bit flipping of bits at random positions

[mangood]

Dear members

I have stream of bits for ex. Ten bits generated in serial as follow 

1 0 1 0 0  1 1 1 0

and I want  make a flipping for these bits with specific ratio

for ex. If ratio=0.5 then 5 bits of the above bits stream will flipped (0 to 1 and 1 to 0) and the flipped bits selected at random positions (selected randomly for 10 positions)

for flip I can use xor gate

But for selecting which bits will flipped this is my problem??

any help , idea

best regards

[altenbach]

Do these bits arrive constantly, one at a time? Does the ratio need to be exactly 0.5 or just a 50% probability to flip any given bit. What if the given ratio results in a non-integer number of bits? If you just want to have a certain probability, use the dice and see if the value is >0.5 to decide if to flip or not.

Please provide significantly more information. For example, what is the datatype of these "bits"?

(To process a given series of bits,  you could use the bernoulli noise to generate a 0,1 array of the same lenght and with the desired ones probability. Flip all bits where the output is 1, for example).

[mangood]

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@altenbach wrote:

Do these bits arrive constantly, one at a time? Does the ratio need to be exactly 0.5 or just a 50% probability to flip any given bit. What if the given ratio results in a non-integer number of bits? If you just want to have a certain probability, use the dice and see if the value is >0.5 to decide if to flip or not.

Please provide significantly more information. For example, what is the datatype of these "bits"?

(To process a given series of bits,  you could use the bernoulli noise to generate a 0,1 array of the same lenght and with the desired ones probability. Flip all bits where the output is 1, for example).

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dear thank you for replay i will give here more information  about the case

1- the length of bits is constant and its privousllly known 10 or 20 ....etc.

2- each bit is generated in discrtete  manner (generated serilaay )  each bit will generated at each while loop itration.

3 - datatype of these "bits" are just boolean bits 
4- the ratio is not dice or anything.  Its repersent the nummber of bits that must be flliped 
for ex if bits length =10 and 0.4 ratio its mean that 4 (10*0.4) bits only will flipped

if  ratio 0.9 then 9 bits from 10 will be fliiped 

its simple idea but hard to implement

[altenbach]

Create a I32 array with x ones and N-x zeroes, then apply riffle.vi to randomize the array. Flip the bits of your data for each position that is one.

[mangood]

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@altenbach wrote:

Create a I32 array with x ones and N-x zeroes, then apply riffle.vi to randomize the array. Flip the bits of your data for each position that is one.

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can you show me the vi for this word  ""I32 array with x ones and N-x zeroes""

[ogk.nz]

This is the simplest way I could come up with off the top off my head, I'm sure Alten has a better method as he usually does but this should work.

For the False case simply replace the 1 with a 0

[altenbach · Accepted solution]

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mangood wrote: can you show me the vi for this word  ""I32 array with x ones and N-x zeroes""

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This is a simple task. here are two possibilities (if the ratio of zeroes and ones is fixed, you only need to do that exactly once before the main code loop.