Matlab is an effective tool for various fields, such as computing, engineering, and mathematics. This article provides beginners with insight into Matlab challenges and solutions so they may utilize the program more effectively. Explore what our Matlab course syllabus has in store.
Matlab Problems and Solutions for Beginners
The following are some MATLAB problems that beginners could run into and their fixes:
Challenges with Memory Leaks in Matlab
Challenge: Memory leaks may arise from improper implementation of data structures, code optimization, and memory management. As a result, system resource use may rise without program performance increasing in tandem.
Solutions: Users can stop memory leaks by:
- Recognize how MATLAB uses memory.
- Technologies such as memory profiling and debugging should be used to guarantee effective resource management.
- Develop sound coding practices by designing data structures correctly and optimizing your code.
Challenges with Errors and Warnings in Matlab
Users can utilize MATLAB to look for errors and warnings by:
- Right-click on the code that is highlighted.
- From the context menu, pick the recommended solution.
- If a problem occurs more than once, MATLAB can apply the recommended solution to each occasion.
Learn the basics through the Matlab tutorial for beginners.
Matlab Exercises and Solutions
Here you can find various Matlab code challenges and solutions useful for beginners and professionals. Get a free Matlab exercises and solutions PDF from our trainers and train your brain for a bright career.
Create a Checkerboard Matrix in Matlab
Challenge: The rectangular checkerboard picture produced by I = checkerboard(n, p, q) has p as the number of tile rows and q as the number of tile columns. The checkerboard is square and the number of columns defaults to p if q is left out.
Code Solution:
function a = checkerboard(n)
a = ones(n);
for j = 1:2:n
for i = 2:2:n
a(i,j) = 0;
end
end
for j = 2:2:n
for i = 1:2:n
a(i,j) = 0;
end
end
end
Determine Whether a Vector is Monotonically Increasing
Challenge: If the input vector’s items grow monotonically, that is, if each element gets bigger than the one before it, then return true. Otherwise, return false.
Example:
Input x = [-3 0 7]
Output tf is true
Input x = [2 2]
Output tf is false
Code Solution:
function tf = mono_increase(x)
if length(x) > 1
for i = 2:length(x)
if x(i) <= x(i-1)
tf = false;
break
else
tf = true;
end
end
else
tf = true;
end
end
Generate Fibonacci Sequence in Matlab
Challenge: Determine the Fibonacci number n.
Where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2,…, return f given n.
Example:
Input n = 5
Output f is 5
Input n = 7
Output f is 13
Code Solution:
function f = fib(n)
sequence = zeros(1,n);
sequence(1,1) = 1;
sequence(1,2) = 1;
if n == 1
f = 1;
elseif n == 2
f = 1;
else
for i = 3:n
sequence(1,i) = sequence(1,i-1) + sequence(1,i-2);
end
f = sequence(1,n);
end
end
Create TimeTables in Matlab
All of us have had to commit tedious times tables to memory at some point. Five times five equals twenty-five. 30 equals 5 times 6. Twelve times twelve is much more than you might imagine.
Challenge: Making times tables should be simple with MATLAB! Create a function that generates times tables of the specified size.
Example:
Code Solution:
function m = timestables(n)
m = zeros(n);
counter = 1;
for i = 1:n
m(1,i) = counter;
m(i,1) = counter;
counter = counter + 1;
end
for i = 2:n
for j = 2:n
m(i,j) = m(i,1)*m(1,j);
end
end
end
Solve equations in Matlab with our Matlab project ideas.
Finding the Mean of Prime Numbers in Matlab
Challenge: The matrix will always contain at least one prime. Find the mean of prime numbers.
Example:
Input in = [ 8 3
5 9 ]
Output out is 4 or (3+5)/2
Code Solution:
function out = meanOfPrimes(in)
primeTF = isprime(in);
primeTFIndex = find(primeTF);
x = [];
for i = 1:length(primeTFIndex)
x = [x, in(primeTFIndex(i))];
end
out = mean(x);
end
Pascal’s Triangle in Matlab
Challenge: Create the length n+1 row vector that represents the n-th row of Pascal’s Triangle given an integer n >= 0.
