Question

Reading text file word by word

Input is the attached text file, with one long word, a newline, then several equal-length short words separated by white spaces....

environ un an ago | 2 answers | 0

Question

Inverse of sorting arrangement

[B,I] = sort(A) output is such that B = A(I). What would be the most efficient way to rather get B and J, such that A = B(J)?

environ un an ago | 2 answers | 0

Question

fprintf is printing strange characters instead of numbers

I want to print a vector of unsigned integers to a text file, with a space between each number. But the file I get is just weird...

environ un an ago | 1 answer | 0

Question

How can you visualize graphs with string-labeled edges?

With the _biograph_ function you can generate a graph object, which you can then visualize with the _view_ function. But it seem...

plus d'un an ago | 0 answers | 0

Question

Faster alternative to containers.Map

Profiling a script (attached, along with a sample input data file), I have found that looking up a Map generated with containers...

environ 2 ans ago | 1 answer | 0

Question

Speeding up dynamic programming code

Is there a way to speed up this piece of code implementing a dynamic programming algorithm? % sample input v = repmat('C...

plus de 2 ans ago | 0 answers | 0

Question

Count common elements of two vectors, including repeats

I would like to count the common elements of two vectors a and b of integers, including repeats. For example, for: a = [9 1...

plus de 2 ans ago | 1 answer | 0

Question

Generate neighbors of a string

I need to generate a cell array (or char array) containing all d-neighbors of a string of lenght k. This means all the k-long st...

plus de 2 ans ago | 1 answer | 0

Question

Extract data from a non-rectangular text file, efficiently

In spite of going through Matlab help and several attempts, I still do not get how to use "textscan" or other relevant functions...

plus de 2 ans ago | 1 answer | 0

Question

How to reshape two cell arrays of strings into a cell array of cell arrays

Is there a neat way to vectorize the for-loop below? n_nodes = 2^(20-1); nodes = cellstr(dec2bin(0:n_nodes-1))'; ...

plus de 2 ans ago | 2 answers | 0

Question

Reading and processing data from text file to matlab variable quickly

I use the following code to read data from a text file and process it into two cell arrays, and it works, but can it be done fas...

plus de 2 ans ago | 1 answer | 0

Question

Vectorizing a structure assignment

Is vectorizing this for-loop possible and faster? nodes = cellstr(['GAA'; 'AACAG'; 'AAG'; 'AT'; 'ACA'; 'ACCGTTA';]); % samp...

plus de 2 ans ago | 1 answer | 0

Question

Vectorizing multiple string comparison

Is there a way to significantly speed up this loop, perhaps by vectorizing it? Inputs in attachment. I do not have a Matlab vers...

plus de 2 ans ago | 2 answers | 0

Question

Generating a vector containing the sizes of all cells of a cell array, along a specific dimension

Is there a way to vectorize this? (I tried with "cellfun", but did not succeed). for i = 1:numel(a) s(i) = size(a{i}...

plus de 2 ans ago | 2 answers | 0

Question

How to read a text file into a char array

This is probably trivial, but I have not found an easy way to convert a text file of n lines and m columns (sample attached) int...

presque 3 ans ago | 1 answer | 0

Question

Improving efficiency of a char array function

I have built a function to be run 100000 times in a loop. Its input, "motifs", is a full 20x15 char array, containing only four ...

presque 3 ans ago | 2 answers | 0

Question

How to efficiently generate a random integer within a range from an arbitrary probability distribution

I need to generate a random integer within a range from an arbitrary probability distribution, within a loop of 100000 iteration...

presque 3 ans ago | 2 answers | 0

Question

How to efficiently generate a new array by indexing an array with another array

Is there a faster way to implement this loop, maybe vectorizing it? for j = 1:m C(:,j) = B(A(:,j,k),j); end wh...

presque 3 ans ago | 1 answer | 0

Question

How to vectorize strfind

Is it possible to use strfind in a vectorized way? Suppose I want to get find not just one pattern inside a string, but several ...

presque 3 ans ago | 1 answer | 0

Question

Converting a text file into strings and integers

I have .txt input files with a very simple structure, of which I attach an example. I want to convert its content in strings and...

presque 3 ans ago | 1 answer | 0

Question

Replacing characters with integers in a very long string

I have a string of a few millions characters, want to replace it with a vector of integers according to simple rules, such as 'C...

presque 3 ans ago | 1 answer | 0

Question

Given a very long string, replace chars with numbers and obtain cumulative sum vector

As input I have a vector of a few million char, which can be 'A', 'C', 'G', 'T'. The vector is called sequence. As output I w...

presque 3 ans ago | 3 answers | 0

Question

How to vectorize a specific for-loop

I am trying to vectorize the for-loop hereafter. Would you have any hint? Thank you for i = 1 : numel(text)-k+1 % "text" i...

presque 3 ans ago | 2 answers | 1