# Issue with stream to vector

**URL:** <https://www.ruby-forum.com/t/issue-with-stream-to-vector/230568>\
**Category:** GNU Radio\
**Created:** [June 24, 2014, 1:45pm UTC](https://www.ruby-forum.com/t/issue-with-stream-to-vector/230568 "2014-06-24T13:45:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 24, 2014, 1:45pm UTC](https://www.ruby-forum.com/t/issue-with-stream-to-vector/230568/1 "2014-06-24T13:45:45Z")

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Hi  
I’m trying to find IFFT of a stream of complex numbers and used the  
following flowchart. its constantly saying Source IO size “8” does not  
match sink IO size “4096”. How to overcome that error…

Regards

Sreena

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**Author:** ![sreena\_p\_h](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/47e85d/32.png) [@sreena\_p\_h](https://www.ruby-forum.com/u/sreena_p_h)\
**Post date:** [June 24, 2014, 1:58pm UTC](https://www.ruby-forum.com/t/issue-with-stream-to-vector/230568/2 "2014-06-24T13:58:50Z")

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use 512 in the num items field and 1 in the vec length field.