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% Line starting with "%" is called a comment in MATLAB, this line is ignored by the compiler. Almost all programming language has comment feature. In C, we give comments via "//" and in Python via "#".
% row matrix
% comma or space is used to separate elements of a row
r_matrix1 = [2 4 5 6 7]
r_matrix2 = [2, 4, 5, 6, 7]
% column matrix
% semicolon is used to separate rows
c_matrix = [2; 3; 4; 5; 7]
% 3*3 square matrix
sq_matrix = [1 2 3; 4 5 6; 7 8 9]
% diagonal matrix
diag_matrix1 = [1 0 0; 0 2 0; 0 0 3]
% D = diag(v) returns a square diagonal matrix with the elements of vector v on the main diagonal.
diag_matrix2 = diag(r_matrix1)
diag_matrix3 = diag([1,2,3])
%Addition, Subtraction, Multiplication
m1 = [10 2 3; 14 5 6; 1 8 9]
m2 = [-11 7 8; 14 -5 6; 0 -1 9]
sum = m1 + m2
diff = m1 - m2
mul = m1 * m2
%Matrix divison in MATLAB has two types - right division, left divsion
%Matrix right division. B/A is roughly the same as B*inv(A). More precisely, B/A = (A'\B')'.
rdiv = m1/m2
%matrix left division. If A is a square matrix, A\B is roughly the same as inv(A)*B.
ldiv = m1\m2
%determinant
m = [ 1 2 3; 2 3 4; 1 2 5]
d = det(m)
%transpose
mT = m'
%inverse
mI = inv(m)
%If the matrix is singular i.e. the determinant of the matrix is zero, then the inverse does not exist.
m2 = [0 0; 0 0] % 2*2 matrix
d2 = det(m2) % determinant will be 0
mI2 = inv(m2) % inverse not possible, so you will warning by MATLAB coz of this
%Eigenvalue
% e = eig(A) returns a column vector containing the eigenvalues of square matrix A.
e = eig(m) % matrix m is defined earlier as [ 1 2 3; 2 3 4; 1 2 5]
%Operations
A = [1 2 3; 2 3 4; 1 2 5]
B = [-3 4 7; 5 8 -2; 0 1 3]
% X^p is X to the power p, if p is a scalar. If p is an integer, the power is computed by repeated squaring. You will learn about this method in Algorihtm course.
result1 = (A + B)^2 % could have done this also: (A + B) * (A + B)
result2 = A^2 + B^2 % could have done this also: A*A + B*B
result3 = A' * B'
result4 = B' * A
result5 = A^2 + B^2 - A*B + B'*A'
det_AB = det(A*B)
det_BA = det(B*A)
S = 'HEX to BIN';
disp(S)
HEX='4fcb0fb818159a00'
hex_to_bin=dec2bin(hex2dec(HEX));
printf("BIN = %s\n",hex_to_bin)
printf("LEN = %d\n",length(hex_to_bin))
%disp(hex_to_bin)
%for i = (length(hex_to_bin)):-1:1
for i = 1:(length(hex_to_bin))
y=str2num(hex_to_bin(i));
x=[i-1,y];
disp(x)
new_arr(1,i)=i-1;
new_arr(2,i)=num2str(y);
end
x = [1 2 3 4 5 6 7 8 9 10];
disp(x)
index = 1;
while 1
if (index +1) > (length(x))
% End of array
break
end
if (x(index)) - x(index +1) < -2
% Pass it.
break
end
disp(x(index));
index++;
end
