Need alternative to randsample for probability vectors with 0s in MATLAB -


i have question similar one: weighted random numbers in matlab

at point, use randsample in program follows:

t = [0 .5 .5; .5 0 .5; .5 .5 0] choices = 1:3  = 1:3     t(i) = transpose(randsample(choices,1,true,t(i,:))); end

thus t(i) describes each person neighbor select.

my t matrix, when read rowwise describes probability of person select neighbor. example, first row says 1st person select node 2 or 3 50% probability each. cannot select own node 1. scale model, have equal probability of selecting neighbor, 1/number of neighbors. have hardcoded t matrix here brevity's sake.

i tried use histc suggested in linked topic, since there 0 in each row of t matrix, don't think cumulative sum accurately sets bins rows 0 in middle (here second row of t).

i tried use bsxfun, , able sensical output when looking @ each row of t matrix individually, failed put in loop. feel solution may here, i'm not sure understand how function operating in context.

so, have ideas of how can speed randsample function? @ moment, iterate 10000x, , major bottleneck in program. works need to, it's far slow.

so want, each person, pick neighbour among other persons, uniform probability.

i way. should pretty fast.

n = 7;                      %// number of persons t = ceil((n-1)*rand(1,n));  %// step 1 t = t + (t>=(1:n));         %// step 2

for each k, generated t(k) randomly picked set {1, 2, ..., k-1, k+1, ..., n} uniform distribution. achieve this, 2 steps used:

  1. a random value picked {1, ..., n-1};
  2. if value greater or equal k incremented 1.

Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more