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Pham Ngoc Thanh


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Actif depuis 2013

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How to convert a bit sequence to array?
i have key = 1234; bit_sequence = dec2bin(key); how i convert bit_sequence = 10011010010 to A = [1 0 0 1 1 0 1 0 0 1 0]

plus de 11 ans il y a | 1 réponse | 0

1

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Question


how to repeat a bit sequence?
Hi I have a key =1234; bit_sequence = dec2bin(key); how i create a new_bit_sequence longer by repeating bit_sequence n ...

plus de 11 ans il y a | 1 réponse | 0

1

réponse

Question


How to make a binary sequence bit with given key?
Hi I have a key (ex: key=1234;) how i create a binary sequence bit whose length is 1000 with this key?

plus de 11 ans il y a | 1 réponse | 0

1

réponse

Question


how to encode a bit sequences with key?
how to encode bit sequences with a key, before embedded into an images ( to enhance the secure) , then extracted and decode wi...

plus de 11 ans il y a | 1 réponse | 0

1

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Question


how to convert a grayscale image to binary sequence
I'm research on watermarking. I want to convert a grayscale image MxN pixel (a pixel value 0~255)in to a binary sequence and pe...

plus de 11 ans il y a | 3 réponses | 0

3

réponses

Question


why do when I perform subtraction of two the same matrices is very small results, generally is 1e-016
when I perform subtraction of two the same matrices is very small results, generally is 1e-016, what can i do, If the result les...

plus de 11 ans il y a | 1 réponse | 0

1

réponse

Réponse apportée
how to make a matrix elements randomly distributed
thanks a lot.

plus de 11 ans il y a | 0

Question


how to make a matrix elements randomly distributed
how to make a matrix m elements, which has n elements "one" or #0, randomly distributed, the remaining elements are zero (n<m).

plus de 11 ans il y a | 2 réponses | 0

2

réponses

Question


How to take the value of the array
I have Wj1 = [3x12 double] [3x48 double] [3x192 double] I want to have a matrix [3x252], I make A=[Wj1{1},Wj1{2}...

plus de 11 ans il y a | 2 réponses | 0

2

réponses

Question


how to create a series of changes over the loop variable and can assign a value to it
how to create a series of changes over the loop variable and can assign a value to it Example for r=1:3 A|r| = r ...

plus de 11 ans il y a | 3 réponses | 0

3

réponses

Question


Have problem when learn mex
I'm learning Mex funtion, but when i excute an example mex yprime.c have error: C:\PROGRA~1\MATLAB\R2011B\BIN\MEX.PL: Erro...

presque 12 ans il y a | 1 réponse | 0

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réponse