# Fwd: Re: something about forecast()

**URL:** <https://www.ruby-forum.com/t/fwd-re-something-about-forecast/230190>\
**Category:** GNU Radio\
**Created:** [June 4, 2014, 11:07am UTC](https://www.ruby-forum.com/t/fwd-re-something-about-forecast/230190 "2014-06-04T11:07:41Z")\
**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 4, 2014, 11:07am UTC](https://www.ruby-forum.com/t/fwd-re-something-about-forecast/230190/1 "2014-06-04T11:07:41Z")

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-------- Original Message --------  
Subject: Re: [Discuss-gnuradio] something about forecast()  
Date: Wed, 4 Jun 2014 16:52:11 +0800 (CST)  
From: xianda [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
To: Marcus M??ller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

Hi:  
Thank you.  
1.Oh,I understand it.If i say,this is according to how many  
input ports we connct to the block.If we connect 2 input ports(connect  
in python program),then use the ninput\_items\_required.size (),it will  
tell us 2.Right?  
2.Another question i want to ask.Thank you.I have check my program as  
you said"However, you should not do get\_tx\_stream for every sample chunk  
you transmit, but only once for every USRP, before starting to  
send.".But i run my code,it also display so many “L L L”.Is the sample  
to send too short?Thank you.Any advices will be appreciated.

Best regards,

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**Author:** ![Marcus\_MS\_ller](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/5daacb/32.png) [@Marcus\_MS\_ller](https://www.ruby-forum.com/u/Marcus_MS_ller)\
**Post date:** [June 4, 2014, 11:14am UTC](https://www.ruby-forum.com/t/fwd-re-something-about-forecast/230190/2 "2014-06-04T11:14:10Z")

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Hi Xianda,

1.:  
Yes, that will be the case

Greetings,  
Marcus