Increassing an array by a random value

Hello guys,

lets say I have 3 arrays and 3 random numbers that I use to increase elements in the 3 arrays. Something like this:

a = rand()*(2)-1;
b = rand()*(2)-1;
c = rand()*(2)-1;
X = [1...10];
Y = [11...20];
Z = [21...30];

Now the easiest way to increase the elements in arrays by those number would be:

X1 = X+a
Y1 = Y+b
Z1 = Z+c

My question is if there is a way to add those random numbers randomly, so it will alway choose a random number from a,b,c to every array

Answer 1

[Walter Roberson]

a = rand()*(2)-1;
b = rand()*(2)-1;
c = rand()*(2)-1;
abc = [a,b,c]

abc = 1×3

-0.2610 0.8958 0.0643

X = [1:10];
Y = [11:20];
Z = [21:30];
XYZ = [X;Y;Z];

ridx = randi(3, size(XYZ))

ridx = 3×10

3 3 3 3 2 1 2 3 1 1 1 3 2 3 1 3 1 3 2 2 3 3 2 3 2 1 1 2 1 3

XYZ = XYZ + abc(ridx);

X1 = XYZ(1,:)

X1 = 1×10

1.0643 2.0643 3.0643 4.0643 5.8958 5.7390 7.8958 8.0643 8.7390 9.7390

Y1 = XYZ(2,:)

Y1 = 1×10

10.7390 12.0643 13.8958 14.0643 14.7390 16.0643 16.7390 18.0643 19.8958 20.8958

Z1 = XYZ(3,:)

Z1 = 1×10

21.0643 22.0643 23.8958 24.0643 25.8958 25.7390 26.7390 28.8958 28.7390 30.0643