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Re: [Discuss-gnuradio] Float is required error for customized Block

From: Gilad Beeri (ApolloShield)
Subject: Re: [Discuss-gnuradio] Float is required error for customized Block
Date: Wed, 03 Jan 2018 04:18:15 +0000

This is related to Python, not GNU Radio per se. It seems that you pass in1 to math.log10().
I assume that you define in1 as input_items[1], which is a list of items to process (not a single item), while the log function expects to get a float, not a list.

Something like:
for item in in1:
  c = math.log10(item) 

should work for you. I guess there's a numpy function that will run the log function on a list more efficiently.

On Tue, Jan 2, 2018, 20:10 Tellrell White <address@hidden> wrote:
Hello Guys

I'm creating a customized block in the GNU Radio framework using python that takes in a number of input items and once that number of input items surpasses a certain number, 1024 of the input items are taken and stored into an array, and then those items are converted to dB and lastly compared to a threshold value, 5 in this case. If any of the values are greater than the threshold value, a message is printed indicating a signal is present, and if none of the values are greater than 5, this is indicated with a message stating "No signal is present".

When I run the flow graph which uses this block I get the following error.

handler caught exception: a float is required
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gateway.py", line 55, in eval
    try: self._callback()
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gateway.py", line 144, in __gr_block_handle
    ) for i in self.__out_indexes],
  File "/home/tellrell/Ener_detec.py", line 42, in general_work
    c = math.log10(in1)         #converts 1024 values stored in in1 to dB and stores them in c
TypeError: a float is required
thread[thread-per-block[8]: <block ED_block (22)>]: caught unrecognized exception

The .py script for the customized block along with the corresponding .grc file are attached below.

Any help would be great.

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