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How to select random numbers from a given list in matlab / octave


How to select random numbers from a given list in matlab / octave

By : user2948354
Date : November 14 2020, 04:51 PM
Any of those help Just create a random index for dataset. Below I select 6 random entries from your dataset:
code :
dataset = [10;20;25;111;14];
idx = randi (numel (dataset), 6, 1)
dataset (idx)
idx =

   4
   4
   2
   5
   3
   5

dataset (idx)
ans =

   111
   111
    20
    14
    25
    14


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How to generate random numbers, strings and select a random choice from a drop down list in Watin?

How to generate random numbers, strings and select a random choice from a drop down list in Watin?


By : web surfer
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I do have some opinions on testing with non deterministic data, but I'll keep them to myself as I don't know the background :)
I don't know of any built-in functionality for that, but you can easily add your own methods to do it;
code :
    static string RandomString(int len)
    {
        var random = new Random();
        return new string(Enumerable.Range(1, len)
            .Select(_ => (char)(random.Next() % 95 + 33)).ToArray());
    }

    static string RandomDigits(int len)
    {
        var random = new Random();
        return new string(Enumerable.Range(1, len)
            .Select(_ => (char) (random.Next()%10 + '0')).ToArray());
    }
ieInUse.TextField(Find.ById("Blah")).TypeText(RandomString(7)); 
ieInUse.GoTo("http://randomwebsite/Description/" + RandomDigits(2));
Getting numbers based on list of other numbers in matlab / octave

Getting numbers based on list of other numbers in matlab / octave


By : Hyungkeun Choi
Date : March 29 2020, 07:55 AM
Hope this helps When I type in (1:4:16) in matlab / octave I get 1,5,9,13 as the answer , you can use this function:
code :
function num = getTheMissingNumbers( from, jump, to )

num = from:to;
num = setdiff( num, from:jump:to );
>> getTheMissingNumbers( 1, 4, 16 )
function num = getTheMissingNumbers( jump, to )

num = 1:to;
num(1:jump:to) = []; % remove the elements in ind
Populating Multi dimensional array in octave/matlab to create waterfall plot in octave / matlab

Populating Multi dimensional array in octave/matlab to create waterfall plot in octave / matlab


By : Metin Aytekin
Date : March 29 2020, 07:55 AM
hop of those help? Your error is here: ma(:,:,k)=[ma;ma_tmp];
You are mixing up two concepts.
code :
ma = [ma; ma_tmp];
 ma(:,:,k) = ma_tmp;
python, select random #k numbers from (1, n) excluding numbers in list

python, select random #k numbers from (1, n) excluding numbers in list


By : Shini
Date : March 29 2020, 07:55 AM
will be helpful for those in need Sample notes in sample's docstring:
code :
In [11]: sample(range(100000000), 3)
Out[11]: [70147105, 27647494, 41615897]

In [12]: list(range(100000000))  # crash/takes a long time
import bisect
import random

def sample_excluding(n, k, excluding):
    # if we assume excluding is unique and sorted we can avoid the set usage...
    skips = [j - i for i, j in enumerate(sorted(set(excluding)))]
    s = random.sample(range(n - len(skips)), k)
    return [i + bisect.bisect_right(skips, i) for i in s]
In [21]: sample_excluding(10, 3, [2, 4, 7])
Out[21]: [6, 3, 9]

In [22]: sample_excluding(10, 3, [1, 2, 8])
Out[22]: [0, 4, 3]

In [23]: sample_excluding(10, 6, [1, 2, 8])
Out[23]: [0, 7, 9, 6, 3, 5]
In [24]: sample_excluding(10000000, 6, [1, 2, 8])
Out[24]: [1495143, 270716, 9490477, 2570599, 8450517, 8283229]
How can I select a random numbers from an array in matlab in a repeating way?

How can I select a random numbers from an array in matlab in a repeating way?


By : user3359342
Date : March 29 2020, 07:55 AM
wish of those help I have an array name time with 1 row and 1000 columns.
code :
len = length(time); % length of the vector
time7 = zeros(1,len) ;  % initilaize the vector time7 to store your time7
common_time = 5;
for iValue = 1:len
  % randi used to get a random value   
  time2 = time(randi([1, len], 1));
  time3 = time(randi([1, len], 1));
  time4 = (time2 + time3)/2;
  time5 = time(randi([1, len], 1));
  time6 = common_time - time5;
  time7(iValue) = time4 - time6;
end
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