Example:
pascalTri(0)
ans =
1
pascalTri(1)
ans =
1 1
pascalTri(2)
ans =
1 2 1
Code Solution:
function y = pascalTri(n)
if n == 0
y = [1];
elseif n == 1
y = [1 1];
elseif n == 2
y = [1 2 1];
else
numele = n + 1;
previous = pascalTri(n-1);
y = zeros(1,numele);
y(1) = 1;
y(end) = 1;
for i = 2:numele-1
y(i) = previous(i)+previous(i-1);
end
end
end
Find the Longest Sequence of 1’s in a Binary Sequence in Matlab
Challenge: Given a string like
s = ‘011110010000000100010111’
determines the length of the longest sequence of consecutive ones. The response in this case would be 4.
Example:
Input x = ‘110100111’
Output y is 3
Code Solution:
function maxCount = lengthOnes(x)
%% convertsion into numerical array
a = 1234;
b = num2str(x)-‘0’;
%% initializing
count = 0;
maxCount = 0;
if b(1) == 1
count = 1;
maxCount = 1;
end
%% main
for i = 2:length(b)
if b(i) == 1
if b(i) == b(i-1)
seq_repeat = true;
else
seq_repeat = false;
end
if seq_repeat == true
count = count + 1;
else
count = 1;
end
if count > maxCount
maxCount = count;
end
else
count = 0;
end
end
end
Target Setting in Matlab
Challenge: Sort the provided list of numbers by the distance between each entry and the desired value t. The outcome ought to yield a list of the absolute values of the difference between a(n) and t, arranged in descending order.
Thus, the output b should be [1 2 4 17 8] if a = [1 2 4 8 17] and t = 12.
Code Solution:
function a_sorted = targetSort(a,t)
dist_vector = [];
for i = 1:length(a)
dist_vector = [dist_vector, norm(a(i)-t)];
end
dist_pair = zeros(length(a),2);
dist_pair(:,1) = dist_vector’;
dist_pair(:,2) = a’;
dist_pair_sorted = sortrows(dist_pair,’descend’);
a_sorted = dist_pair_sorted(:,2)’;
end
Finding the Alphabetic Word Product in Matlab
Challenge: The output word product p is a number based on the correspondence a=1, b=2,… z=26 if the input string s is a word like “hello.” Despite the possibility of a mixed case, assume the input will consist of a single word. Keep in mind that B=b=2 and A=a=1.
Thus, s = ‘hello’ means
p = 8 * 5 * 12 * 12 * 15 = 86400
Code Solution:
function product = word_product(string)
small_alphabet = char(97:122);
large_alphabet = char(65:90);
product = 1;
alphabet_value = strings(length(small_alphabet),2);
for i = 1:length(small_alphabet)
alphabet_value{i,1} = small_alphabet(i);
alphabet_value{i,2} = large_alphabet(i);
end
for k = 1:length(string)
[order,~] = find(strcmp(alphabet_value, string(k)));
product = product*order;
end
end
Fine-tune your skills with our Matlab interview questions and answers.
Pangrams in Matlab
Challenge: A sentence that uses every letter of the alphabet at least once is called a pangram, or holoalphabetic sentence.
Example:
Input s = ‘The quick brown fox jumps over the lazy dogs’
Output tf = true
Code Solution:
function tf = isPangram(s)
letters_small = ‘abcdefghijklmnopqrstuvwxyz’;
letters_capital = ‘ABCDEFGHIJKLMNOPQRSTUVWXYZ’;
%% Find indexes where string characters are members of alphabet
[~,index_small] = ismember(s,letters_small);
[~,index_capital] = ismember(s,letters_capital);
%% Combine to find total unique sorted indexes
index = [index_small index_capital];
index_unique = unique(index);
%% Remove zeros (unnecessary)
index_unique(index_unique == 0) = [];
%% Check to pangram condition
array_check = 1:26;
tf = isequal(index_unique,array_check)
end
Replace NaN’s with Numbers using Matlab
The number that appears to the left of NaNs in the row should be substituted.
