how can arbitrary row groups can be selected.

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Prabha Kumaresan 2018-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/375309-how-can-arbitrary-row-groups-can-be-selected

编辑： Cedric 2018-1-3

If A=50; B=100; C=rand(50,100); How can the arbitrary row groups can be selected.

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John BG 2018-1-3

Hi Prabha

this is John BG <mailto:jgb2012@sky.com jgb2012@sky.com>

the 'how arbitrary' is equivalent to 'how flat' is the probability distribution you apply to pick samples.

The closer to a uniform 'flat' probability density function the 'more arbitrary' that your samples are.

Also, the longer the samples the lower the probability to repeat them, thence 'more arbitrary' so the amount of rows you decide to take in each sample, as well as the amount of samples also contribute to the randomness of your selection.

Would it be possible for you to add more information like

1.- how many rows do you plan to put in each sample?

2.- is the length of the samples constant, or you plant to take varying amounts of rows each time?

3.- how many samples do you intend to take?

Prabha Kumaresan 2018-1-3

编辑：Cedric 2018-1-3

在 MATLAB Online 中打开

If A =
       [1     2     3     4     5;
      11    12    13    14    15;
       6     7     8     9    10;
      21    22    23    24    25;
      16    17    18    19    20]
and B =
      [ 0     0    41     0     0;
      45     0     0     0     0;
       0    43     0     0     0;
       0     0     0    42     0;
       0     0     0     0    44]
Which results in 
C =
       [0     0    41     4     0;
      45    12     0     0    15;
       6    43     0     0    10;
       0     0    23    42     0;
      26    27     0     0    44]

Which indicates to be the goal is adding values to B from A. The rule for this is that in groups of rows the entire column must be either 0 or contain a value. If B on that position is equal to 0, the value is taken from A.

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