How to search in 2D array by LINQ ?[version2]
I have an 2D array like this:
multidimensional-array
How to define a two-dimensional array?
I want to define a two-dimensional array without an initialized length like this:
Using numpy to build an array of all combinations of two arrays
I’m trying to run over the parameters space of a 6 parameter function to study its numerical behavior before trying to do anything complex with it, so I’m searching for an efficient way to do this.
Difference between numpy.array shape (R, 1) and (R,)
In numpy, some of the operations return in shape (R, 1) but some return (R,). This will make matrix multiplication more tedious since explicit reshape is required. For example, given a matrix M, if we want to do numpy.dot(M[:,0], numpy.ones((1, R))) where R is the number of rows (of course, the same issue also occurs column-wise). We will get matrices are not aligned error since M[:,0] is in shape (R,) but numpy.ones((1, R)) is in shape (1, R).
Matrix Transpose in Python
The built-in function zip does a similar job, but truncates the result
to the length of the shortest list, so some elements from the original
data may be lost afterwards.
Understanding NumPy’s einsum
I’m struggling to understand exactly how einsum works. I’ve looked at the documentation and a few examples, but it’s not seeming to stick.
How to initialize a two-dimensional array in Python?
I’m beginning python and I’m trying to use a two-dimensional list, that I initially fill up with the same variable in every place. I came up with this:
Intuition and idea behind reshaping 4D array to 2D array in NumPy
While implementing a Kronecker-product for pedagogical reasons (without using the obvious and readily available np.kron()), I obtained a 4 dimensional array as an intermediate result, which I’ve to reshape to get the final result.
How to count the occurrence of certain item in an ndarray?
In Python, I have an ndarray y
that is printed as array([0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1])
What is the difference between flatten and ravel functions in numpy?
flatten is a method of an ndarray object and hence can only be called for true numpy arrays.