Questions tagged [binary]
The binary tag has no usage guidance.
70
questions
1
vote
0answers
38 views
How to recover plaintext from .MX files?
I need a function to deserialize the contents of an MX source file for reading. We can’t simply use Get because I don’t want to load or run the code, but rather to ...
12
votes
0answers
383 views
Why does Mathematica consume so much memory when reading binary data?
There are somewhat similar questions on here, but I didn't find a satisfying answer for this case: I import a 1.7 GB binary data file using the following command:
...
1
vote
1answer
52 views
Why ImportByteArray when generate image from bytes
I was trying to generate an image from a list of bytes so I only had to Import an Image once as I want to store a Base64Encoded ...
3
votes
0answers
31 views
Does NumericArray always maintain data unmodified?
Suppose that we create a NumericArray using a LibraryLink function, then pass this to another one. Is NumericArray guaranteed to maintain the binary data as it was ...
3
votes
1answer
133 views
Read NumericArray from a file
Suppose I have a binary file which consists of a list of integer or real numbers. Let's say signed 8-bit integers; so each byte of the file is a single such integer. How can I read it and turn it into ...
4
votes
1answer
104 views
Something is wrong with the implementation of the ThueMorse function
While trying to answer this Math.SE question, I believe I found several bugs in Mathematica and Alpha relating to the Thue-Morse sequence.
As a quick reminder, the $n^{\rm th}$ element of the Thue-...
7
votes
4answers
689 views
BitNot does not flip bits in the way I expected
Can anyone explain why the last result in these statements is not the bit-flipped version of arr?
...
3
votes
0answers
159 views
How to import a binary data generated by Fortran? [closed]
I have a unformatted binary data file generated by gfortran. However, when the binary data is imported by Mathematica, a correct result is not obtained.
This is my fortran code:
...
2
votes
2answers
98 views
Listing all monotone increasing binary digits
For $n=5$, I have $32$ binary digits and for this there are $2^{32}$ combinations. Out of this many, the interesting ones (i.e., the ones that have monotone increasing binary digits) are only about "$...
1
vote
2answers
71 views
Number of contiguous ones of an element in a 2d binary array
I have a 2d binary array of 0s and 1s. I select an element and would like to know how many 1s are in the contiguous cluster that includes the selected point. If the selected element is 0, the answer ...
0
votes
1answer
318 views
Using the binary search algorithm in a sorted grid
I want to get a mathematica code for binary search algorithm applied to a sorted grid containing integers.
For example, given
f[k_,x_]= x^2 + k x + k - 2
where <...
4
votes
1answer
554 views
How to read this dataset with .dat and .r64 files?
I stumbled upon the European Data Incubator project, and wanted to play around with some of their data. I'm trying to open this dataset, which contains a bunch of ...
2
votes
0answers
269 views
Converting hex string to ByteArray
With blockchain support, it should finally become straightforward to convert string hashes to ByteArray, but I still can't figure out the canonical Wolfram way of ...
2
votes
1answer
142 views
Generate a prime number in a range with fixed $n$ most significant bits
I'm new to Mathematica so my question might be trivial.
How do I generate a $200-bit$ prime with the condition that the 10 most significant bits in its binary representation are equal to some binary ...
4
votes
4answers
702 views
How to total the amount of zeros in a binary matrix
I have a 150 by 300 binary matrix. I would like to find the total amount of zeros in the matrix. I've been consulting online documentation for support, but am unable to use the "count" function ...
1
vote
0answers
58 views
Efficiently transform sequentially generated integer matrices into boolean matrices
Assume you have a list of 5 numbers, eg L = {14, 7, 11, 14, 0};.
Now, what you want to do with this list, is to transform each entry into eg a binary list, using <...
6
votes
1answer
194 views
Is it possible to convert the output of the Encrypt[] function into binary digits?
I use the following code to generate a key and then use it to encrypt a simple string message. The output of the function Encrypt is an encrypted object. But I would rather convert this into binary ...
1
vote
0answers
173 views
The binary of negative integer number
I have a question about the binary of negative integer number in Mathematica.
In most implementations, negative signed integers are stored in what is called two's complement. The other major way of ...
2
votes
1answer
76 views
Convert Negative Integers into Signed Binary?
I'm relatively new to Mathematica and have been struggling with this problem for several days.
I have a string of integer data, ranging from -2044 to 2044. So this looks something like {-2044,-2040,-...
3
votes
1answer
154 views
Convert characters to binary?
I can get a binary representation of characters as follows:
BaseForm[ToCharacterCode["A"], 2]
However, that produces a weird binary code object that might be ...
9
votes
8answers
582 views
How to find the sum for each individual row in a binary matrix until the first zero is reached from left to right.
I have a 150 by 300 binary matrix. I would like to sum the 1's for each individual row (from left to right) until the first zero is encountered. For example, if a given row is 1 1 1 1 1 1 0 0 0 1 0 0 ...
10
votes
5answers
889 views
Substitute some 1s with 0s in random list
How is it better to substitute list of random combination of 1 and 0 (binary image) so that only first (or central) instance of 1 left in each group.
...
5
votes
2answers
310 views
Printing binary numbers with extra zeros
I have the numbers $0-64$ in binary and want them all to be displayed with 8 figures.
Expected output:
$5_{10} = 101_2$ should become 00000101.
1
vote
0answers
43 views
Binary Image Size after import
I have a lot of binary images I would like to import into mathematica.
Each of them is 132kB (1024x1024) big. Like the following:
As soon as I import it into Mathematica however and call ByteCount[...
1
vote
0answers
53 views
Export 1bit Image
I have a binary image like the following one:
How can I export it as an 1bit image instead of an 8bit one?
If I export it in tiff it automatically becomes an 8bit one.
