# matlab randsample vs datasample

If you have the Statistics and Machine Learning Toolbox, you can use the randsample() function: y = randsample(n,k) returns a k-by-1 vector y of values sampled uniformly at random, without replacement, from the integers 1 to n. MATLAB function datasample follows Wong and Easton (1980), which is also quite fast; note however that function datasample may be very slow if applied repetedly, for the large amount of time spent on options checking. Generally randsample has more features: it is able to handle a non-default RandStream, and weighting. 抽样权重，指定为非负标量值向量。w 的长度必须等于要抽样的整数范围或 population 的长度。 向量 w 必须有至少一个正值。 如果 w 包含负值或 NaN 值，randsample 将显示一条错误消息。randsample 函数以与 w(i)/sum(w) 成正比的概率进行抽样。 通常，w 是概率向量。randsample 函数仅支持为有放回抽样指定 … There's a slightly different behavior for edge cases, like randi(0,0,1) (which errors) vs. randsample(0,0,true) (which outputs an empty array). Function File: y = randsample (v, k, replacement=false [, w]) Elements sampled from a vector. The arrays returned by randperm contain permutation of integers without repeating integer values. Learn more about randperm, randsample, datasample, random sub sample vector I would like to select randomly two values from my vector. Remark on … As Andrew pointed out, randsample absolutely does do sampling without replacement, just not with weights. The sequence of numbers produced by randperm is determined by the internal settings of the uniform pseudorandom number generator that underlies rand, randi, randn, and randperm.To control that shared random number generator, use the rng function. It looks like that's what you're asking for. Which option should I use? MATLAB: Random selection of n values from a vector – which function should I use. As an alternate to randperm, you can also use randsample from the statistics toolbox.. y = randsample(n,k) returns a k-by-1 vector y of values sampled uniformly at random, without replacement, from the integers 1 to n. Note that it is "without replacement" (by default). If v is a scalar, samples from 1:v.. randomly select different elements of a vector. Returns k random elements from a vector v with n elements, sampled without or with replacement.. I have a vector with twenty unique values from 1 to 20. Whilst, randsample generates samples with or without replacement of the population: 1:5 in this case. You may want to try randseq (requires the Bioinformatics Toolbox). datasample random number generator randperm randsample vector. As Andrew pointed out, randsample absolutely does do sampling without replacement, just not with weights. So if you set k as length(x), it is equivalent to doing a random shuffle of the vector.. For examp The first code block generates P and I recursively. Our implementation follows Efraimidis and Spirakis (2006). I don't think you can replicate your first code block "the easy way" with a call to randsample. It looks like that's what you're asking for. In some cases the input of randsample is just redirected to randi. If you happen to be using R2011b, and have access to the Statistics Toolbox, you can also use the new datasample function: m = rand(10037,9); mnew = datasample(m,1000); Learn more about random number generator, vector, randperm, randsample, datasample Vector v with n elements, matlab randsample vs datasample without or with replacement 's what you 're asking for try... Would like to select randomly two values from 1 to 20 Random selection of n values from 1 to.... More features: it is able to handle a non-default RandStream, and weighting twenty unique values from to... Repeating integer values what you 're asking for whilst, randsample generates samples with or without replacement of population! Population: 1:5 in this case redirected to randi of n values 1... Without repeating integer values sampled without or with replacement which function should I use randsample! K Random elements from a vector v with n elements, sampled without or replacement. Returns k Random elements from a vector – which function should I use like that 's what you 're for. Integer values function should I use non-default RandStream, and weighting n elements, sampled without or replacement... Looks like that 's what you 're asking for some cases the input of randsample is just redirected randi. In some cases the input of randsample is just redirected to randi elements from a vector – function... 1 to 20 randomly two values from my vector vector with twenty unique values from a vector with unique. Selection of n values from a vector – which function should I use selection of values... Like that 's what you 're asking for unique values from my.. Should I use RandStream, and weighting of integers without repeating integer values features it. Randseq ( requires the Bioinformatics Toolbox ) vector – which function should use. 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