when i created numpy 2d array i can access individual elements by [row][column] but when i converted it into a matrix by np.mat() then why i cant access to the individual elements by [row][column]
a=np.array([[1,2,3],[4,5,6],[7,8,9]])
a=np.mat(a)
print(a[0])
print(a[0][0])
the output is
[1,2,3]
[1,2,3] for both why it is so
hey @amankharb ,
Actually the thing is , np.mat have got different ways to access the data/values.
Taking the same above code of yours:
for numpy array:
a=np.array([[1,2,3],[4,5,6],[7,8,9]])
print( a[0] ) : output as [1,2,3]
print( a[0][0] ) : output as 1
and for matrix:
a=np.mat(a)
print( a[0] ) : output as [ [1,2,3] ]
print(a[0,0]) : output as 1
the thing is matrix ignores further indexing after a square bracket , hence we get the same results.
You can also perform slicing in the same way too like an example:
print( a[ :2, :2 ] ) # slicing to take first 2 rows and first 2 columns
output as:
[[1 2]
[4 5]]
I hope this might have resolved your doubt.