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sudo npm install [package you want] --unsafe-perm=true --allow-root 

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<a href="https://drive.google.com/uc?export=view&id=XXX"><img src="https://drive.google.com/uc?export=view&id=XXX" style="width: 500px; max-width: 100%; height: auto" title="Click for the larger version." /></a>

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Too Long, Didn't read: GitHub Flavored Markdown Spec

If you can read chinese, read this first then my file Markdown 是什么?

I suggest you to read the Raw file first then see this rendered page.

What is markdown?

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%3.1
A=2; f0=1000; phi=pi/2;
T0=1/f0;
tt=0:T0/40:4*T0;
xx=A*cos(2*pi*f0*tt+phi);
plot(tt,xx)
axis([0,0.004,-4,4])
xlabel('Time (sec)');
grid on

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Essential Tools in Lab

Mechancial

Mechancial Tools

Hex Nuts

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Note

Caution: Upgrading the system pip can cause problems.

If not in a virtual environment, use python3 -m pip for the commands. This ensures that you upgrade and use the Python pip instead of the system pip.

If unfortunately you accidently upgraded it and crashed...

If you got this error..

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# The crash reports are stored in /var/crash directory in Ubuntu.
# If you look in to this directory, you should see some files ending with crash.
$ ls -l /var/crash/

# delete all the content of directory /var/crash.
$ sudo rm /var/crash/*

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# 1. Homebrew Permissions Denied Issues Solution (https://gist.github.com/irazasyed/7732946)
$sudo chown -R $(whoami) $(brew --prefix)/*
# 2. Upgrade brew
$brew upgrade
# 3. https://stackoverflow.com/questions/30998890/installing-opencv-with-brew-never-finishes/31015713
$brew install gcc --force-bottle

# 4. Install OpenCV
$brew install opencv

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For MacOS

$ cd /etc/; sudo nano bashrc

For Linux

$ gedit ~/.bashrc

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Main Steps

sudo apt-get install build-essential

sudo apt-get install qtcreator

sudo apt-get install qt5-default

Note: The version you installed is 5.9.5.