ndvi calculation

derive the "large O-order" first step: "Replace all the addition constants in the runtime with constant 1", then the above calculation becomes:Total number of executions = 2n^2 + 3n + 1;The second step: "In the modified run Count function, only the highest order", where the highest order is n two timesSo the equation becomes:Total number of executions = 2n^2;Step three: "If the highest order exists and is not 1, then the constant multiplied by this i

1, Date object turn timestamp current_day 2, calculates the incremental timestamp, which is the increment of the loop per step one_day 3, loop body calculation, date variable plus increment re-assign value 4, time stamp back to date format output Current_day=2015-07-17 End_day=2014-01-01 #step 1 Timestamp_current=`date -d "$current_day" +%s` Timestamp_end=`date -d "$end_day" +%s` #Step 2 One_day=$((24*60*60)) While [ $timestamp_current -ge $time

Key words and text sets each article relevance calculation: Suppose there are tens of thousands of articles in the corpus, each article length is different, you enter the keyword or sentence, by the code to TF-IDF value to retrieve a high degree of similarity of the article. 1. TF-IDF Overview TF-IDF is a statistical method used to evaluate the importance of a word to one of the files in a set of files or a corpus. The importance of a wo

Python Manual for Function calculation small problemToday, we do this with the Python Starter Manual for function calculations and get stuck with the error. In the introduction to the General entry function for WSGI: { "errorMessage": "'NoneType' object has no attribute 'split'", "errorType": "AttributeError", "stackTrace": [ [ "File \"/var/fc/runtime/python2.7/src/server.py\"", "line 276", "in do_POST", "wsg

int main () { int a = 3; int B = a Today, I looked at the displacement operation, found that good Doboven calculate the displacement of a good complex appearance, wrote to find a small law, I do not know whether it is an existing algorithm (or my guess is not correct), now share, hope you provide comments, suggestions.Take the left displacement as an example (right displacement is not attempted due to time relationship), the above code, a left displacement of 3 bits, I guess the

Algorithm increase date Calculation time limit: 1.0s memory Limit: 256.0MB problem description known November 11, 2011 is Friday, ask yyyy mm month DD is the day of the week? Note Consider the case of a leap year. In particular, every hundred years do not leap, the 400-year leap in the situation. Input format input only one lineYYYY MM DD output format output only one lineW Data size and conventions 1599 1 1 1 #include Algorithm to improve date

Fibonacci Series Calculation B descriptionThe Fibonacci sequence is as follows:F (0) = 0, f (1) = 1F (n) = f (n-1) + f (n-2)Write a function that computes the Fibonacci sequence, using a recursive method to output all Fibonacci sequence elements that do not exceed nCall the function above to complete the following functions:The user enters an integer n, outputs all Fibonacci sequence elements not exceeding n, the elements and averages of the output se

Java floating-point types need to use the JAVA.MATH.* Toolkit, so the results are what we want. Oh1 ImportJava.math.BigDecimal;2 ImportJava.text.NumberFormat;3 4 5 /**6 * Mathematical Calculation class7 * @authorMingge8 *9 */Ten Public classArithutil { One A PrivateArithutil () { - - } the - /** - * Floating-point addition - * @paramNUM1 + * @paramnum2 - * @return + */ A Public Static DoubleAddDo

Addend: 19.36 addend: 601.19 results: 620.5500000000001The debugging process and results are as follows:We found that the multiplication calculation was wrong.Correction methodThere are some versions of the Web that you will find to add tofixed when the results are finally returned, which is a workaround.And since it's a multiplication error, why don't we replace the multiplication with the optimized one. For example, the modified additions are as fo

The same is the use of channels and calculation of skin and whitening, but the author later added a gradient map to enhance skin color contrast, you can better highlight skin texture. Channel and calculation whitening is very classic, if you are not familiar with, you can seriously study the method of this article.OriginalFinal effect 1, open the photo, copy the layer, check the channel, you will find spots

method of using WPS table to calculate function automatically Create a new form, this one will all ha ~ and then open. Where you want to enter the calculation formula, such as: 1+2*3+4*5 First choose the form format "General": Left click on the one you need results: Right---Set cell formatting---general---Click OK Copy command formula "=evaluate ()" .... Move the mouse position to the parentheses of the formula, click the calculated

Using System; Using System.ComponentModel; Using System.Data; Using System.Windows.Forms; Namespace WindowsApplication1 ... {public partial class form1:form ... {public Form1 () ... 　　　　{InitializeComponent (); } private void Button1_Click (object sender, EventArgs e) ... {//system.data.datatable calculation function detailed, reprint please keep the following information//test environment vs2005,c#//Author: jinjazz//author blog:http:// 　　　　　　blog.csd

This article summarizes the problems related to PHP time calculation. Share to everyone for your reference, specific as follows: 1. PHP get three months ago date 2.30 days after the date of calculation You can use strtotime PHP to provide a super simple way to do what would have been dozens of lines of code. First convert a date to a Unix timestamp $t = time (); Current timestamp $t

Today in the project to develop a calculation of the amount of functionality, I started to do this:egvar amount + = parsefloat (0.01+0.02);Results: 0.0300000000000000001Why is it?Search the parsefloat theme:1. The parsefloat () function---Parse string---returns a floating-point number. During the parsing process, I encounteredplus sign (+ or-),Numbers (0-9),Decimal pointIndex in science notation (e or E)　　other than the characters ,It ignores the char

Original: "Unity" Bezier curve about point, length, tangent calculation in Unity C # implementationWrite in frontRecently, a path to the project has been edited, the basic idea is to meet several basic needs:"Additional instructions" in fact this article and this does not matter, you can skip the "write in front" section, cross to the body partWhen editing:① arbitrarily increase or decrease, insert, delete road points, as long as the number of road po

I did not have this concept before I met this question, and I ran into the record;Project JS is used in the number*0.2 (where number is an integer, I test the time is 259), the result is 51.80000000000000004 such a result,At that time directly to force, do not know what reason, readily in Java write a System.out.println (259*0.2), get the same result;At this time it is not the data type of problem, the internet to watch the cause of the great God--------------------------------------------------

Although Gluon provides a large number of commonly used layers, sometimes we still want to customize the layer. This section describes how to use Ndarray to customize a layer of gluon so that it can be called again later.Custom layers with no model parametersLet's first describe how to define a custom layer that does not contain model parameters. In fact, this is similar to using the Block construction model as described in "model construction".By inheriting the Block, you customize a layer that

Simple calculation by using the button for JSSimple calculation by using the button for JS

This article describes how to use Gtest for unit testing.Gtest is the Google Unit testing framework. Very convenient to use.First, download the gtest (some Google projects include gtest, such as Protobuf), and copy the directory to use.http://code.google.com/p/googletest/If the wall, Baidu search, a lot.Unzip the Gtest.zip and get the gtest.1.x.x directory.Export Gtest_home= the DirectoryCompile:CD $GTEST _home/makeMakeRun the sample program and familiarize yourself with the gtest style./sample1

One, time stamp conversion date1 functionformatdate (datetime) {2 //Slice (-2) filters out more than 0 in front of the 10th period when the month day is obtained3 varYear =datetime.getfullyear (),4Month = ("0" + (DateTime.)GetMonth() + 1)). Slice (-2),5Date = ("0" + DateTime.)getDate()). Slice (-2),6Hour = ("0" + DateTime.)getHours()). Slice (-2),7minute = ("0" + DateTime.)getminutes()). Slice (-2),8Second = ("0" + DateTime.)getseconds()). Slice (-2);9 //StitchingTen