What does “unary minus” mean for Matrices
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05-07-2019 - |
Question
When we're talking about matrices or a matrix, what does "unary minus" stand for as an arithmetic operator?
Solution
The matrix A with all the elements negated.
That way, A + (-A) == 0.
Edit: here's the source from http://math.nist.gov/javanumerics/jama/">JAMA:
/** Unary minus
@return -A
*/
public Matrix uminus () {
Matrix X = new Matrix(m,n);
double[][] C = X.getArray();
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
C[i][j] = -A[i][j];
}
}
return X;
}
Edit 2: if A is
1 2
3 4
then unary minus of A is
-1 -2
-3 -4
OTHER TIPS
If M is your matrix, -M is the new matrix where unary minus has been applied
(-M)[i, j] = - (M [i, j])
"unary minus" for a matrix is an element by element negation as others has said.
More generally, in computer science, a "unary operator" is one that operates on a single operand. Other common examples from C include the '++' or '=*' unary operators.
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