Hey folks,
This that somehow related the python code I used?
"""
Embedded Python Blocks:
Each this file is saved, GRC will instantiate the first class it finds to get
ports and parameters of your block. The arguments to __init__ will be the
parameters. All of them are required to have default values!
"""
import numpy as np
from gnuradio import gr
from sklearn.linear_model import LinearRegression
class blk(gr.sync_block):
def __init__(self, factor=1.0): # only default arguments here
gr.sync_block.__init__(
self,
name='Embedded Python Block',
in_sig=[np.complex64,np.complex64],
out_sig=[np.float32, np.float32, np.float32]
)
self.factor = factor
def work(self, input_items, output_items):
H = input_items[0] * input_items[1]
output_items[0][:] = np.abs(H)
phase = np.unwrap(np.angle(H))
output_items[1][:] = phase
##linear regression
phase_x_train = np.array(range(1,len(phase)+1)).reshape(-1,1)
phase_y_train = phase
regr = LinearRegression()
regr.fit(phase_x_train, phase_y_train)
print regr.coef_, regr.intercept_,
len(phase_x_train),phase_x_train[0],phase_x_train[-1]
output_items[2][:] = regr.predict(phase_x_train)
return len(output_items[0])
Or any others information needed for further trouble shooting?
Cheers!
BR//Jonny
On Tue, Jun 28, 2016 at 5:46 PM Hou Jonny <[email protected]> wrote:
Hi guys and gals,
>
> I get a question regarding buffer size when looping the file source:
>
> Currently I intent to have an offline processing with some captured data:
> read the data (for example, size 1201) from file sources, then handle the
> data with certain filtering and so on.... After that I intend to analysis
> the data with linear regression in python block. While the read size of
> data in GNURadio could not perfectly fit the size 1201 when looping
> ("REPEAT"=YES) enabled, which causes the linear regression some time happen
> between 2 loops of read(tail of the 1st loop and head of 2nd loop) and it
> leads to error results of regression.
>
> [image: Capture.PNG]
>
> I tried to adjust the max/min buffer value but it did not work as I
> expected. Warnings like "max output buffer set to 1536 instead of
> requested 1201" always popped up ...
>
> Any advice and insights?
>
> BR//Jonny
>
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