How to present the determinant and eigenvalue using FprintF function

m1 = [7 3; 3 -1] % Matrix

% B. 
syms L % Symbol representing λ

% C
I = eye(2) % Identity matrix

% D
LI = I * L % Multiplying λ with the Identity matrix

% E
m2 = m1 - LI % Subtracting matrix 1 with lI

d2 = det(m2) % Finding determinant
d3 = solve(d2) % Solving the polynomial function of the determinant

How can I present the results of d2 and d3 using the fprintf function?

Answer 1

[William Rose]

@Jonas Morgner,

You can display the symbolic d2 and d3 using fprintf() as shown below. Note that d2 is a string variable, so I use "%s" in the fprintf() command, and d3 is numeric, so I use "%d". I could use "%.1f" or a similar variation for displaying d3, if I wanted decimal places.

syms L % Symbol representing λ
m2 = [7 3; 3 -1] - L*eye(2);
d2 = det(m2); % Finding determinant
d3 = solve(d2); % Solving the polynomial function of the determinant
fprintf('Determinant=%s\n',d2);

Determinant=L^2 - 6*L - 16

fprintf('d3=%d, %d\n',d3)

d3=-2, 8

or as follows

fprintf('d3=%d, %d\n',d3(1),d3(2))

d3=-2, 8

Try it.

[Jonas Morgner]

Awesome thank you very much :)