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def average_dbm(dbms):
    # https://en.wikipedia.org/wiki/Decibel
    # https://en.wikipedia.org/wiki/LogSumExp

    # Less numerically stable version:
    #  10*numpy.log10(numpy.mean(numpy.power(10, (dbms-30)/10)))
    bel_np = 0.5 * numpy.log(10)  # Bel & Neper by definition
    dbel_np = bel_np / 10
    np_to_db = 1 / dbel_np

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import logging

import cv2

def main():
    cap = cv2.VideoCapture("uhU.webm")

    cap.set(cv2.CAP_PROP_POS_MSEC, 1000.0)
    #cap.set(cv2.CAP_PROP_POS_FRAMES, 1000.0)
    w, h = cap.get(cv2.CAP_PROP_FRAME_WIDTH), cap.get(cv2.CAP_PROP_FRAME_HEIGHT)

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grub bootloader changes

Two changes were required for GRUB bootloader

Delay

Adding 15 second boot menu delay to grub config solves thunderbolt boot failure.

Delay is added to /etc/default/grub

$ cat /etc/default/grub
...

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Buildroot & QEMU

Navigating menuconfig

• Search with /
• Jump with 1

Building Commands

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#
# Loops
#

# Loop files with weird names and reading from console stdin.
while IFS= read -r -d $'\0' FILE; do
	read -p "Press Enter to continue to \"$FILE\"" </dev/tty
done < <(find . -printf "%P\0" | grep --null-data "filter")

# Loop files with less surprises

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#  Defaults
# ==========
set grid
set datafile separator ","
set print "-" # enable logging
print "Hello world"
set autoscale fix  # Axes tight

#  CSV column headers
# ====================

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From: http://www.mp3car.com/vbulletin/engine-management-obd-ii-engine-diagnostics-etc/75138-calculating-mpg-vss-maf-obd2.html



For the record, the first "one-line" MPG formula above, taken from
my Circuit Cellar article, is off by 100!  The "4.54" should in
fact be "454".  The correct formula is:

MPG = (14.7 * 6.17 * 454 * VSS * 0.621371) / (3600 * MAF / 100) MPG
= 710.7 * VSS / MAF

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# Install fromm Ubuntu Software Center

# Add following to ~/.bashrc

# Cool Retro Term doesn't properly identify as a 256 color terminal.
# Force it to identify as xterm-256color instead of just xterm.
[ -z "$COLORSCHEMES_DIR" ] || export TERM='xterm-256color'

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mbed_trace_config_set(mbed_trace_config_get() & ~TRACE_MODE_COLOR);