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Cluster Analysis notes

different types of attributes:Clusters of any shape are found:FIELD knowledge used to determine input parameters is minimized: input parameters have a great impact on cluster analysis.Ability to process noise data:Insensitive to the order of input records:High Dimension:Constraint-based clustering:Interpretability and availability:2. Data Types in Cluster Analysis(1) Data MatrixP variables are used to represent n objects, NXP matrix.(2) similarity Ma

Machine learning from Statistics (II.) Some thoughts on multiple collinearity

. So, why is this so? The reason is simple: there are highly correlated variables in the data (up to 0.987 of the x1,x2 correlation), and the two variables are so similar, like two parallel vectors, that is, they're collinear . Popular, because two software is too similar, so that cannot judge who can contribute greater user satisfaction, the two 10:0 open, 5:5 Open, 0:10 open almost no difference. As can be seen from the above results, the standard error of β1 reached 2.3947 and β2 reached 2.4

How to use Keil-common functions (i)

commonly used two, the author also used the two software for many years, there are many similarities. I mainly use mdk-arm To summarize how it is used, and if you use several other software, there may be some differences in some places. Mdk-arm meaning is based onARMMicrocontroller Development Tools (microcontroller Developer Kit), byKeilCompany Development,Mdk-armcontains industry-standardKeil Ccompiler, macro assembler, debugger, real-time kernel and other components. With the leading busines

(reprint) Mathematical basis for 3D graphics programming (2) matrix and its operation

actual relay.For example, using column precedence in OpenGL, but what if we have a row-first data? It can be loaded by loading the transpose matrix, which meansThe glloadtransposematrix* function.Transpose is implemented in D3D by the function D3dxmatrixtranspose.The code to implement the transpose in Irrlicht is as follows: Returns transposed matrix template It should be easy to understand because the transpose itself is simple.Matrix multiplicationMatrix multiplication is referred to 1

LPC1800 and LPC4300 Boot

When programming and running code from the external flash, it's particularly important to make sure so you have the Boo T pins P2_9, P2_8, P1_2, and p1_1 is correctly connected so this MCU starts execution from the correct memory address . For more details, please see the NXP documentation.If The boot pins is incorrectly set, then this would typically result in the initial default breakpoint set by the Debugge R on Main () is not been reached. You can

LPC4350 Sgpio Experimentation

LPC4350 Sgpio ExperimentationThe NXP lpc43xx microcontrollers has an interesting, programmable serial peripheral called the Sgpio (serial GPIO).It consists of a slew of counters and shift registers that can is configured to serialize and deserialize many channels of Data.Channels can grouped to create multi-bit parallel data streams.AN11210 Using Sgpio to emulate an SPI master interfaceAN11275 Sgpio on the lpc4300-emulating PWM via SgpioAN11343 Sgpio

The YubiKey NEO--Smartcard features

seems to be the OpenPGP applet.Support for smartcard configuration and usage are built in to GnuPG,And the NEO ' s OpenPGP applet works without too much trouble.With the NEO plugged in, all configuration is done through the GnuPG command-line tools.Typing Gpg–card-edit Opens the connection to the card;The Admin command enters configuration mode,generategenerates a key pair, and so forth.Earlier versions of the applet could only generate a new key pairOn the card itself (and could not import an

[Reprint] Three SDR platform comparison: Hackrf,bladerf and USRP

selection, at least, shows that Nuand is not a high-end hardware.Micro ControllerIn addition to the older USRP B100, several other boards have very powerful microcontrollers. B100 uses FX2 to provide USB2.0 connection, only 16KB of RAM. Both Bladerf and b210/200 use FX3, which provides a USB3.0 connection. HACKRF is a dual-core lpc43xx chip that handles the USB2.0 interface and controls the RF chip.The HACKRF microcontroller operates at a 204MHz frequency and is manufactured by

PY Verify Case

# CODING:GBKImport RandomImport stringImport reDef numx ():While 1:#t =re.compile (R ' [A-z0-9a-z] ')N= '. Join (Random.sample (string.letters+string.digits,4)). Strip ('/n '). Replace (', ', ', ')Print nXp=re.compile (' \w+ ', re. I)Rxp=xp.findall (n) [0].upper ()#t1 =t.match (N)#print N.strip ('-')#n. Split ("[', ']")Num1=raw_input (' please input and corresponding verification above:')print ' num1=%s, rxp=%s '% (Num1.upper (), RXP)#if num1.upper ()

View industry changes from bus isolation Products

Starting last year, major IC players have been constantly improving their bus isolation product lines, adi, NXP, Ti, linear, exar and so on all have released magnetic or Optical Isolation RS232, 485, can and other isolation chips. The sensitivity of these vendors to the market is always well prepared three years before large-scale application, from product positioning, R D, testing, market promotion to after-sales services. From the current layout, w

