Top "Matrix-multiplication" questions

Questions related to matrix multiplication, especially implementation.

How is a convolution calculated on an image with three (RGB) channels?

Say we have a single channel image (5x5) A = [ 1 2 3 4 5 6 7 8 9 2 1 4 5 6 3 4 5 6 7 4 3 4 5 6 2 ] And a filter K (2x2) K = [ 1 1 1 1 ] An example of applying convolution (…

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What is R's multidimensional equivalent of rbind and cbind?

When working with matrices in R, one can put them side-by-side or stack them top of each other using cbind …

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MATLAB: How to vector-multiply two arrays of matrices?

I have two 3-dimensional arrays, the first two dimensions of which represent matrices and the last one counts through a …

arrays matlab matrix vectorization matrix-multiplication
Matrix multiplication: Small difference in matrix size, large difference in timings

I have a matrix multiply code that looks like this: for(i = 0; i < dimension; i++) for(j = 0; j < …

c performance algorithm matrix-multiplication
loop tiling/blocking for large dense matrix multiplication

I was wondering if someone could show me how to use loop tiling/loop blocking for large dense matrix multiplication …

c performance openmp sse matrix-multiplication
Difference between numpy.dot and a.dot(b)

Is there a difference between import numpy as np np.dot(a,b) and a.dot(b) internally? I wasn't …

python numpy matrix-multiplication
Matrix Multiplication of a Pandas DataFrame and Series

I want to do a matrix multiplcation of a pandas dataframe and a series df = pandas.DataFrame({'a':[4,1,3], 'b':[5,2,4]},index=[1,2,3]) …

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How to implement fast image filters on iOS platform

I am working on iOS application where user can apply a certain set of photo filters. Each filter is basically …

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Efficient multiplication of very large matrices in MATLAB

I don't have enough memory to simply create a diagonal D-by-D matrix, since D is large. I keep getting an …

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Recursive matrix multiplication

I am reading Introduction to Algorithms by CLRS. Book shows pseudocode for simple divide and conquer matrix multiplication: n = A.…

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