How do fill an array with 7-bit, size int values, using random number generator in C?
void loadbytedata(char mem[], int size);
I'm trying to compile it through Linux Terminal. More details in the comment below.
mercredi 20 mars 2019
Fill an array with 7-bit, size int values, using random number generator
How to calculate a random place on a circle using Java
I am making two circles using Java, one on the other, so it looks like this:
I would like to generate a rectangle randomly on the circle, in a way that it would go on the brown part of the circle, but not on the white circle. I think it may require a bit or trigonometry. Can someone provide sample code that would allow me to do this?
Thanks
List of 10 random points between -2 and 2 with uniform distribution
How do I make a list of 10 random points between -2 and 2 with a uniform distribution? Python keeps telling me that the range is negative or too small
This is what I have so far:
import random
randint = random.uniform((1, 10),10)
print (randint)
Random numbers with different probability of ocurring
I'm simulating a problem in Excel to prove my theoretical result.
I have a total number of customers, let's say n = 80. 40% of this group is female and 70% is of the age from 40 to 60. On paper, if I want to get a group of female that is of the age from 40 to 60, I can just multiply 0.4 * 0.7 * 80
However, I'm running a Monte Carlo simulation on Excel, so the sex and the age have to be random here. I can't figure out how to "simulate" the 40% and 70% here. For example, if I do rand() and take 1 for male and 0 for female, that would give 50% female though right?
Can I get help with this please?
Create a list of random integers and then put all numbers that are the same right beside eachother
def run():
lst=[]
for i in range(0,20):
ran = random.randint(1,10)
lst.append(ran)
return lst
So far I have created a list of random integers from 1 to 9 with 20 values, however how can I incorporate a swapping method so that values that are the same but not next to eachother will be next to eachother?
Thanks
How can I get a random number generated in a CTE not to change in JOIN?
The problem
I'm generating a random number for each row in a table #Table_1 in a CTE, using this technique. I'm then joining the results of the CTE on another table, #Table_2. Instead of getting a random number for each row in #Table_1, I'm getting a new random number for every resulting row in the join!
CREATE TABLE #Table_1 (Id INT)
CREATE TABLE #Table_2 (MyId INT, ParentId INT)
INSERT INTO #Table_1
VALUES (1), (2), (3)
INSERT INTO #Table_2
VALUES (1, 1), (2, 1), (3, 1), (4, 1), (1, 2), (2, 2), (3, 2), (1, 3)
;WITH RandomCTE AS
(
SELECT Id, (ABS(CHECKSUM(NewId())) % 5)RandomNumber
FROM #Table_1
)
SELECT *
FROM RandomCTE r
INNER JOIN #Table_2 t
ON r.Id = t.ParentId
The results
Id MyId RandomNumber
----------- ----------- ------------
1 1 1
1 2 2
1 3 0
1 4 3
2 1 4
2 2 0
2 3 0
3 1 3
The desired results
Id MyId RandomNumber
----------- ----------- ------------
1 1 1
1 2 1
1 3 1
1 4 1
2 1 4
2 2 4
2 3 4
3 1 3
What I tried
I tried to obscure the logic of the random number generation from the optimizer by casting the random number to VARCHAR, but that did not work.
What I don't want to do
I'd like to avoid using a temporary table to store the results of the CTE.
How can I generate a random number for a table and preserve that random number in a join without using temporary storage?
SecureRandom locking NativePRNG on jsch
I have an application on production that creates about 150 threads that complete in about 45 seconds. Recently we started to have memory problems. Turns out that threads never complete and add up over time because of locked NativePRNG.
We only have that problem for our test/backup machine. Production machine runs the same jar without a problem.
Here's the stack trace of a thread
"VSGADNE01" #923 prio=5 os_prio=0 tid=0x00007f7698e41800 nid=0x2b32 runnable
[0x00007f7601ac3000]
java.lang.Thread.State: RUNNABLE
at java.util.Arrays.copyOfRange(Arrays.java:3520)
at sun.security.provider.NativePRNG$RandomIO.implNextBytes(NativePRNG.java:553)
- locked <0x00000005cdf9c660> (a java.lang.Object)
at sun.security.provider.NativePRNG$RandomIO.access$400(NativePRNG.java:331)
at sun.security.provider.NativePRNG.engineNextBytes(NativePRNG.java:220)
at java.security.SecureRandom.nextBytes(SecureRandom.java:468)
at com.jcraft.jsch.jce.Random.fill(Random.java:78)
at com.jcraft.jsch.Packet.padding(Packet.java:59)
- locked <0x00000005cde992d0> (a com.jcraft.jsch.jce.Random)
at com.jcraft.jsch.Session.encode(Session.java:885)
at com.jcraft.jsch.Session._write(Session.java:1366)
- locked <0x000000064974f720> (a java.lang.Object)
at com.jcraft.jsch.Session.write(Session.java:1335)
at com.jcraft.jsch.ChannelSftp.sendPacketPath(ChannelSftp.java:2575)
at com.jcraft.jsch.ChannelSftp.sendPacketPath(ChannelSftp.java:2559)
at com.jcraft.jsch.ChannelSftp.sendCLOSE(ChannelSftp.java:2538)
at com.jcraft.jsch.ChannelSftp._sendCLOSE(ChannelSftp.java:2464)
at com.jcraft.jsch.ChannelSftp._get(ChannelSftp.java:1155)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:961)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:873)
at com.ngss.vodafone.oss.ebm.Controller.SftpUtils.getFiles(SftpUtils.java:141)
at com.ngss.vodafone.oss.ebm.Controller.SftpUtils.download(SftpUtils.java:187)
at com.ngss.vodafone.oss.ebm.Controller.Host.downloadFiles(Host.java:108)
at com.ngss.vodafone.oss.ebm.Controller.Host.run(Host.java:86)
at java.lang.Thread.run(Thread.java:748)
Things that i tried with no success:
- Setting securerandom.source=file:/dev/./urandom in java.security
- Running the jar with option -Djava.security.egd=file:/dev/./urandom
- Linking /dev/random to /dev/urandom
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