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• Is rand() predictable in C++

  - by singh

  When I run the below program I always get the same values each time. Is rand not a true random function? int main() { while(1) { getch(); cout<<rand()<<endl; } } In each run I am getting the below values. 41 18467 6334 26500 19169 15724 ......

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• How do I randomly select from a list in Python?

  - by Liam Block

  Basically, I've got a homework task of programming a text based battle simulator in Python. Obviously I've gone with pokémon... I would like the enemy to be randomly selected, however I don't know how to randomly select from a list... foo = ['a', 'b', 'c', 'd', 'e'] from random import choice print choice(foo) This is what I've been told to try but I've got no modules or anything imported... How can I make this work, appreciated.

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• is rand() is perdicatable in C++

  - by singh

  Hi When i run below program i always get same values each time..Is rand is not a true random function. int main() { while(1) { getch(); cout<<rand()<<endl; } } In each run i am getting below values. 41 18467 6334 26500 19169 15724 ......

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• Fastest possible summing numbers up to N

  - by dada

  Okay so i need really FAST algorithm or code in C if you have any it would be nice. The task is to sum all numbers from 1 to N for a given number N (it can be negative number too), so i did the usual way (you know just summing with loop from 1 to N) but it's not fast enough - i need something faster, i guess that i need the fastest possible way to do this. If anyone could help me, please do. Thanks.

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• Python: why does `random.randint(a, b)` return a range inclusive of `b`?

  - by David Wolever

  It has always seemed strange to me that random.randint(a, b) would return an integer in the range [a, b], instead of [a, b-1] like range(...). Is there any reason for this apparent inconsistency?

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• How to generate correlated binary variables

  - by jonalm

  Dear All I need to generate a series of N random binary variables with a given correlation function. Let x = {x_i} be a series of binary variables (taking the value 0 or 1, i running form 1 to N). The marginal probability is given Pr(x_i = 1) = p, and the values should be correlated in the following way E[ x_i x_j ] = const * |i-j|^-alfa where alfa is a positive number. Is it possible to generate a series like this? preferably in python.

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• SQL: how to get the left 3 numbers from an int

  - by dmr

  I want to retrieve the left 3 numbers from an integer to be stored in a table. For example, if the int is 1234567, I want to retrieve 123. I want the second number (123) to also be an int; I don't want to convert anything to a string. (And yes, really I should be working with strings. But I don't have control over that aspect of the issue.) Thank you!

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• getting numbers from lines of text

  - by Flethuseo

  Hi everyone, I want to parse a text file, where I get numbers that are between parenthesis like this: 1 2 3 (4 - 7) 8 9 1 3 8 (7 - 8) 2 1 1 2 (8 - 10) 3 2 should return an array for each: array1: 4 7 8 array2: 7 8 10 I am thinking of using split for each line, like line.split("("), but that doesn't quite doing the trick.. I was wondering if there is something more sophisticated for the job. Any help appreciated, Ted

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• MySQL ORDER BY rand(), name ASC

  - by Josh K

  I would like to take a database of say, 1000 users and select 20 random ones (ORDER BY rand(),LIMIT 20) then order the resulting set by the names. I came up with the following query which is not working like I hoped. SELECT * FROM users WHERE 1 ORDER BY rand(), name ASC LIMIT 20

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• code for sorting of numbers in ascending order in visual c++

  - by suman

  i need the code for sorting of numbers in ascending order using visual c++ in the windows forms,the output comes on the forms text box and i am doing it in visual studio.... anyone please help...provide the code

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• how to add lines numbers to : QTextEdit ?

  - by radi

  i am writing a visual basic ide , and i need to add lines numbers to QTextEdit and highlight current line . i have found this tutorial but it is written in java and i write my project in c++ so where to find tutorial like that in c++ , or if there is a ready to use component ? thanks .

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• multiplying big numbers using recursion and array

  - by persian Dev

  hi friends. I am supposed to write and algorithm which uses recursion (Divide-And-Conquer) to multiply two arrays.These arrays hold big Numbers that are greater than long(int 64) or double capacity. Would please help to write this algorithm in C#?

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• Floating point numbers in XML

  - by Jamie

  what is the best way to handle floating point numbers in XML? If I have, for instance: double a = 123.456; and I would like to keep it as <A> 123.456 </A> simply using ... myDoc.createTextNode(a.ToString()); is fine? Or should it be done with some Globalization stuff to make it region-independent?

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• Multi-threaded random_r is slower than single threaded version.

  - by Nixuz

  The following program is essentially the same the one described here. When I run and compile the program using two threads (NTHREADS == 2), I get the following run times: real 0m14.120s user 0m25.570s sys 0m0.050s When it is run with just one thread (NTHREADS == 1), I get run times significantly better even though it is only using one core. real 0m4.705s user 0m4.660s sys 0m0.010s My system is dual core, and I know random_r is thread safe and I am pretty sure it is non-blocking. When the same program is run without random_r and a calculation of cosines and sines is used as a replacement, the dual-threaded version runs in about 1/2 the time as expected. #include <pthread.h> #include <stdlib.h> #include <stdio.h> #define NTHREADS 2 #define PRNG_BUFSZ 8 #define ITERATIONS 1000000000 void* thread_run(void* arg) { int r1, i, totalIterations = ITERATIONS / NTHREADS; for (i = 0; i < totalIterations; i++){ random_r((struct random_data*)arg, &r1); } printf("%i\n", r1); } int main(int argc, char** argv) { struct random_data* rand_states = (struct random_data*)calloc(NTHREADS, sizeof(struct random_data)); char* rand_statebufs = (char*)calloc(NTHREADS, PRNG_BUFSZ); pthread_t* thread_ids; int t = 0; thread_ids = (pthread_t*)calloc(NTHREADS, sizeof(pthread_t)); /* create threads */ for (t = 0; t < NTHREADS; t++) { initstate_r(random(), &rand_statebufs[t], PRNG_BUFSZ, &rand_states[t]); pthread_create(&thread_ids[t], NULL, &thread_run, &rand_states[t]); } for (t = 0; t < NTHREADS; t++) { pthread_join(thread_ids[t], NULL); } free(thread_ids); free(rand_states); free(rand_statebufs); } I am confused why when generating random numbers the two threaded version performs much worse than the single threaded version, considering random_r is meant to be used in multi-threaded applications.

