## Linear regression with multiple features

Single feature linear regression is simple. All you need is to find a function that fits training data best. It is also easy to plot data and learning curves. But in reality, regression analysis is based on multiple features. So in most cases, we cannot imagine the multidimensional space where data could be plotted. We need to rely on the methods we use. You must feel comfortable with linear algebra, where matrices and vectors are used. If previously we had one feature (temperature), now we need to introduce more of them. So we need to expand hypothesis to accept more features. From now and later on, instead of output y, we are going to use h(x) notation: As you can see, with more variables (features), we also end up with more parameters θ that has to be learned. Before we move let’s find relevant data that we could use for building machine learning algorithm. The data set Again we are going to use data set college cengage. This time we select health data set with several variables. The data (X1, X2, X3, X4, X5) are by city. X1 = death rate per 1000 residents X2 = doctor availability per 100,000…

## WiFi powered Xiaomi remote control gateway

In the previous review, we have talked about excellent WiFi routers that can be enhanced with intelligent devices. One such device can be Xiaomi Mi Smart WiFi remote control multi-function device. If you are looking for simple, robust, and fun home automation device, this could be a great choice. The main features of the Xiaomi Mi Smart WiFi Remote Control are:

## High performance Xiaomi Mi WiFi router 3

There are very few houses that still use LAN connection for most network connections. It is impractical to use wires for several network devices like laptops, printers, TVs, tablets, and others. In smartphones and tablets, there aren’t other options than WiFi. The more devices you add to the network list, the better router you should aim for. Probably some of you had a situation when the most straightforward router couldn’t reliably handle several devices connected to the internet simultaneously. The only option was to upgrade to better, which naturally tends to be more expensive. The good news is that you don’t have to pay more to get a great router to handle the loads and deliver high speed to all your connected devices. Check out the newest Xiaomi Mi WiFi router 3, which comes with four high-gain antennas delivering better coverage with more robust signal and better sensitivity. The router supports the latest 802.11ac WiFi standard, which, by using 2.4GHz and 5GHz bands, can deliver up to 1167Mbps in total.

## USB Boost Single Multi Power Kit assembly

One of my projects (AVR DDS 2.0) requires multiple power supplies that could supply +12V, -12V, and 5V. Back then, I have constructed a simple transformer-based power source with few linear voltage regulators. It works fine but is powered from mains 220V, which is not the safest solution to squeeze in to box enclosure. Another option was using the ATX PC power supply, which is too big. Banggood has been offering pretty attractive power supply kit which has a voltage boost circuit that raises voltage level either from USB or from the 5-24V jack. Power supply kit has most of the voltages that you may need including + 12V, -12V, + 5V, -5V, and +3.3V. It is capable of outputting 300mA per channel. Total power is limited to 10W, which is not bad and can provide a short-term high current single output, but be sure to attach included heat sinks to protect ICs from overheating. It is advised to keep the output currents of each channel to less than 0.2A.

## The best graphics cards for gaming

Ordinarily, you would expect your CPU to be the main driver of every function in your PC. However, when it comes to gaming, your CPU is virtually useless for your gaming experience if the graphics card is below par. A graphics card features a dedicated video memory and a graphics processing unit. It is the most vital component on your gaming PC. You won’t notice it’s important when playing simpler in-browser games, as provided on sites like bingosweets.com. Still, as soon as you fire up more demanding localised games, you will immediately see the difference between a high powered graphics card and a low powered one.

## Network attached storage (NAS) with Raspberry Pi

There is a Raspberry Pi 3 out there, which is much faster than versions 1 and 2. While latest two are faster than first model, I thought it would be great to give some purpose to first Raspberry Pi model B. We share several computers around the house and sometimes need simple file storage solution to make backups, share and store. Raspberry Pi model B is sufficient for simple Network Attached Storage (NAS) solution. Such network automation setup doesn’t need much processing power to manage the drive. And there is also an option to have a torrent client running 24/7. Another benefit of using Raspberry Pi is low power. Let’s go through all steps on how to set up Network Attached Storage on this Raspberry Pi. You can go with several different solutions for setting up NAS. You could go with cloud solution like Owncloud, which is similar to Dropbox. This might be convenient in many ways, but I would like to have the ability to use the drive as portable media when needed. In that case, I am going to stick with SAMBA server.

## 3 Ways To Increase Sales on Your Website

E-commerce is a booming industry that companies are making billions of dollars on. The thought of sitting in the comfort of your own home and being able to do any type of shopping is liberating. Many people shop daily online, and increasing sales is the primary goal of every small and large e-commerce company. There are certain things that can be done if your sales aren’t where you want them to be. The following are a few of the ways to increase sales on your e-commerce website. Having a fast and efficient checkout system is essential, as companies can lose millions of dollars in sales if the page has a bug or requires way too much information. The purchaser might get frustrated or have buyer’s remorse before purchasing the item. The speed and efficiency of the checkout page is critical as the checkout page closes the deal for the company. A page that reloads or freezes a computer could be clicked off, and the shopper will go to a competitor for the product.

## Continuously running Raspberry Pi torrent client

Previously we have configured basic NAS storage on Raspberry Pi. Having such power and doing nothing with storage is a waste. To prove its usefulness Next logical step is to implement a torrent client on this machine. The benefit is obvious. You have a NAS server that is always available and a torrent client that downloads/seeds files without the need power-hungry PC. You can find many torrent clients that can be used in Raspberry Pi, but it seems that lots of people prefer Deluge, which has plenty of features and requires small memory to run. Deluge is great in its flexibility – the ability to run on desktop, through the web interface, and through ThinClient. The other popular packet is Transmission, which is also lightweight and has great WebUI. Transmission can handle magnet links from the web interface. And it seems it is easier to configure. So we are going to stick with Transmission.

## Five Steps to Improve Your Cyber Security

Cyber security is one of the buzzwords in IT, often dominating the thoughts of IT professionals and the front pages of national newspapers and big websites. There’s no doubting that using a professional company to protect your business from cyber-attacks is the best option to choose. However, there are also some things you can do to increase your security. A great place to start is by looking through the government’s pamphlet entitled Small Businesses: What You Need to Know About Cyber Security. If you don’t have time to read through this pretty long document, though, we’ve condensed the five most important points for you, which you’ll find in the handy guide below.

## AVR GCC Structures

Structures in GCC are used in a variety of applications, such as: Basically, Structures are nothing more than collections of variables so, called members. Structures allow to reference of all members by a single name. Variables within a structure don’t have to be the same type. General structure declaration: or In the second example, we declared the variable name. Otherwise, variables can be declared this way: Members of the structure can be accessed by using the member operator (.). The member operator connects the member name to the structure. Let’s take an example: We can set the robot’s position by using following sentence: or simply Structures can be nested. A nested structure is a structure that contains another structure as one of its members. To access robot x coordinate, we have to write: Nested structures can be used in various applications, such as representing complex data types, like records or objects, and organizing data in a more readable and maintainable manner. They’re also helpful in systems programming, where you might need to represent hardware or software components as nested data structures. Actions can be taken with structures: Of course, you can treat a structure like a variable type. So you…