endolith

#!/usr/bin/env python

"""
See http://opencountrycodes.appspot.com/python/

state_names returns a state name for a state code, like 'AK': 'Alaska'
country_names returns a country name for a country code, like 'AD': 'Andorra'
state_codes and country_codes are just the reverse
"""

endolith

function [maxtab, mintab]=peakdet(v, delta, x)
%PEAKDET Detect peaks in a vector
%        [MAXTAB, MINTAB] = PEAKDET(V, DELTA) finds the local
%        maxima and minima ("peaks") in the vector V.
%        MAXTAB and MINTAB consists of two columns. Column 1
%        contains indices in V, and column 2 the found values.
%      
%        With [MAXTAB, MINTAB] = PEAKDET(V, DELTA, X) the indices
%        in MAXTAB and MINTAB are replaced with the corresponding
%        X-values.

endolith

"""
Train a neural network to learn an FIR filter.

Created on Fri Aug  3 15:00:40 2018
"""
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense
from tensorflow.keras.callbacks import Callback
import numpy as np
from scipy import signal

endolith

My first keras experiments:

1. simplest.py — A single neuron with no activation function and no bias (so just input→weight→output, can learn y=mx functions only). Show the function for a few random weights. (Doesn't learn anything.)
2. linear with bias.py — A single neuron with no activation function but with bias (so it can learn y=mx+b functions, such as relationship between Celsius and Fahrenheit).
3. single_neuron_buffer.py — A single neuron with sigmoid activation and no bias, trained to learn a digital logic buffer.
4. single_neuron_inverter.py — A single neuron with sigmoid activation and no bias, trained to learn an inverting analog amplifier.

endolith

; c = case sensitive
; c1 = ignore the case that was typed, always use the same case for output
; * = immediate change (no need for space, period, or enter)
; ? = triggered even when the character typed immediately before it is alphanumeric
; r = raw output

;------------------------------------------------------------------------------
; CHANGELOG:
;
; 2011-03-21 and after:  See readme.md

endolith

MIT License

Copyright (c) 2012 endolith

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

endolith

! Title: Finite Scroll (kills infinite scrolling)
! Last modified: 2017-10-24
! Homepage: https://gist.github.com/endolith/72ac5e69e037be02b118adbedcdeac59
! This URL: https://gist.githubusercontent.com/endolith/72ac5e69e037be02b118adbedcdeac59/raw/finite_scroll.txt


! TODO: Add these scripts: https://infinite-scroll.com/


! Forbes infinite scroll (and all other AJAX) 

endolith

"""Chirp z-Transform.

As described in

Rabiner, L.R., R.W. Schafer and C.M. Rader.
The Chirp z-Transform Algorithm.
IEEE Transactions on Audio and Electroacoustics, AU-17(2):86--92, 1969
"""

import numpy as np

endolith

""" Zoom FFT function"""

import numpy as np
from time import time
from scipy.fftpack import fft, ifft
from numpy import swapaxes

def chirpz(x, A=None, W=None, M=None):
    """chirpz(x, A, W, M) - Chirp z-transform of variable x

endolith

/* Decibel conversion and inverse */
db(x)  := float(20 * log(abs(x)) / log(10));

idb(x) := float(10^(x / 20));

/* For calculating components in parallel */
infix("||", 119, 119)$ "||"(x, y) := x * y / (x + y);

/* log(x) is always ambiguous from one language to the next.  Now it's not. */
log10(x) := log(x) / log(10);