Best,
Max
0
votes
5answers
111 views
How to find all binary numbers with the kth =0 and smaller than 2^n?
I have been stuck in this problem for a long time.
I need to find a general code to collect all binary numbers which are at most n digits (<2^(n-1)) with the ...
5
votes
1answer
262 views
Decoding GZIP encoded Body, BodyBytes (ByteArray) and BodyBytesArray from URLRead
When calling the Stack Exchange API v2.2 using the new (Mma11) function URLRead we get a GZIP encoded Body in alternative formats: ...
10
votes
1answer
201 views
Performance-driven approach to using Big Data without killing the hard-drive
Situation
A calculation has to be done in which the amount of data is too much to fit into memory. Fortunately, only a part of the overall data set has to be known at a time. The preprocessing is ...
1
vote
1answer
145 views
Generate a list of randomly distributed $1$s and $0$s with fixed proportion of $1$s [duplicate]
I need to simulate a random initial state of an 1D cellular automaton, but with different 'densities' of filled cells.
Let's say the size of the list is $N$, then I need to be able to fix a number $P$...
7
votes
3answers
351 views
Reading a file as a ByteArray?
I want to read in large files as byte strings.
Import[..., "Byte"] yields a list of Integers that takes up much more space (16 times more) than the file.
...
1
vote
0answers
137 views
How can I import Real16 binary data? BinaryReadList doesn't work [closed]
How can I import Real16 binary data? BinaryReadList doesn't work:
...
-1
votes
1answer
95 views
Turn binary number into string of words [closed]
I don't actually have any code for this, as I have no real idea how to do it. I have a large binary number combination that I know turns into some sort of string. How would I go about translating it?
1
vote
1answer
372 views
How to visualize .data files? [closed]
I am working with simulation models trying to carrying out some predictions in ocean waves and this stuff. (MITgcm)
I am able to run the program and generate hundreds of .data and .meta files, but i ...
1
vote
2answers
87 views
How to replace the selected value in matrix with a specific digit?
I want to replace the selected values through "RandomChoice" by 1 and all other values in matrix with 0. I want output in binary form matirx.
...
6
votes
1answer
542 views
How do I directly read the Nth byte from a binary file?
I have a very large binary file (several hundred GB) which I would like to process using Mathematica. I only need to process a few bytes of this file at a time, and I know in advance which bytes I ...
7
votes
2answers
399 views
Infinite base two number to base ten
Suppose I have a base two number that repeats itself every five places (a number $x$ such that $0\le x<1$. For example:
$$x=0.101011010110101101011010110101101011010110101...$$
What would be a ...
3
votes
1answer
190 views
Binary decision diagrams (BDD) syntax error
I am new here (and to Mathematica) and would like to rebuild a simple binary decision diagram that I found here https://en.wikipedia.org/wiki/Binary_decision_diagram
A code has been provided as part ...
2
votes
1answer
94 views
Interpret hexadecimal sequence as a binary matrix that can be used in AdjacencyGraph
I have a database of hex sequences stored as blob.
Each of them is a binary matrix representing the adjacency matrix of a directed graph.
I want to use the ...
7
votes
1answer
355 views
HMAC implementation in pure Mathematica
I am trying to implement the HMAC algorithm in Mathematica. The algorithm is a relatively simple way of signing messages with a key.
Here is some pseudocode from Wikipedia:
My attempt:
...
4
votes
1answer
147 views
Importing binary structured C++ data file
I am trying to import a binary data file. It seems that BinaryReadList would be appropriate? However the data file is composed of c++ structures like this:
...
3
votes
1answer
141 views
updating matrix elements based on a condition
I am (still) fairly new to Mathematica and trying to perform some operation on the matrix elements, say for the matrix
...
0
votes
1answer
39 views
How can I apply a matrix 2*2 to binary digits? [closed]
I want to apply a matrix 2*2 to a binary digits.
For example, D and E are two matrices that they apply to a 1 and 0.
D --> 1 & E --> 0
binary digits: (1011) --> D.E.D.D
7
votes
2answers
1k views
How to do binary calculation？
For example, $a=0.10101$ in binary representation.
Then how to calculate $a^2$ directly in mathematica?
Is there any function turning binary into decimal? I only found its inverse...
2
votes
1answer
252 views
BinaryWrite negative numbers [closed]
testList = {1, 2, 3, 4};
file = "test1";
BinaryWrite[file, testList];
BinaryReadList[file]
Close[file];
Gives
{1, 2, 3, 4}
...
21
votes
1answer
828 views
Faster binary Hamming weight for big integers?
While working on an answer to Count the sequences in an array I found that DigitCount was the bottleneck in my code when used as ...
2
votes
1answer
92 views
Recurrence relation for multivariate polynomials
I am trying to define a function which recursively computes a polynomial associated to every binary string:
ComputePoly[s_]:=(** Recurse on the string s**)
For ...
0
votes
2answers
114 views
Troubleshooting Program Meant to Swap Elements
I wrote a program that is supposed to take a list (of arbitrary length) of pairs of the digits of binary numbers (e.g. ...
3
votes
1answer
794 views
Binary file gymnastics
I have an unformatted binary file generated by fortran 77 and i want to import it in Mathematica. The file is formed by 5 data arrays with double precission float numbers. The problem is that seems ...
5
votes
0answers
71 views
How to force the writing of buffers onto disk?
Usually, buffering is good; except when you critically need to write data to disk. Is there a way to force the writing of buffers onto disk? (I'm using a binary file)
I believe a ...
2
votes
2answers
415 views
Generating b/w bitmaps from a binary sequence
I would like to make a bitmap that visually represents a binary sequence, something like this:
Where for example the 1's become a black pixel and the 0's a white one. I have never done something ...