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• C Macro for minimum of two numbers

  - by VaioIsBorn

  I want to make a simple macro with #define for returning the smaller of two numbers. How can i do this in C ? Suggest some ideas, and see if you can make it more obfuscated too.

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• SQL Randomization on Daily Basis

  - by mouthpiec

  Hi, I have an SQL listing shops, but i would like to random the results on a daily basis. For example today I list bat 2, 6, 9 etc and tomorrow, 6,1,7,9 etc Is there a way to implement this?

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• What these numbers mean in Kannel SMSC logs?

  - by Hashmi

  What does these numbers represent ? What does their mean ? 2013-06-27 10:39:42 [9446] [6] DEBUG: SMPP PDU 0x7f8364000a50 dump: 2013-06-27 10:39:42 [9446] [6] DEBUG: type_name: enquire_link 2013-06-27 10:39:42 [9446] [6] DEBUG: command_id: 21 = 0x00000015 2013-06-27 10:39:42 [9446] [6] DEBUG: command_id: 21 = 0x00000015 2013-06-27 10:39:42 [9446] [6] DEBUG: command_status: 0 = 0x00000000 2013-06-27 10:39:42 [9446] [7] DEBUG: SMPP[mvoip]: Got PDU: 2013-06-27 10:39:42 [9446] [6] DEBUG: sequence_number: 519338176 = 0x1ef478c0 2013-06-27 10:39:42 [9446] [6] DEBUG: SMPP PDU dump ends.

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• PHP regex:Find all 6 digit numbers in a string that do not end in 00

  - by Argiropoulos Stavros

  Hello all I'm trying to find all the 6 digit numbers in a string that do not end in 00. Something like that /([0-9]{4})([^00])/ //i know this is wrong so the string asdfs dfg_123456_adsagu432100jhasj654321 will give me results=[123456,654321] and not 432100 Thanks Have a good day

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• storing numbers as varchar

  - by Yeti

  Is it ok to store numbers as varchar? What's the difference between int 123456789012 and varchar 123456789012 ?

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• Sorting string column containing numbers in SQL?

  - by Ish

  Dear Folks, I am trying to sort string column (containing numbers). // SELECT `name` FROM `mytable` ORDER BY `name` ASC +----------+ +-- name --+ +----------+ +-- a 1 ---+ +-- a 12 --+ +-- a 2 ---+ +-- a 3 ---+ You see natural sorting algorithm of Mysql is placing a 12 after a 1 (which is ok for most apps), But I have unique needs, so I want result should be sorted like this. +----------+ +-- name --+ +----------+ +-- a 1 ---+ +-- a 2 ---+ +-- a 3 ---+ +-- a 12 --+ Is it possible with just SQL, or I have to manipulate result-set at application level? Thanks for reading...

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• LaTeX, Two columns, Listings and Numbers

  - by Valdor65

  Hi, I'm trying to get a report done and I have a small problem with the twocolums and the line numbering in listings. The text is on two columns, the listings can be on the two columns as well. If I put the number=left, the space between the columns is not sufficient and the text from the first column is written over. Is there any way to ask the listings to put the line numbers "outside" ? Thanks

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• How could I generate instances of an object randomly at the top of the screen and make them "fall"?

  - by Custard

  I am making a game in Flash CS4 (actionscript 3) and I would like to be able to make "copies" of an instance that would randomly appear at the top of the screen and fall. For example, multiple objects(that are the same one) are falling from the top of the screen continuously, starting at random X positions. (i think this would be considered Real-Time effect). P.S., please tell me if the information is insufficient for an answer, I couldn't think of much more to add to it. Thanks for your time and answers, -Custard

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• c# Regex question: only letters, numbers and a dot (2 to 20 chars) allowed

  - by Michel

  Hi, i am wrestling with my regex. I want to allow only letters and numbers and a dot in a username, and 2 to 20 chars long I thought of something like this [0-9a-zA-Z]{2,20} but then 21 chars is also ok, and that's not what i want

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• how to add Line-numbers to uitextview?

  - by pbcoder

  I want to add line-numbers to my uitextview. Do I have to write my own UI-Element? Or is there an other solition? Thanks for help!

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• To create a large file consisting of strings and numbers in c or c++

  - by Eternal Learner

  Hi All, I need to create a larger file, which would be filled by strings and numbers of a certain length. Eg File content would be like : Dougan | 15 | Sapient Patric | 25 | Patni. IGHIGH | 10 | IHIUDWHKJDBHKJ I need an outline as to how I can approach this in either c or c++.. Kindly let me know if more information is needed.

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