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Questions tagged [parity]

A parity bit, or check bit, is a bit that is added to ensure that the number of bits with the value one in a set of bits is even or odd. Parity bits are used as the simplest form of error detecting code.

A parity bit, or check bit, is a bit that is added to ensure that the number of bits with the value one in a set of bits is even or odd. Parity bits are used as the simplest form of error detecting code.

There are two variants of parity bits: even parity bit and odd parity bit. In case of even parity, the parity bit is set to 1, if the number of ones in a given set of bits (not including the parity bit) is odd, making the number of ones in the entire set of bits (including the parity bit) even. If the number of ones in a given set of bits is already even, it is set to a 0. When using odd parity, the parity bit is set to 1 if the number of ones in a given set of bits (not including the parity bit) is even, keeping the number of ones in the entire set of bits (including the parity bit) odd. when the number of set bits is odd, then the odd parity bit is set to 0.[1]

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How to fix the trait `parity_scale_codec::codec::WrapperTypeEncode` is not implemented for `Hash`

I am trying to define Substrate runtime-api. I am using substrate master branch for dependencies. Here is code #![cfg_attr(not(feature = "std"), no_std)] use codec::Codec; use codec::{Encode, Decode}; sp_api::decl_runtime_apis! { /// The API to…
Ayush Mishra
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Blocks are not being finalized in a private network

I am following the tutorial on running a basic 2 node private network in substrate. I have used subkey to generate aura and grandpa keys for both of the nodes and added the keys to keystore. I thought I did everything correctly, both of the nodes…
beqaabu
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Websocket connection for nginx and parity?

I am running a dAPP on a cloud server and using nginx and parity client with wesocket enabled on it. I installed a certbot certificate for the https domain. Now i am having problem that while accessing my website using https it gives an error on…
Hsn
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Parity upgrade error parity: /lib/x86_64-linux-gnu/libcrypto.so.1.0.0: version `OPENSSL_1.0.2' not found (required by parity)

I am using ubuntu 14.0 system, parity version 1.9.7 when upgrading the ethereum parity node. An error occurred. parity: /lib/x86_64-linux-gnu/libcrypto.so.1.0.0: version OPENSSL_1.0.2' not found (required by parity) parity:…
Feifei Zhao
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How to get Web3js to work inside a VueJS component?

I want to use web3 with node and vuejs to connect to an Ethereum Parity node. I am using vue-cli with webpack. Parity is running on localhost. When I visit http://localhost:8545 I see which tells me Parity is listening. I created the following…
nu everest
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How to XOR all of the bits of a single number in C?

Is there a simple way to XOR all of the bits of a single number together, i.e. a unary XOR in C? Something that has the effect of: result = ^(0x45); // ( 0 ^ 1 ^ 0 ^ 0 ^ 0 ^ 1 ^ 0 ^ 1 = 1) result = ^(0x33); // ( 0 ^ 0 ^ 1 ^ 1 ^ 0 ^ 0 ^ 1 ^ 1 = 0)
user2600959
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Generate a Generator Matrix from a ldpc parity check matrix

I have generated a LDPC parity check matrix using Gallager approach for n = 20 , j = 3 and k = 4. The parity check matrix is defined by: The problem is, I don't know how to proceed further to generate the codeword for which I'll need the generator…
Dhanush
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STM32F427's USART1 sometimes sets 8th data bit as if it would be parity bit

I'm working with STM32F427 UASRT1 via the following class: void DebugUartOperator::Init() { // for USART1 and USART6 ::RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); // USART1 via PORTA …
Victor Che
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CRC/Parity/Hamming Protect 16-bit parallel bus

I've got a Cortex-M4 based MCU linked to a FPGA via a 16-bit parallel memory bus interface. In essence the FPGA behaves like an external memory mapped to the memory space of the MCU: the MCU presents an address followed by either a data word (write)…
Arne
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RS232 word size with or without parity

The bytesize attribute in the serial class is defined as being the number of data bits used for that connection. If I enable odd parity, does it convert one of the defined data bits to signify parity? Or does it just add another bit between the…
user611726
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Counting Set Bits. 16-bit assembly parity program

I am trying to write a subprocedure that will count the number of buts set in a 16bit number, then send that number (bits set) back to the main procedure in AX. The main should display display the number of 1s and determine if the number is even or…
John Smith
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Zero out characters with even number of set bits, and reverse string

I am not able to finish given task using DOS Debug: Every input string symbol, that has even number of bits has to be changed to 0. And then string has to be reversed and printed to the screen. a200 db 50 a260 db 'Enter string' 0d 0a '$' a100 mov…
user10203585
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Generated code hash at ink smart contract deployment

After placing an ink! smart contract on canvas-node using https://paritytech.github.io/canvas-ui, what does the created code hash represent and what is it used for?
user15205786
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Change the minimum number of entries in an array so that the sum of any k consecutive items is even

We are given an array of integers. We have to change the minimum number of those integers however we'd like so that, for some fixed parameter k, the sum of any k consecutive items in the array is even. Example: N = 8; K = 3; A = {1,2,3,4,5,6,7,8} We…
emeralddd
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ARM parity of low 8 bits of a register

I have found a few difficulties with the assembly language and unfortunately when I search the google for information I can't find anything that helps me with my problem. I have written this code and I'm looking for help to see if there's a way to…
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