Docs @ Psychtoolbox Wiki : PsychProbability

Search PTB Function help:
homepsychtoolbox.orgpage updateslogin

PsychProbability

Psychtoolbox

Psychtoolbox:PsychProbability.

Computation/Evaluation of probability distributions, basic sampling and
randomization.


BalanceFactors - Balance a set of factors given the factor levels.
BalanceTrials - Balance a set of factors given the factor levels. Takes alternative parameters wrt. BalanceFactors.
BuildMarkovK - Build covariance matrix for Markov process.
ChiSqrCumulative - Chi-squared distribution probability function.
ChiSquarePDF - Chi-squared distribution PDF.
ChooseKFromN - Randomly choose k distinct integers out of n.
ClockRandSeed - Seed rand() and randn() from clock.
CoinFlip - Bernoulli random variable.
CoinFlipPDF - Bernoulli distribution PDF.
ColMean - Take column means, works for one row matrices.
ColStd - Take column stds, works for one row matrices.
CombVec - Generate all possible combinations of input vectors.
CovToCorr - Compute matrix of correlations from covariance.
FindNeighborCorr - Find nearest neighbor correlations in data set.
MultiNormalDraw - Draw vectors from multivariate normal.
MultiNormalPDF - Compute multivariate normal PDF.
NormalCumulative - Univariate normal CDF
NormalDraw - Draw from univariate normal.
NormalPDF - Univariate normal PDF.
NormalProb - Compute probability of univariate normal in interval.
NRandPerm - Randomly select elements from a random permutation.
RandDim - Randomize matrix along any dimension.
Randi - Get random integer sample. Same as Ranint, but Denis prefers it.
RandLim - Generates a matrix of random numbers between a lower and upper limit.
RandSample - Get a random sample from a list.
RandSel - Randomly select elements from matrix, elements are replenished.
Ranint - Get random integer sample. Same as Randi, but David prefers it.
Sample - Get a random sample from a list.
Shuffle - Randomly reorder the entries of vector/matrix.
UniqueAndN - Returns unique elements of array and the number of times each element occurs in the array.
UniqueNoSorting - Returns elements of array in order of appearance or disappearance.
URandSel - Randomly select elements from matrix, elements are not replenished.


Combining CombVec and RandDim
Using CombVec and RandDim, it is very simple to generate all trials
in an experiment with a factorial design and then randomize these
trials:
cond_a = [1 2]; cond_b = [120 180]; ntrial = 2;
trial = CombVec(cond_a,cond_b);
trial =
1 2 1 2
120 120 180 180

trial = repmat(trial,1,ntrial); % each combination of conditions occurs ntrial times
trial(end+1,:) = [1:size(trial,2)]; % append trial number
trial = RandDim(trial,2); % shuffle trial order

trial =
2 1 1 2 1 1 2 2
120 180 180 180 120 120 120 180
6 3 7 8 5 1 2 4


BalanceFactors.m was contributed by David E. Fencsik (fencsik@gmail.com), thanks!




Path   Retrieve current version from GitHub | View changelog
Psychtoolbox/Contents.m


The following 35 page(s) belong to PsychProbability

BalanceFactors
BalanceTrials
BuildMarkovK
ChiSqrCumulative
ChiSquarePDF
ChooseKFromN
ClockRandSeed
CoinFlip
CoinFlipPDF
ColMean
ColStd
CovToCorr
FindNeighborCorr
MultiNormalDraw
MultiNormalPDF
NormalCumulative
NormalDraw
NormalPDF
NormalProb
PsychRandSample
Psychtoolbox
RandSample
Randi
Ranint
Sample
Shuffle
UnitTests
combvec
nrandperm
randdim
randlim
randsel
uniqueandn
uniquenosorting
urandsel
Valid XHTML 1.0 Transitional :: Valid CSS :: Powered by WikkaWiki
Page was generated in 0.0857 seconds