55
votes
4
answers
1.3K
views
Function for 'does matrix contain value X?'
Is there a built in MATLAB function to find out if a matrix contains a certain value? (ala PHP's in_array
55
votes
7
answers
1.8K
views
How can I count the number of elements of a given value in a matrix?
Does anyone know how to count the number of times a value appears in a matrix? For example, if I have a 1500
57
votes
8
answers
398
views
How do I iterate through each element in an n-dimensional matrix in MATLAB?
I have a problem. I need to iterate through every element in an n-dimensional matrix in MATLAB. The problem is
55
votes
11
answers
842
views
How can I apply a function to every row/column of a matrix in MATLAB?
You can apply a function to every item in a vector by saying, for example, v + 1, or you can use the function
51
votes
12
answers
1.9K
views
Why is MATLAB so fast in matrix multiplication?
I am making some benchmarks with CUDA, C++, C#, Java, and using MATLAB for verification and matrix generation.
68
votes
9
answers
456
views
How can I index a MATLAB array returned by a function without first assigning it to a local variable?
For example, if I want to read the middle value from magic(5), I can do so like this: M = magic(5); value = M
58
votes
4
answers
2.7K
views
How to transform numpy.matrix or array to scipy sparse matrix
For SciPy sparse matrix, one can use todense() or toarray() to transform to NumPy matrix or array. What are th
54
votes
7
answers
1.3K
views
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 multiplica
62
votes
5
answers
560
views
What are the differences between numpy arrays and matrices? Which one should I use?
What are the advantages and disadvantages of each? From what I've seen, either one can work as a replace
