Need some help with my function.

Hello!

I have this function as shown below. Please note that from inverse_(A,B,C) to the end if the if statements are correct.

function [inverse_A, inverse_B, inverse_C]=nonsingular(A, B, C)


inverse_A=nonsingular(A)
A=[2 -1 ; 4 5];
Determinant_A=det(A);
if Determinant_A==0
    inverse_A=[]
    disp('Matrix A does not have an inverse')
else
    Inverse_A=inv(A);
    disp('Inverse of Matrix A')
    disp(Inverse_A)
end


inverse_B=nonsingular(B)
B=[4 2 ;2 1];
Determinant_B=det(B);
if Determinant_B==0
    inverse_B=[]
    disp('Matrix B does not have an inverse')
else
    Inverse_B=inv(B);
    disp('Inverse of Matrix B')
    disp(Inverse_B)
end



inverse_C=nonsingular(C)
C=[2 0 0;1 2 2;5 -4 0];
Determinant_C=det(C);
if Determinant_C==0
    inverse_C=[]
    disp('Matrix C does not have an inverse')
else
    Inverse_C=inv(C);
    disp('Inverse of Matrix C')
    disp(Inverse_C)
end

 end

And I need this function to be called nonsingular and be a seperate m file. This m file will be called in my code as shown here.

 
A=[2 -1 ; 4 5];
B=[4 2 ;2 1];
C=[2 0 0;1 2 2;5 -4 0];

% This is the function for Matrix A
nonsingular(A)

% This is the function for Matrix B
nonsingular(B)

% This is the function for Matrix C
nonsingular(C)

Do you all know what im doing wrong? Please let me know.

Answer 1

[Image Analyst]

You're calling nonsingular() recursively. That is, inside it, it's calling itself. However you define it to take 3 input arrays, yet when you call it you pass it only one instead of 3.

Why are you calling it recursively in the first place, and even if you did, why are you not passing the correct number of arguments? And you don't have any way to "back out" of the recursive calls so it will just go deeper and deeper.

Maybe you should just comment out the lines

inverse_A=nonsingular(A)
inverse_B=nonsingular(B)
inverse_C=nonsingular(C)

Answer 2

[KSSV]

function inverse_A=nonsingular(A)
Determinant_A=det(A);
if Determinant_A==0
    inverse_A=[]
    disp('Matrix A does not have an inverse')
else
    Inverse_A=inv(A);
    disp('Inverse of Matrix A')
    disp(Inverse_A)
end

Save the above in a file. This your function. Call the function as shown below.

 
A=[2 -1 ; 4 5];
B=[4 2 ;2 1];
C=[2 0 0;1 2 2;5 -4 0];

% This is the function for Matrix A
invA = nonsingular(A) ; 

% This is the function for Matrix B
invB = nonsingular(B) ; 

% This is the function for Matrix C
invC = nonsingular(C) ; 

[Daniel Vonderhaar]

Hello! Thank you for your help! now I have one last question...

Inverse of Matrix A
    0.3571    0.0714
   -0.2857    0.1429


Inverse_A =

     []

Matrix A does not have an inverse
Inverse of Matrix A
    0.5000         0         0
    0.6250    0.0000   -0.2500
   -0.8750    0.5000    0.2500

as you can see when I run this code, (So glad it works this much!) this part

   Inverse_A =

     []

Matrix A does not have an inverse
Inverse of Matrix A
    0.5000         0         0
    0.6250    0.0000   -0.2500
   -0.8750    0.5000    0.2500

is supposed to look like this....

Inverse_B =

     []

Matrix B does not have an inverse
Inverse of Matrix C
    0.5000         0         0
    0.6250    0.0000   -0.2500
   -0.8750    0.5000    0.2500

How do I make it look like that when I run it every time?