Can I use randi and say random number from 1 to 30 except 8 and 9? (for example)

Question

Akana Juliet 2021-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/859915-can-i-use-randi-and-say-random-number-from-1-to-30-except-8-and-9-for-example

评论： Akana Juliet 2021-6-21

Hi everyone. I have some bad data that I have to exclude from my random index selecter but I can't remove it from my data.

For example, I wanted to say Random integer from 1 to 30, but exclude 8 and 9

This works but when I try to add another integer, like 8 and 9 for example, it doesn't work.

randRow = randi(30,1);
 while randRow == 8
   randRow = randi(30,1);
end

Do you guys know the right syntax? or is there an easier way to do it?

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Answer 1

Stephen23 2021-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/859915-can-i-use-randi-and-say-random-number-from-1-to-30-except-8-and-9-for-example#answer_727985

编辑：Stephen23 2021-6-18

在 MATLAB Online 中打开

This is MATLAB, so your first thought should always be to use arrays and indexing:

vec = setdiff(1:30,8:9) % or [1:7,10:30] or whatever
vec = 1×28
     1     2     3     4     5     6     7    10    11    12    13    14    15    16    17    18    19    20    21    22    23    24    25    26    27    28    29    30
val = vec(randi(numel(vec)))
val = 22

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Stephen23 2021-6-21

在 MATLAB Online 中打开

vec = setdiff(1:30,[8,9,11,15,18])
vec = 1×25
     1     2     3     4     5     6     7    10    12    13    14    16    17    19    20    21    22    23    24    25    26    27    28    29    30

How to generate and concatenate vectors is explained here

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

Akana Juliet 2021-6-21