Answered
Fast calculation of short cumulative product vector
Nobody has followed Knut's suggestion: y(n) = y(n-1)*y(1) It is in fact a special case of Horner's Method for evaluating a...
Fast calculation of short cumulative product vector
Nobody has followed Knut's suggestion: y(n) = y(n-1)*y(1) It is in fact a special case of Horner's Method for evaluating a...
mer än 12 år ago | 0
Answered
alternative to log?
No matter what transformation you use, the result, prod(pi, i=1:n) --> 0, so eventually you will get underflow in fixed precisio...
alternative to log?
No matter what transformation you use, the result, prod(pi, i=1:n) --> 0, so eventually you will get underflow in fixed precisio...
mer än 12 år ago | 0
Answered
Loop unrolling question
Most of those manuals or books are out of date, or are unaware of the JIT compiler, or do not understand what the JIT compiler d...
Loop unrolling question
Most of those manuals or books are out of date, or are unaware of the JIT compiler, or do not understand what the JIT compiler d...
mer än 12 år ago | 0
Answered
Loop unrolling question
David, What you call _loop unrolling_ is not. Here is a rolled-up loop: for i = 1:n a(i) = b(i)*c(i) end ...
Loop unrolling question
David, What you call _loop unrolling_ is not. Here is a rolled-up loop: for i = 1:n a(i) = b(i)*c(i) end ...
mer än 12 år ago | 0
Answered
Why does 1 - 2/3 - 1/3 not equal zero?
Ned, Let me add to the confusion by asking 1. Why does |en1 = (1 - 2/3) - 1/3 = 5.5511e-017 = 2^(-54) = eps/2^2|? 2. Why does...
Why does 1 - 2/3 - 1/3 not equal zero?
Ned, Let me add to the confusion by asking 1. Why does |en1 = (1 - 2/3) - 1/3 = 5.5511e-017 = 2^(-54) = eps/2^2|? 2. Why does...
mer än 12 år ago | 1
Question
What does RANDPERM miss?
Abstractly, a random permutation generator (RPG) is a function that maps a random bit-string of length |b| into a permutation of...
nästan 13 år ago | 4 answers | 1
4
answersAnswered
How to average only positive values in an array?
At the risk of offending the "vectorizers", the function below is 2 to 3 times faster than Jan's answer: function MeanP...
How to average only positive values in an array?
At the risk of offending the "vectorizers", the function below is 2 to 3 times faster than Jan's answer: function MeanP...
nästan 13 år ago | 0
Answered
MATLAB's accuracy of digits number
Here is a quotation from Prof Nick Trefethen FRS, Oxford: 11. _No physical constants are known to more than around eleven digit...
MATLAB's accuracy of digits number
Here is a quotation from Prof Nick Trefethen FRS, Oxford: 11. _No physical constants are known to more than around eleven digit...
nästan 13 år ago | 0
Answered
How do I write a good answer for MATLAB Answers?
An answer should _illuminate_ not _dazzle_.
How do I write a good answer for MATLAB Answers?
An answer should _illuminate_ not _dazzle_.
nästan 13 år ago | 2
Answered
random elements from specific rows in matrix
function rrelems = RandRowElems(A) % USE: m = 10; n = 10^6; % A = ceil(100*rand(m,n)); % tic;relems =...
random elements from specific rows in matrix
function rrelems = RandRowElems(A) % USE: m = 10; n = 10^6; % A = ceil(100*rand(m,n)); % tic;relems =...
ungefär 13 år ago | 0
Question
What is the "best" way to Generate a Bernoulli Process?
A *Bernoulli Process* is a sequence of iid (independent, identically-distributed) random variables |x1,x2,...,xi,...|, where t...
ungefär 13 år ago | 4 answers | 1
4
answersAnswered
Profiler Paradox
In certain cases the profiler is worse than useless -- it is misleading. As you will have noticed, the profiler adds a lot of ov...
Profiler Paradox
In certain cases the profiler is worse than useless -- it is misleading. As you will have noticed, the profiler adds a lot of ov...
ungefär 13 år ago | 0
Answered
Does MATLAB have a Birthday Problem?
Reply from Derek O'Connor: I must apologize for the omission of the RNG used. It was in my original draft but somehow got left ...
Does MATLAB have a Birthday Problem?
Reply from Derek O'Connor: I must apologize for the omission of the RNG used. It was in my original draft but somehow got left ...
ungefär 13 år ago | 1
| accepted
Question
Does MATLAB have a Birthday Problem?
The Birthday Paradox or problem asks for the probability that in a room of n people, 2 or more have the same birthday (not date)...
ungefär 13 år ago | 5 answers | 3
5
answersAnswered
Can MATLAB draw graphs or networks with a regular structure?
Berk, Graph layout is a very difficult problem and has been studied for many years. AT&T has a department or section dedica...
Can MATLAB draw graphs or networks with a regular structure?
Berk, Graph layout is a very difficult problem and has been studied for many years. AT&T has a department or section dedica...
ungefär 13 år ago | 1
Submitted
RPG Lab
A set of functions for generating and testing random permutations of the integers (1,2, ..., n).
ungefär 13 år ago | 1 download |
