How to write program to choose random numbers from given input set?

Question

reshdev 2014-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/152795-how-to-write-program-to-choose-random-numbers-from-given-input-set

回答： Image Analyst 2014-8-29

采纳的回答： Star Strider

i want to write two programs ----

a program that can randomly choose number T1 from [5, 10, 15] and if

if it choose T1=5, then it should give T2= 6

if it choose T1=10, then it should give T2= 11

if it choose T1=15, then it should give T2= 16

So, T2 is addition of 1 to T1

second program-----

if i have set of values P=(1,2,3,......10)

how to pick randomly P1 and P2 from above set such that P1 and P2 are not same.

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Answer 1

Star Strider 2014-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/152795-how-to-write-program-to-choose-random-numbers-from-given-input-set#answer_150214

编辑：Star Strider 2014-8-29

在 MATLAB Online 中打开

Seems like homework.

My code:

X = 5:5:15;
T1 = X(randi(3));
T2 = T1+1;
P1 = X(randi(3));
P2 = setdiff(X,P1);
P2 = P2(randi(2));

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reshdev 2014-8-29

Thank You. just to let you know, second program has nothing to do with first one. Sorry, i know it could be simple program but i am new to matlab.

Star Strider 2014-8-29

My pleasure!

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Answer 2

Image Analyst 2014-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/152795-how-to-write-program-to-choose-random-numbers-from-given-input-set#answer_150217

在 MATLAB Online 中打开

Try this:

% Program 1
clc;
% Define the choices:
choices = [5, 10, 15];
% Get T1 at random.
T1 = choices(randi(3,1,1))
% Get T2, which is one plus T1
T2 = T1 + 1;
% Program 2
P = 1:10
% Get two random locations that are different.
randomIndexes = randperm(length(P), 2)
% Extract the two values.
P1 = P(randomIndexes(1))
P2 = P(randomIndexes(2))