Regular matrix and non-singular matrix

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Noa Yelin
Noa Yelin 2020-10-20
评论： Steven Lord 2020-10-20
Hey
I need to write a function that the user enters a matrix, and the function returns "1" if the matrix is reversible(regular) and "0" if it's not.
I wrote this function-
function x=irr_mat(A)
if isequal(A,zeros(n))
x=0;
else
if size(A,1)==size(A,2)
x=1;
else
x=0;
end
end
end
n is the array of the matrix.
and I got this note-
Error in irr_mat (line 3)
if isequal(A,zeros(n))
Error in Untitled5 (line 3)
irr_mat(A)
any help?
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Noa Yelin
Noa Yelin 2020-10-20
i dont get A 4X4. I got -
n =
4 4
ans =
1
I need to get matrix A with 4 rows and 4 columns
Steven Lord
Steven Lord 2020-10-20
What specifically do you mean by "reversible(regular)"? Which of the following count as reversible / regular and why do they count or not count?
A1 = 1
A2 = 42
A3 = 99
A4 = 12321
A5 = [1 2; 3 4]
A6 = [1 23; 23 1]
A7 = [98 89; 764 467]
A8 = [1 2 3 4; 5 6 7 8; 9 10 10 9; 8 7 6 5; 4 3 2 1]

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