlkzWTgEMvHJ5TcjCBKJvV2f/OltceaY Hq2FK/XDDQqDiEWzD8SOpy1+XJC8ZT4WGxXv9i8jB9zBkZV8ecjC+1JJ5/eK0qis balwhtemojnh6rNo2i9A5GlWjOmQE6o58k4bkMA4sogwtuBMg0th1J5nYP5ETXmX S8kzBA2U8iUoeblnbV83SP2SfKDDpY2ZTkiUCg8588GHUEWwi+KvIiHM0ohrU14= =no0C -----END PGP SIGNATURE----- ---
**Author:** ![qiank10](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/q/958977/32.png) [@qiank10](https://www.ruby-forum.com/u/qiank10)\ **Post date:** [April 13, 2014, 11:28am UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240408/3 "2014-04-13T11:28:45Z")
Hi Marcus, Thanks for your help! The program outputs complex vectors in string format with your modified pmt objects: [http://gnuradio.4.n7.nabble.com/file/n47554/Screenshot\_from\_2014-04-13\_17-16-03.png](http://gnuradio.4.n7.nabble.com/file/n47554/Screenshot_from_2014-04-13_17-16-03.png) I’ll go on checking these CFR values and conducting the experiment. By the way, the official tutorial of gnuradio says that _file metadata sink_ can be used to record down detached stream tags. Is it possible for me to record down vector tags in file and post parse it using this sink? Thanks! – View this message in context: [http://gnuradio.4.n7.nabble.com/How-To-Print-Elements-of-Vector-Tags-tp47530p47554.html](http://gnuradio.4.n7.nabble.com/How-To-Print-Elements-of-Vector-Tags-tp47530p47554.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![qiank10](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/q/958977/32.png) [@qiank10](https://www.ruby-forum.com/u/qiank10)\ **Post date:** [April 14, 2014, 4:08pm UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240408/4 "2014-04-14T16:08:14Z")
On Sun, Apr 13, 2014 at 5:27 AM, qiankun [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I’ll go on checking these CFR values and conducting the experiment. > > By the way, the official tutorial of gnuradio says that _file metadata > sink_ > can be used to record down detached stream tags. Is it possible for me to > record down vector tags in file and post parse it using this sink? > > Thanks! Yes, the file meta sink stores any tags that flow through it in the header. See this page for details on the metadata file format: [http://gnuradio.org/doc/doxygen/page\_metadata.html](http://gnuradio.org/doc/doxygen/page_metadata.html) Tom