# How To Print Elements of Vector Tags?

**URL:** <https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240388>\
**Category:** GNU Radio\
**Created:** [April 11, 2014, 8:44am UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240388 "2014-04-11T08:44:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [April 11, 2014, 8:44am UTC](https://www.ruby-forum.com/t/how-to-print-elements-of-vector-tags/240388/1 "2014-04-11T08:44:39Z")

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Hi,

I’m new to gnuradio and want to do some wireless communication  
experiments with it. I played with OFDM examples (rx\_ofdm.grc &  
tx\_ofdm.grc) and tried to use the TAG DEBUG block to retrieve the CFR  
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 elements of the CFR vector. Is  
there any way  
to print out the vector elements? Further more, is there any way to  
record down  
all tags in file?

Thanks.