Ocmj8x15b Jinpeng LCD Driver + font Pattern

are interpreted by the program, both the high byte and the low byte minus 160, you can get the Chinese characters you entered. This is very convenient. Here I really want to give NXP some advice. Do you want to use ioset and ioclr for each pin output? This is inconvenient. It is better to output the high level directly than p1.18 = 1. Although this is the 51 SCM method, it is a desirable method and is worth learning, And is the output or input co

Cortex m3 LPC1768 sprintf % f hardware crash reset cause: arm-gcc does not support

I am using NXP cortex-m3 chip LPC1768 as the master chip, after repeated research and experiments, modify startup. the size of stack_size and heap_size in s Code does not help. However, there is a strange phenomenon, that is, the single-step debugging can only be executed once, and the results obtained this time are correct, then there will be a hardware error immediately and an endless loop of hardware errors will be entered into the assembly languag

Android learning note _ 60_Android ADB commands

] exit shellUsing adb shell, cd/system/bin, ls can list most of the available commands.7. VenderID of Some android phones#0x0525 NXP Chip#0x18D1 Broadcom2457 dual-card chip#0x2314 GHT Moke#0x04E8 AnyCall GT-I5508#0x22B8 Moto XT701 XT300#0x0BB4 HTC A8180Part 2:Adb (Android Debug Bridge) is a common tool for Android users. With this tool, we can develop very well. adb.exe is under the android sdk tools directory you have installed,Adb usage:Adb [-d |-e

What is the performance of TCL's flagship mobile phone 950? Performance is tough and sound quality is excellent.

-illuminated lamp, f/2.2 large aperture, 85 degree wide-angle, support 8 filter effects and multilevel beauty. The sound aspect, TCL 950 has 2 nxp smartpa +speaker box sound cavity constructs the stereo field, to the esthetics and the stereo design; The official claim international authoritative audio debugging expert waves debugging, restores the sound original mood. Functional aspects, TCL 950 also has an intelligent Yue key, can be a key to

"Original" Baseband attack: A new approach to smartphone intrusion

. Baseband section is generally for signal processing, generally by the fixed function of the dsp Provides powerful processing power in modern communications devices, dsp It is generally used as speech signal processing, channel codec, image processing and so on. current mobile network is divided gsm , CDMA , cdma-2000 , WCDMA , TD-SCDMA , fdd-lte td-lte production cell phone baseband chip manufacturers mainly include: Qualcomm, Texas Instruments (TI) (ST) Span st

Android Matrix (i): ColorMatrix

coefficients and constants of the square.Like what:      The corresponding matrix array:          What is the use of this matrix array? Do not underestimate the matrix, where the matrix determines whether the equations have a solution, and if there is a solution, what the solution is.In other words, the matrix can be used to solve the linear equations conveniently and quickly.    Second: The operation of the MatrixAddition of matrices:    Multiplication of matrices:    The addition operation co

Forgot BIOS Super Administrator password, how to hack?

the BIOS super password> Tools are all up, where are the chips? Just look at the next few pictures.Chip in the back of the motherboard, in fact, do not have to remove all the original can be turned over the motherboard (I was torn to play, but also for cleaning and silica gel), short-circuit chip pin when the need to power on.Hand grasp the plastic frame to turn the motherboard over, the chip in the red circle position, note the hands do not touch the back of the motherboard those pins.> chip F

[C + +] matrix multiplication, longest common subsequence, maximal sub-Che, longest monotone increment subsequence of dynamic programming

steps are the basic steps of the dynamic programming algorithm;(2) In the case of requiring only the best value, step 4 can be omitted;(3) If you need to ask for an optimal solution to the problem, you must perform step 4.Four, dynamic programming examples1, matrix multiplication problemThe time it takes to multiply the MXN matrix A and the NXP matrix B. We measured the time required to multiply the m x N x p as two matrices.Now suppose to calculate

Mobile Terminal processor composition and baseband chip overview

integrated into the cell phone baseband, and with the integration of analog baseband and digital baseband increasingly becoming a trend, the RF may finally be fully integrated into the cell phone baseband chip. The radio frequency section is usually the part of sending and receiving information. The baseband section is usually the part of the information processing. The baseband chip is used to synthesize the incoming baseband signal, or to decode the baseband signal received. The basic frequen

Why does Samsung want to sell chips? Mobile but Huawei Xiaomi, semiconductor good money!

share in China is now only 2.2%.Previously, Samsung is the world's second largest mobile phone market in India's first brand, currently, Xiaomi has surpassed Samsung in the Indian market, become the market occupies the first mobile phone brand.Why does Samsung want to sell chips? Mobile but Huawei Xiaomi, semiconductor good money!In addition, Samsung's advantage in the semiconductor market is not stable. Andrew Norwood, vice president of Gartner Research, says Samsung is currently occupying the

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