In machine learning, the gradient descent (Gradient descent, GD) algorithm only needs to calculate the first derivative of the loss function, the calculation cost is small, it is very suitable for the training data very large application.The physical meaning of the gradient descent method is well understood, that is, the line is searched along the gradient direction of the current point, and the next iteration point is found. But, why does it derive t
Use the GD library to generate images with shadow text and gd shadow. The GD library is used to generate images with shadow text. the gd shadow Library is recently used to generate images for public accounts, after studying the generation of text shadow effects in the GD lib
GD: Gd support library for installing PHP in Linux. Gd support library for installing PHP in Linux
1. Download
Gd-2.0.33.tar.gz http://www.boutell.com/gd/Jpegsrc.v6b.tar.gz http://www.ijg.org/Libpng-1.2.7.tar.tar http://sourceforge.net/projects/libpng/Zlib-1.2.2.tar.gz http
Use the GD library to create a picture with shaded text, GD shadow
Recently, the use of GD library for the public account of the image generation, the study of the GD library text shadow effect generated at the same time also found the strong GD library.
Example of using the GD library to create a round pie chart in PHP, GD round
In PHP, there are some simple image functions can be used directly, but most of the images to be processed, you need to compile PHP with the GD library. In addition to installing the GD library, additional libraries may be required in PHP, de
GD database usage summary --- 2, gd summary --- 2. GD database usage summary --- 2, gd summary --- 2 and the previous article. The GD library can be used in a lot of ways. of course, it must be related to drawing. in addition to the verification code and watermark, the
Linux under compilation GD (Freetype+libjpeg+libpng+gd-devel)1. Check whether the FreeType is installedRpm-qa | grep FreeTypeNo words compiled freetype here downloadHttps://www.freetype.org/download.htmlhttp://download.savannah.gnu.org/releases/freetype/./configure--prefix=/usr/local/freetypeMake make install, no flower head 2. Check if Libjpeg is installed Rpm-qa | grep libjpeg No compile libjpeg downlo
/usr/local/jpeg/bin Mkdir-p/usr/local/jpeg/man/man1 OK, and then the compilation is successful.3, check whether the installation of libpngRpm-qa libpngNo words compiled libpng here download./configure--prefix=/usr/local/pngMake make install4, install the GD library here to downloadTAR-ZXVF gd-2.0.35.tar.gzCD gd-2.0.35./configure--PREFIX=/USR/LOCAL/GD25, compil
Understanding the GD Library in php , using the GD Library to manipulate the image,the GD Library is an open, dynamically created image of the source code of the public Library, available from the official website HTTP://WWW.BOUTELL.COM/GD Download it here. Currently, theGD Library supports Multiple image formats such
Compile GD in linux (freetype + libjpeg + libpng + gd-devel)1. Check whether freetype is installedRpm-qa | grep freetypeIf not, compile freetype and download it here../Configure -- prefix =/usr/local/freetype
Make make install.2. Check whether libjpeg is installed.
Rpm-qa | grep libjpeg
If not, compile libjpeg and download it here.
I haven't installed libjpeg either. Download it and start compiling.
Jpegsr
Use GD to draw a pie chart and gd to draw a pie chart. Use GD to draw a pie chart in PHP and gd to draw a pie chart in PHP. for the class to be drawn, see the code: 1 ClassChart {2 private $ image; define image 3 private $ title; define Title 4 priv PHP use GD to draw a pie
Example of using the GD library in PHP to create a circular pie chart: gd circle
Some simple image functions can be directly used in PHP, but most of the images to be processed need to be added to the GD library during PHP compilation. In addition to installing the GD library, other libraries may be required in PHP, de
.
Mkdir-P/usr/local/JPEG/include
Mkdir-P/usr/local/JPEG/lib
Mkdir-P/usr/local/JPEG/bin
Mkdir-P/usr/local/JPEG/man/Man1
OK, then the compilation is successful.
3. Check whether libpng is installed.
Rpm-Qa libpng
If not, compile libpng and download it here.
./Configure -- prefix =/usr/local/PNG
Make make install
4. Install the GD library. Download it here.
Tar-zxvf gd-2.0.35.tar.gz
CD
Reading books together-reading books in PHP and reading books in php
We had to learn about android, and PHP started to read books. Two 500 + books, 45 days not enough, a little busy...
The bloat in the morning is just a music stick. Keep a long memory ........
1. PHP + MY
GD Library Use Summary---2,GD summary---2
Then the previous article. GD Library can toss a lot of usage out, of course, with drawing related, in addition to the previous verification code, watermark, can also be scaled image, cutting, rotation and other operations, which can be seen in many applications.
1. Add watermark
As already known, we can use Imagechar or
GD database usage summary --- 2, gd summary --- 2
Next, go to the previous article. The GD library can be used in a lot of ways. Of course, it must be related to drawing. In addition to the Verification Code and watermark above, it can also perform operations such as scaling, cropping, and rotating the image, this can be seen in many applications.
1. Add a waterm
Use of the php-gd library -- Use php (1) and php-gd together with zhaocuan
I originally made c #, and switched to php for unit reasons. I have been exploring for myself, having problems with Baidu, and working with various groups to solve my own problems. Recently, the job entered the burnout period, and it happened to be idle. Prepare to update the System and review your knowledge and skills. This is the f
As a Java programmer, the most painful thing is to choose too wide, can read too many books, often easily confused. I would like to choose some of the technical books I have read, according to the Order of study, recommend to everyone, especially those who want to constantly improve their technical level of Java programmers. In addition, you can join 457036818 Exchange groups and share your knowledge about
There are a large number of computers, technologies and other e-books to download, the speed is good, hope to help friends!
The purpose of reading books is usually two. One is to acquire knowledge, and the other is to entertain and relax. As the Internet develops, reading has gradually become a new digital media platform-ebook. In this article,We have collected 35 free English e-
[From Renren network source address: http://blog.renren.com/GetEntry.do? Id = 896285182 owner = 274281790,Very touched !!]
In the past, I would like to read a book before reading, but in actual reading, I often "want to read a book" rather than "want to read a book ". This kind of thinking often makes my life very painful. When you want to finish something quickly, your mind is no longer in this matter.
This problem has plagued me for a long time in college. I don't realize that this is actuall
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