3. Read about the sortrows function in MATLAB\'s help documentation and then wri

Question

3. Read about the sortrows function in MATLAB's help documentation and then write a script that creates a 10x5 matrix of random values between 0 and 10 and then sorts it using sortrows. 4. Write a single line of MATLAB code that computes the mean and standard deviation of a 1-dimensional array named A of numbers. You may not use loops, or the mean, variance, or stdev functions. Assume the array A has already been defined. The mean is the arithmetic average of the values in the array, mu = 1/n summation i = 1 to n ai. The variance is the arithmetic average of the squared difference between each value and the mean, sigma^2 = 1/n - 1 summation i = 1 to n (ai - mu)^2. The standard deviation is the square root of the variance, sigma = rootsigma^2..

Explanation / Answer

array = zeros(10,5)
for i = 1 : 10
     % generate random integers beween 0 to 10 (inclusive)
    array(i, : ) = randperm(11,5)-1;
end

disp("Array before sorting")
disp(array)
sortarray = sortrows(array)
disp("Array after row sorting")
disp(sortarray)


--------output----------------
Executing the program....
$octave -qf --no-window-system main.m

array =

   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0
   0   0   0   0   0

Array before sorting
    6    2    5    3    0
    7    6    2    5    3
    6    1    3    8    7
    9    1    6    8    7
    8   10    0    5    7
   10    9    8    0    2
    4    8    3    9    1
    4    5    6    9    0
    1    2    9   10    7
    3    7    0   10    9
sortarray =

    1    2    9   10    7
    3    7    0   10    9
    4    5    6    9    0
    4    8    3    9    1
    6    1    3    8    7
    6    2    5    3    0
    7    6    2    5    3
    8   10    0    5    7
    9    1    6    8    7
   10    9    8    0    2

Array after row sorting
    1    2    9   10    7
    3    7    0   10    9
    4    5    6    9    0
    4    8    3    9    1
    6    1    3    8    7
    6    2    5    3    0
    7    6    2    5    3
    8   10    0    5    7
    9    1    6    8    7
   10    9    8    0    2

---------------------Question 4-------------------------------------------------
% randome integers in [1 to 20]
data = randperm(20,5);
disp(data)
%mean
meanOfData = sum(data) / length(data)

%s.d
sd = power(sum((data .- meanOfData).^2), 1/2)


disp(sd)
    9   11   13   20   19
meanOfData = 14.400
sd = 9.7570
9.7570

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.