The compiled code is able to run faster than code written in pure R, because the “figuring out” stuff is done first, and it can zoom ahead without the “translation” steps that R needs. In fft() the compiled code runs only after R figures out the data type in z, and also whether to use the default value of inverse. However, R still has to interpret the input of the function before passing it to the compiled code. These means R is calling a C, C++, or FORTRAN program to carry out operations. If you look at their source code, it will include. R is passing the data onto a C function called C_fft. This means that R takes care of a lot of basic computer tasks for you. R is a high-level, interpreted computer language. In both cases there are three addition operations to perform. This is easily achieved by use of the CSS opacity property - or using opacity in the SVG file itself.Why on earth should these take a different amount of time to calculate? Linear algebra isn’t magic. The obvious thing we need to do is make all the color in the background image be lighter. So what do we do? Adjusting the background to look nicer # Then of course, we'd like to put some content over the background.īut as you can see, the result is less than ideal since we can't read the text. You'll notice that no matter what the size of the display, the image is sized nicely with crisp clean edges. One easy way is to declare your background file using CSS fixed positioning: Lets take a look at how you could use a vector file as the background of a page. In any case, the SVG version is the same as the PNG in quality so wins on all accounts - both file size and clarity. It's easy to see that the file size saving in JPEG comes at a cost, with color artifacts at the sharp edges - probably making your retina think it needs glasses:-) To be fair, JPEG is optimized for photos, and that's why it's not as good for vector art. In the case of the HTML5 logo, it shrinks to just 663 bytes when compressed - and most modern browsers handle it with ease! When you compress SVG that way, the file extension has to be changed to ‘.svgz’. So we only need to serve one asset to our users, without ever needing to know what their screen or window size is - neat!īut wait, there's more - the HTML5 logo is just 1427 bytes! Yikes, that's so small that it will hardly dent any mobile data plan when loading it, which makes it fast to load and that makes it cheap and fast for your users!Īnother nice thing about SVG files is that they can be GZIP compressed to further shrink them. So what's the big deal? Well if you hadn't noticed, this is the only format that scales independently of the device we're using to look at it with. If we were to try that with a bitmap image, we'd either have to serve many different sizes for each screen we could encounter, or be forced to put up with horribly pixelated scaled images. Try opening it up in your favorite browser, resize the window and observe that the image is crisp at any magnification. The HTML5 logo is shown below - and you guessed it, it originates as an SVG file.Ĭlick on the logo and take a look at it in any modern browser and you'll see that it scales beautifully to any size window. So to illustrate, we'll start with the humble HTML5 logo. It'd be really useful to have your company logo, or anything like that full-screen in the background at all times, but of course that's super hard to do nicely with all the different screen sizes out there. Let's start with a simple scenario - you want a full page graphic to be the background of your web page. We'll dive into some ways to use SVG assets, plus some optimization tips to get you going. Popular authoring tools like the Drawing application in Google Drive, Inkscape, Illustrator, Corel Draw and lots of others generate SVG so there are lots of ways to generate content. One of the most useful things about SVG is that it’s resolution independent, meaning that you don’t need to think about how many pixels you have on your device, the result will always scale and be optimized by the browser to look great. SVG is a great way to present vector based line drawings and is a great complement to bitmaps, the latter being better suited for continuous tone images. We all know responsive design is a big part of handling varying screen sizes, and SVG is ideal for handling different size screens with ease. A great way to achieve vector drawing is through the use of Scalable Vector Graphics (SVG) which is a key part of HTML5. Many people think of canvas as the only way to draw a mixture of vectors and rasters on the web, but there are alternatives that have some advantages. Vector graphics are a great way to deliver stunning visual results using minimal bandwidth. Creating mobile content that dazzles means balancing the amount of data downloaded against maximal visual impact.
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