new in matlab, first question
3 vues (au cours des 30 derniers jours)
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hey, i'm trying to take a sample from a raw vector using myRandPerm. i had started in the folowing way:
function s=sample(x,n,seed)
if n>length(x)
-1
else
{don't know how exactly i can get myrandperm selecting n numbers from the x vector}
end
end
thank you...
2 commentaires
Dani Tormo
le 20 Mar 2013
Modifié(e) : Dani Tormo
le 20 Mar 2013
Try to format the code for an ease reading. You have more info on the Help button up here.
Réponses (2)
Sean de Wolski
le 20 Mar 2013
Welcome!
You can use randperm
doc randperm
or do what randperm() does under the hood:
[~,idx] = sort(rand(1,10))
2 commentaires
Sean de Wolski
le 20 Mar 2013
At the MATLAB command prompt run:
>> doc randperm
It will bring up the documentation. FYI: In this forum, gray text like that represents code to be executed.
Image Analyst
le 21 Mar 2013
From the help:
p = randperm(n,k) returns a row vector containing k unique integers selected randomly from 1 to n inclusive.
So
x = rand(1,20) % Generate sample data.
n = 5; % Take 5 from x at random locations
% Get the random locations.
xIndexes = randperm(numel(x), n);
% Extract x from those random locations.
xSubSample = x(xIndexes)
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