1
GATE CSE 1997
+2
-0.6
Let $$A = ({a_{ij}})$$ be and n-rowed square matrix and $${I_{12}}$$ be the matrix obtained by interchanging the first and second rows of the n-rowed Identity matrix. Then$${AI_{12}}$$ is such that its first
A
row is the same as its second row
B
row is the same as the second row of A
C
column is the same as the second column A
D
row is all zero
2
GATE CSE 1996
+2
-0.6
The matrices$$\left[ {\matrix{ {\cos \,\theta } & { - \sin \,\theta } \cr {\sin \,\,\theta } & {\cos \,\,\theta } \cr } } \right]\,\,and$$
$$\left[ {\matrix{ a & 0 \cr 0 & b \cr } } \right]\,$$ commute under multiplication
A
if a = b or $$\theta = n\,\pi$$, n an integer
B
always
C
never
D
if a cos $$\theta \,\, \ne \,\,b\,\,\sin \,\theta$$
3
GATE CSE 1994
+2
-0.6
If A and B are real symmetric matrices of size n x n. Then, which one of the following is true?
A
$$A{A^t} = I$$
B
$$A = A - 1$$
C
AB = BA
D
$${(AB)^T} = {B^T}{A^T}$$
4
GATE CSE 1994
+2
-0.6
In a compact single dimensional array representation for lower triangular matrices (i.e., all the elements above the diagonal are zero) of size $$n$$ $$x$$ $$n$$, non-zero elements (i.e., elements of the lower triangle) of each row are stored one after another, starting from the first row, the index of the $${\left( {i,\,j} \right)^{th}}$$ element of the lower triangular matrix in this new representation is
A
$${i+\,j}$$
B
$${i + j - 1}$$
C
$$j + {{i\left( {i - 1} \right)} \over 2}$$
D
$$i + {{j\left( {j - 1} \right)} \over 2}$$
GATE CSE Subjects
EXAM MAP
Medical
NEET