Dice Simulation in MatLab

I have to write a script that uses the user input to roll a certain amount of dice, with a certain amount of sides, with a certain amount of rolls , and a certain amount of trials.

I have the whole user input part down, but I'm having trouble writing a function for rolling the dice.

function [ X ] = Dice( N, S, T, R )
% Dice simulates a random selection of numbers which is similar to how a dice is rolled
% N is the number of dice the user wants to roll
% S is the number of sides on the dice
% T is the number of trials that the user wants to run.
% R is the number of rolls that the user wants to roll each dice.

D =ceil(S*rand(1,N))

% I used this for one roll of the dice

Counts = hist(D,[1:S]);

% Then I used this to count how many of each number showed up

How do I write the code so that I can factor in the amount of trials and rolls? I know I probably have to do something with for loops, but I'm very confused and I can't think of anything at the moment.
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