matlab problema~Please help me write this code

The statistic term, "mode", is the value that appears most often in a set of data. For example, the mode of this set of data, 2,8, 5, 3,7, 3,4, 5, 3, is 3. A set of data can also be bi-modal or multi-model is two or more values occur for the same number of times. For example, the data set, 2,5,1,4, 5, 2,3, has two modes, 2 and 5. Write a script that generates a lby20 vector containing random integers in the range [1-15], and then find the mode (or modes). Use the array traversing skills; do not use built-in functions such as sort () ,max () ,min () or mode ()