Challenge: The first non-NaN value immediately to the left of the leftmost NaN shall take the place of any subsequent NaNs if there is more than one. Set the default value to zero if the NaN is in the first column.
Example:
x = [NaN 1 2 NaN NaN 17 3 -4 NaN]
then
y = [ 0 1 2 2 2 17 3 -4 -4]
Code Solution:
function out = replace_nans(in)
out = in;
%% Starting from the end & approach to the start
for i = length(out):-1:1
if isnan(out(i)) == 1
out(i) = checkPrevious(out,i);
else
continue;
end
end
%% Recursion function
function out_value = checkPrevious(A,k)
if k == 1
out_value = 0;
else
if isnan(A(k-1)) == 1
out_value = checkPrevious(A,k-1);
else
out_value = A(k-1);
end
end
end
end
Palindrome Number in Matlab
For example, 323 is a palindrome. Some numbers, such as 124, aren’t. However, notice what occurs when we add that number to a copy of itself that has been inverted.
Challenge: Create a Palindrome program in Matlab
Code Solution:
function new_a = find_palindrome(a)
a_str = num2str(a);
status_palindrome = check_palindrome(a_str);
%% Recursion to find palindrome integer
if status_palindrome == false
new_a = str2num(a_str) + str2num(flip(a_str));
new_a = find_palindrome(new_a);
else
new_a = a;
end
%% Function to check palindrome: symmetry of string
function palindrom_status = check_palindrome(str_num)
for i = 1:length(str_num)/2
if strcmp(str_num(i),str_num(end+1-i)) == 1
palindrom_status = true;
else
palindrom_status = false;
end
end
end
end
Knight’s Tour Checker in Matlab
Challenge: Find out if there is a lawful knight’s tour in a given matrix. The knight’s tour does not have to fill the entire matrix, but it always follows the pattern 1, 2, 3,… Zeros are present in any unused squares.
If a knight’s trip is represented by the counting sequence from 1 to n, your function should return true; otherwise, it should return false.
Example:
The following matrix is a knight’s tour of the law. Despite being inaccessible, the middle square satisfies the criteria because it contains a zero. TRUE should be the function’s return value.
This is another knight’s legitimate tour, albeit brief. There will always be at least one move (i.e., the counting sequence [1 2]) in the test suite. Keep in mind that a square matrix is not necessary.
This is an unauthorized knight’s tour. Up until the jump from row 14 to row 15, which is unlawful because it goes from row 4 to row 1, everything is OK.
Code Solution:
function tf = knights_tour(a)
%% Find all nonzero elements and their number
[r,c,ind] = find(a);
num_elems = numel(find(a));
%% Make an array of: index, row and col
cells = zeros(num_elems,3);
cells(:,1) = ind;
cells(:,2) = r;
cells(:,3) = c;
%% Sort according to ind
cells_sorted = sortrows(cells);
%% Set default state
tf = true;
for i = 1:size(cells_sorted,1)-1
%% Knight move is ‘L’shaped as defined here
if (abs(cells_sorted(i+1,2)-cells_sorted(i,2)) == 1) && (abs(cells_sorted(i+1,3)-cells_sorted(i,3)) == 2) …
|| (abs(cells_sorted(i+1,2)-cells_sorted(i,2)) == 2) && (abs(cells_sorted(i+1,3)-cells_sorted(i,3)) == 1)
%% Skip correct knight moves
else
%% Set state to false once incorrect knight move occurs
tf = false;
end
end
end
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Conclusion
We hope this article will be useful to you for the practical challenges of Matlab. Make use of these solutions and get expertise. If you are completely new, join SLA for the best Matlab training in Chennai.
