fastmod | fast 32-bit division remainders | TCP library
kandi X-RAY | fastmod Summary
kandi X-RAY | fastmod Summary
A header file for fast 32-bit division remainders on 64-bit hardware.
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QUESTION
How to load data into an ArrayList after it's finished loading ?
I am facing the same issue. Log : D/DB: []
https://www.reddit.com/r/Firebase/comments/d1dyd4/androidfirebase_how_to_load_data_into_an/
How can I fix this. Thank you in advance.
...ANSWER
Answered 2021-Feb-05 at 15:57If you run your current code in a debugger and set some breakpoints, you'll see that Log.d("DB", String.valueOf(questions)) runs before any of the questions.add(question). This is because data is loaded from Firestore (and most modern cloud APIs) asynchronously.
All code that needs access to the data from the database needs to be inside the onComplete block. So something like:
QUESTION
I am relatively new to writing apps for Windows IoT. I have a Windows IoT Background app that I want to spawn three separate threads from the main thread. (The reason I want them to all be running in separate background threads is because some of the work they will do could be time consuming so I obviously don't want to block anything).
The first thread is running a small web server.
The second thread is listening to GPIO pins on a Raspberry PI.
The third thread is to listen to devices via I2C.
For some reason, I can't seem to get all three threads to remain open. Here is my code from the StartupTask:
...ANSWER
Answered 2019-Apr-24 at 09:24Based on your update code, although because the while loop in I2C thread prevent the Run method exit, so that local class variables(webserver etc.) will be always valid. And all necessary variables of I2C thread in the while loop so that they will be always valid. But local variables like listener, gpio and gpioPin will be collected by GC then invalid anymore after the method execute complete. Then the thread will exit.
To solve this issue I made some edits to your code and it works. You can have a try:
QUESTION
I've been trying to scan addresses 1-128 on the ports of Raspberry Pi 3 that exist when using I2C. Note that we have 1 GB RAM, and our software always maxes it out especially during this process (actually, it is about 900K, really).
The PlatformOur Operating System: Windows 10 Iot Core Build 17744. Atlas Scientific has sensors for pH, CO2, Temperature, Conductivity and Oxidation/reduction potential (ORP). https://www.atlas-scientific.com/product_pages/circuits/ezo_orp.html Let's assume we are using the Whitebox' Labs Tentacle 3 (we are) to host 3 circuits and sensors and their associated sensors. https://www.atlas-scientific.com/product_pages/components/tentacle-t3.html
Iterating through 1-128 takes 35 seconds, which is impermissible. Also, Python on Raspian doesn't take as long. (I'm going to validate that right now).
What We've Tried1)I noticed the scanning loop was in a static class. I thought "using" would ensure that garbage collection would clear the situation. It didn't.
1a) I rewrote it without "using", but Dispose. Same result;
2) Next I tried the IOT Lightning DMAP driver. https://docs.microsoft.com/en-us/windows/iot-core/develop-your-app/lightningproviders This had no effect on the time either.
Help Me Obi-Wan Kenobi, you're my only hope I've cross posted this to the Windows 10 IOT Support Board. Is it time to try C++?
NoteI've just tried this, but it doesn't seem to work either GetDeviceSelector()..
https://www.hackster.io/porrey/discover-i2c-devices-on-the-raspberry-pi-84bc8b
CodeThere are two versions of FindDevicesAsync (one with and one without Lightning DMAP)
...ANSWER
Answered 2018-Nov-16 at 09:56This result in so much time due to the exception throw then the address "SlaveAddressNotAcknowledged", the time cost depends on the number of the addresses you scan.
To solve this issue you can use WritePartial instead of Write. WritePartial can't result in an exception thrown but report the status code in the return result: I2cTransferResult, I2cTransferStatus. So save the time. Iterating through 1-105 takes about 1.2 seconds.
You can try the following code:
QUESTION
I'm working on a project where I need to be able to update an HTML table, and I would do it through javascript. I have not yet made an HTML site for this project, for I would try to convert a CSV file to a Java array, which would update the HTML table.
I have been trying with papa parse, but it would not work for me. I have no experience with npm and installing and getting stuff to work like Papa parsa. I have found this website, which has a great function to convert CSV to an array. One problem with this function is, that I can't take a local file on the server, and put it into the function as I do with a string. Maybe I have overlooked something?
I have got Papa Parse to work somehow, but I can't figure out how I use it on a local file, so I have two codes for the job, but I don't know how to get them to do it or how good the outcome is.
I just got a random CSV file as a test file. Normal.csv came from papa parse website.
-- to sum up -- I want to take a CSV file, turn it into a Java array, and then make that into an HTML table
Here is my long HTML file, with all scripts - no CSS at this point.
File(s) is being hosted on local Apache/XAMPP server.
