Ulrik William Nash
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Accept 5 answers given by other contributors
Awarded to Ulrik William Nash on 22 Jul 2017
Feeds
Frage
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...
etwa 5 Jahre vor | 0 Antworten | 0
0
AntwortenFrage
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...
etwa 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
etwa 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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 ...
etwa 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
etwa 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
etwa 5 Jahre vor | 2 Antworten | 0
2
AntwortenFind the ID of a specific text in a specific column of a many-columned cell.
dx = find(strcmp(Fundamentals, 'ZYXI'))
mehr als 5 Jahre vor | 0
| akzeptiert
Frage
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...
mehr als 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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,...
fast 6 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
etwa 6 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
A bug in pearsrnd?
With the following values for mean, std, skewness, and kurtosis, pearsrnd stalls without warning: mean = -9.0000e-08 std = 0...
etwa 6 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
etwa 6 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
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,...
mehr als 6 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 6 Jahre vor | 0 Antworten | 0
0
AntwortenFrage
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 ...
mehr als 6 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 6 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 6 Jahre vor | 2 Antworten | 0
2
AntwortenAn 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)
mehr als 6 Jahre vor | 0
Frage
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...
fast 7 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
fast 7 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 7 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
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...
mehr als 7 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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 ...
mehr als 7 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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?
mehr als 7 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 7 Jahre vor | 1 Antwort | 0
1
AntwortFrage
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...
mehr als 7 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
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...
mehr als 7 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
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 ...
mehr als 7 Jahre vor | 2 Antworten | 0
2
AntwortenFrage
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...
mehr als 7 Jahre vor | 1 Antwort | 0
1
Antwort
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