grepl function in r

The floor function and the Ceil function match each other to make PHP processing data more authentic and reliable. First, look at the floor function: Grammar: Float floor (float value) Description Returns the next integer not more than value, rounding out the decimal part of value. The type returned by floor () is still float, because the float value is usua

Query a comma-delimited field, you can use the String function Find_in_set ();Query a field in a database table (the value is displayed as a branch), you can use function in ().Today's work encountered a problem, is to use the Find_in_set () function to solve.The first part:Find_in_set () function usage,Query a comma-d

Reprint ------------ memcpy () function usage of C function, memcpy function usage Reprinted on http://blog.csdn.net/tigerjibo/article/details/6841531 Function prototype Void * memcpy (void * dest, const void * src, size_t n ); Function Data of n consecutive bytes directed b

#include 6 1 0 0 0 5 "Mastering" the array name as a function parameter#include voidChangeintarr[2]){ //test, print the value of arrprintf"arr =%p\n", arr); arr[0]= -;}voidtest1 () {inta[2]={1,2}; printf ("A =%p\n", a); //a 0x7fff5fbff7c0//using the array name as the function parameter, the address is passed//The argument is the array name a, and the parameter is arr//At this point A and a

This article mainly introduces PHP ADODB generated HTML table function rs2html function, combined with instance form analysis PHP using ADODB class using function rs2html output result set HTML table related operation skills, and with error handling function errormsg usage, A friend you need can refer to the following

Transmission DoorWhen looking at the code of the big guy, I met the unique function and the lower_bound and upper_bound functions of the binary lookup, so I wrote this article to record it for review.Unique functionIn STL, the unique function is a deduplication function, the unique function is to remove the adjacent re

Checkdate: Verify the correctness of the date. Date: Format the time of the server. Strftime: The time of the server is formatted locally. GETDATE: Get time and date information. Gettimeofday: Get the current time. Gmdate: Gets the current time after the difference with GMT. Easter_date: Calculates the Easter date. Easter_days: Calculates the number of dates between Easter and Marc

/*3. Use the function to implement the login function (three chances), and then judge the function based on the called result.Login successful or not.*/# Include Int numb (char use [], char password []){If (strcmp (use, "Zhouyi") = 0) (strcmp (password, "Nb") = 0 )){Return 1;}Else{Return 0;}} # Include Void main (){Char name [100] = "0 ";Char Mima [100] = "0 ";

Php user-defined function for two-dimensional array sorting function, two-dimensional array sorting Function This article describes how php user-defined functions can sort two-dimensional arrays. We will share this with you for your reference. The details are as follows: /** Function: Two-dimensional array sorting

PHP file operations, multiline sentence reading, file () function, file_get_contents () function, file_put_contents () function, is_file, statistics of website pv (traffic volume), file copy, rename the file, delete the file unlink, Add UTF-8 to php: 1 header ("Content-type: text/html; charset = 'utf-8 '"); File Operation steps: 1. Create a file.txt folder under

Original address: http://blog.csdn.net/caroline_wendy/article/details/23383995static functions (Staticmethod), class functions (Classmethod), differences in member functions (fully parsed)Defined:static function (@staticmethod): A static method that deals primarily with the logical association of this class, such as validating data;class function (@classmethod): A class method that focuses more on invoking

In some cases, we may want some code in the program to execute first, then stay n seconds before executing other program code, but the content that JS writes to sequentially executes once, even if use a big loop (like while (iUsing the SetTimeout function we can easily complete the above problem, we can write a () clock to delay the execution of the code written to a function such as B1 () clock, and then t

One, sum over Sum over is primarily used to incrementally add a field value and to sum it continuously SELECT Name, Salary, SUM (Salary) over (order by Salary, Name) subsal From EMP Order BY Salary; Name, Salary, age a,900, 20 b,900, 21 c,1000, 18 d,950, 20 Post-execution format Name, Salary, subsal A, 900, 900 B, 900, 1800 D, 950, 2750 C, 1000, 3750 SUM (SAL) over (partition by Deptno)--a continuous summation of departmental employees ' wages, grouped by department Partition by is a g

A few days ago to do projects, using these functions, here to summarize, deepen learning comprehension:1. Split() function to split a string into a string array Usage:stringobject.split (separator,howmany);The first parameter, which is required, is a string or regular expression that represents the partition of the Stringobject from the location specified by the parameter .The second parameter, which is optional, returns the maximum length of the arr

[C Language] compile a function reverse_string (char * string) (Recursive Implementation) to sort the characters in the parameter string in reverse order. You cannot use the string operation function in the C function library ., C Standard Library // Write a function reverse_string (char * string) (Recursive Implement

For example, function: def A (x): def B (y): Return x + y return B. The last return B function has no parentheses, but the function runs normally, when a (2) (3) is called like this, the value can be calculated normally. What is the returned B? What should I do? In addition, when a (2) is missing a parameter call, it is useless and does not cause an exception. Ho

The use of each function in jquery looks almost the same as the map function, but there is a difference. One important difference is that each returns the original array, and no new array is created. The map method returns a new array. If you use a map if it is not necessary, you can create a waste of memory. e.g. var items = [1,2,3,4]; $.each (items, function