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Ulrik William Nash


Last seen: ungefär 4 år ago |  Active since 2015

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A question about Memoize
I am running a simulation that in some places consists of functions, which in turn have functions. The end of one of these "bran...

mer än 4 år ago | 0 answers | 0

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answers

Question


Lookup-scheme for potentially large n choose k matrices
I am writing a simulation that includes the variables and . These variable serves a part in numerous " choose " calculations. S...

mer än 4 år ago | 1 answer | 0

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answer

Question


Pasting large code without forced wrapping
I am trying to paste a very large portion of code, which has been via Mathematica. The problem is that MATLAB breaks the code at...

mer än 4 år ago | 1 answer | 0

1

answer

Question


Efficient code for obtaining the probability of X or less, when the PDF is known, but the CDF cannot be expressed precisely
I am working on a problem relating to a PDF that I can express precisely, and the related CDF, which I have given up expressing ...

mer än 4 år ago | 1 answer | 0

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answer

Question


Use a string as a struct name
In different files, I have a struct. Each struct has the same underlying structure and variable names. But the name of each stru...

mer än 4 år ago | 1 answer | 0

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answer

Question


The most efficient way to locate the first 1's in each row of a matrix
I have a potentially large r by c matrix, m, consisting of 1's and 0's. What is the most efficient way create a r by 1 vector, v...

mer än 4 år ago | 2 answers | 0

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answers

Answered
Find the ID of a specific text in a specific column of a many-columned cell.
dx = find(strcmp(Fundamentals, 'ZYXI'))

mer än 4 år ago | 0

| accepted

Question


Find the ID of a specific text in a specific column of a many-columned cell.
A simple question, for which a simple, to the point answer has been hard to find. Please see the attached image of my cell. I w...

mer än 4 år ago | 1 answer | 0

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answer

Question


Parallel Computing - how to run jobs from clients on servers with the same version.
After submitting a batch, I try to retrieve the computed data using j.fetchOutputs{:} However, the system throws the following...

nästan 5 år ago | 1 answer | 0

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answer

Question


Normalizing a sparse matrix so that rows sum to 1
I have the following sparse matrix, which relates to a markov process. The parts of the matrix have been assembled sequentially,...

ungefär 5 år ago | 1 answer | 0

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answer

Question


randsample([0 1],1,true,[1 - p p]) ..... with p as a vector?
I have the following code that generates a 0 or a 1 depending on the probability p: randsample([0 1],1,true,[1 - p p]) But sup...

mer än 5 år ago | 2 answers | 0

2

answers

Question


A bug in pearsrnd?
With the following values for mean, std, skewness, and kurtosis, pearsrnd stalls without warning: mean = -9.0000e-08 std = 0...

mer än 5 år ago | 1 answer | 0

1

answer

Question


Computing the average across columns, while discounting a specific column
What is the best way to compute the simple average across the columns of a matrix, when one of the columns must be completely di...

mer än 5 år ago | 2 answers | 0

2

answers

Question


Obtaining the significance of coefficients from polyfit
It is a simple matter to obtain the coefficients of a simple linear relationship using polyfit. For example coeff = polyfit(x,y,...

mer än 5 år ago | 1 answer | 0

1

answer

Question


Why does the set dimensions of my figure change upon saving?
I begin my charting with the following code: x0 = 10; y0 = 10; width = 556; height = 588; set(gcf,'un...

mer än 5 år ago | 0 answers | 0

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Question


Using MATLAB to collect and store data from INVESTOPEDIA
I am about to write a script that collects stock price data from INVESTOPEDIA. The data is available free of charge by entering ...

mer än 5 år ago | 1 answer | 0

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answer

Question


Drawing random numbers according to a particular scheme
I have a vector, p, and each entry in p is a number between 0 and 1. Moreover, the sum of all entries in p is exactly 1. Another...

nästan 6 år ago | 1 answer | 0

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answer

Question


An effiient way to isolate permutations of 0's and 1's that sum to k.
I am working on a problem where I need information about all permutations of n coinflips, where the sum of heads is k. I cou...

nästan 6 år ago | 2 answers | 0

2

answers

Answered
An effiient way to isolate permutations of 0's and 1's that sum to k.
Thank you, Walter Roberson. If I am not mistaken, the following provides the general answer: partitions(k,ones(1,n),1)

nästan 6 år ago | 0

Question


The fastest way to create a random network?
I am trying to create a square matrix of 1's and zeros, where 1's represents a communication link and 0's represents a lack of t...

mer än 6 år ago | 1 answer | 0

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answer

Question


Is this a bug in max(x)?
I have the following two vectors: a = [0.5 0.6 0.1 0.2 0.2]; b = [0.5 0.4 0.1 0.0 0.0]; and I now define x as their diffe...

mer än 6 år ago | 1 answer | 0

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answer

Question


How do I center a double-lined diagram title, interpreted as LaTex?
Why does the following not center the first line of the double-lined diagram title? str_title = {'Line 1';'Line 2'}; title(s...

mer än 6 år ago | 2 answers | 0

2

answers

Question


m1(m2 == 1), but with dimensions of m1 intact?
I have a matrix of 1's and 0'1, m2. I have another matrix with the same dimensions as m2, containing values (i.e., m1). Of these...

mer än 6 år ago | 1 answer | 0

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answer

Question


Removing rows from MyFolderInfo = dir('myfolder') before specific date
Having applied the code: MyFolderInfo = dir('myfolder') ; and having thus created the struct "MyFolderInfo" with 5 fields ...

mer än 6 år ago | 1 answer | 0

1

answer

Question


How important is the accurate specification of nnz for spalloc?
How important for performance is the accurate specification of nnz for spalloc? And is undershooting worse than overshooting?

nästan 7 år ago | 1 answer | 0

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answer

Question


Sequential or selective access to N Permute K
I found the function below on File Exchange developed by Loginatorist, which creates a matrix of permutations of elements with r...

nästan 7 år ago | 1 answer | 0

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Question


Out of memory - an alternative to this algorithm?
I am working on Markov Chain problem involving a large, sparse transition matrix. Unfortunately, in generating the transition ma...

nästan 7 år ago | 2 answers | 0

2

answers

Question


Summing values for duplicate rows and columns
I have a vector of rows, columns, and values that I will use to create a sparse matrix: rows = [1 2 3 1]; columns = [1 1 2 1...

nästan 7 år ago | 2 answers | 0

2

answers

Question


Updating a matrix based on conditions in other matrixes
I have coded the attached loop to update matrix Lr but I would ideally like to use code that can achieve what the shown loop is ...

nästan 7 år ago | 2 answers | 0

2

answers

Question


Creating a matrix based on information in a vector and another matrix
Suppose I have a vector of success probabilities, for example: p = [0.5,0.25,0.75] I also have a matrix of outcomes, o, w...

nästan 7 år ago | 1 answer | 0

1

answer

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