how to feel an array with 3 numbers randomly

Question

joy 2014-8-14

编辑： Joakim Magnusson 2014-8-14

Hi,

I have an array say A, now it could contain 10,20,30 and 40 elements. Now I want to fill this array with 90,105,120 numbers randomly.

i.e my array would contain 10/20/30/40 elements but each time it have to be filled up with only 90,105,120 values randomly

Answer 1

Michael Haderlein 2014-8-14

Do I understand you correctly? In case of the 10 values array, you'd like to have e.g.

A=[90 120 105 105 120 90 90 90 120 105]

I'd go like this:

nums=[90 105 120];
A=nums(randi(3,1,10));

In case of 20 or more values, just change the third parameter in the randi function.

joy 2014-8-14

can u just tell me that what does the 2nd parameter 1 signifies in randi

Joakim Magnusson 2014-8-14

编辑：Joakim Magnusson 2014-8-14

If you write

A=nums(randi(3,2,10));

You get something like:

A=[90 120 105 105 120 90 90 90 120 105;105 120 90 105 120 90 105 90 120 105];

The 2nd parameter choose number of rows.