...ANSWER
Answered 2018-Nov-04 at 21:09I think your best option is to simplify everything until you figure out exactly what you need. Here is a very basic working Papa.parse. You have no need for the config file unless you are doing something that specifically requires it. Here is a plnkr link
QUESTION
So I have a Arduino and Raspberry pi 3 with windows IoT connected as show in the image below: [][1
I want to read from, and write to, the Arduino slave using the RPI as master with I2C. I have the following code so far:
C# Master:
...ANSWER
Answered 2018-Mar-15 at 02:26I think the issue is due to the missing of Serial.begin,in fact the data sent from master to slaver has been received,just not printed.Please try again with the following code on slaver.
QUESTION
I am using a library called Papa Parse to parse a csv file to json. The parser is working fine, but I cannot call my action creator in the callback function that is specified in the 'complete' section of the config object for Papa parse. I believe this is a scope issue, but I have been unable to resolve it. The main part of interest below is why I cannot call either of the functions in the 'printFile' function, most importantly the 'addRoster' function. Please let me know you have any suggestions or ideas. Thanks!
Edit: Ignore that this is in snippet form. What is here is not runnable, I just couldn't get formatting to work.
...ANSWER
Answered 2017-Dec-22 at 06:52i think you haven't added a constructor so the function was not binded? Try changing this
QUESTION
I have an Arduino Uno and a Raspberry Pi 3 with Windows IoT Core. I've tried to use this method to pass some info to my Arduino, like telling it to initiate a pin or getting and parsing a string. This method works perfectly for getting info from the Arduino (like sensor parameters).
I was able to send a byte to the Arduino and make an action inside my Arduino code, based on the byte sent (like init pin 7 when getting the number 2). BUT it only works once. I have to reset the Arduino so it would accept bytes from the Raspberry Pi again (I can turn on a LED connected to Arduino from my Raspberry Pi but can't turn it of. The reverse is also true.
My goal is to create a web site inside the Raspberry Pi for controlling things. But to start I'm using UWP. I'm trying to pass data from IoT Core running on a Raspberry Pi 3 to an Arduino Uno (not the reverse) or manage and control Arduino Uno pins with an I2C connection.
My MainPage.xaml:
...ANSWER
Answered 2017-Dec-20 at 02:44Raspberry Pi send 4 bytes(2 is Int) instead of 1 byte. You need receive all of the bytes in Arduino. You can do it like this:
QUESTION
I created a small code for testing RSA, but when I try to decrypt a message with keys that are 6-7 digit long, it takes a while and gives me the wrong result.
...ANSWER
Answered 2017-Aug-02 at 03:19A lot of things need improvement, but most notably:
- For RSA encryption/decryption:
fastMod( )should take the modulus as an input parameter, and reduce by the modulus each iteration. I found this code which illustrates the right way to do it. - For parameter generation: In practice, one could never use a function like your
isPrime( )to determine primality because it runs in exponential time. Instead, you should be doing Miller-Rabin / Strong pseudo prime tests, which can usefastMod( )as a sub-routine.
By the way, you are implementing textbook RSA here, which is hugely insecure. You would need to use padding such as OAEP to have security, but you need to be very careful on how you implement that to prevent various forms of attacks (such as side channel attacks).
As for why you are getting the wrong result, it is hard to tell without seeing all of your code. Maybe you want to include a main function that generates params and tries to use them for encryption and decryption.
EDIT: I did notice this which looks suspicious: log = egcd(p, q). Not sure what you are doing here. I suggest you first compute d as the inverse of e mod (p-1)*(q-1) and verify that you are getting that correct (ie multiply d*e mod (p-1)*(q-1) and make sure the result is 1). If so, then do a fastMod( ) with d to see if it decrypts (it should). Once you get that working, then move on to making CRT work.
QUESTION
I have made a custom bow that fires really quickly, and I have learned that all mobs are invulnerable for a short period of time after they get hit. This renders my bow pretty much useless. I was wondering if there is any way to change the duration that the mobs are invulnerable for, or even remove it at all.
Code for bow firing method:
...ANSWER
Answered 2017-May-05 at 17:55You need this:
entityHit.hurtResistantTime = 0;
Note: exact field name may change depending on Minecraft version and the build number of Forge.
Call it either just before you hurt the entity (bypassing the hurt resistance timers inflicted by all other sources of damage) or after (your damage is ignored if there's a timer, but if it inflicts damage, the next source is not ignored due to the timer). This line needs to be in the arrow class. If you don't have a custom arrow class, now's a good time to make one.
There's no (good) way to conditionally set the timer to 0 based on what the prior damage type was, unfortunately. If you are on 1.10 or newer, you could use capabilities, although possibly unwieldy.
QUESTION
I'm using BabyParse to convert a local CSV file to JSON. Here's the js file I've written that does it:
ANSWER
Answered 2017-Apr-17 at 23:44You need to convert your json into a string before you save it.
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