Need help with steps and code to complete this.

1. Write a short program in matlab that does the following:

(i) Creates a vector that is 100 elements long, containing the numbers 1-20 repeated five times each, occurring in random order within the vector.

(ii) Have the program do this five times, creating five separate vectors, and save them all to a .mat file called "outputVectors.mat" (or similar).

x=(1:100)

I am not sure how to make it repeat in 20s

I tried:

x=(1:20*5) 

but it did not work

[Steven Lord]

Since this sounds like homework, if you show us what you've tried so far and ask a specific question about where you're having difficulty we may be able to offer suggestions for how to improve and/or correct your code.

[Debra Henke]

x=(1:100)

I am not sure how to make it repeat in 20s

I tried: x=(1:20*5)

but it did not work

[Jan]

Whenever you post in the forum, that something does not work, be sure to attach eitehr the complete error message or explain the difference between your expectation and the result. Of course 1:20*5 does work. But you want something else.

Answer 1

[Jan]

Please read the "Getting Started" chapters of the documentation and search in the net for "Matlab onramp" to get a short instruction. The forum is not te best location to learn the basics.

Example:

a = [1,2,3]
b = [a, a]

See also the command

doc repmat

and

doc repelem

Finally you want a random order. Start with reading

doc rand

At the bottom you find a "See also" line, which contains similar commands. One of them helps you to shuffle the elements: You want a random permutation.