# Questions tagged [matrix]

A matrix is a collection of numbers arranged into a fixed number of rows and columns.

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### Selecting Data from 2 Dimensional Empirical Data Set in Excel

I have a set of efficiency values based on 2 dependent variables (speed and torque). These numbers are provided from the manufacturer and I want to fit the efficiency values to a set of personal test ...
1 vote
10 views

### memory error- python N-th order Markovian transition matrix from a given sequence

Ok. What is wrong with you code! I am trying to calculate transition probabilities for each leg. The code works for small array but for the actual dataset I got memory error. I have 64 g version ...
1 vote
26 views

### How to compute backpropagation gradient according chain rule for using vector/matrix differential?

I have some problems for computing derivative for sum of squares error in backprop neural network. For example, we have a neural network as in picture. For drawing simplicity, i've dropped the sample ...
14 views

### Creating a Collaboritve Filtering with No Ratings for a football player Recommender System

I'm creating a recommendation system of football players based on stats of each player (number of passes, crosses, shots, tackles, etc ...) and I have already tried with a Content based recommender. ...
30 views

### Build autoencoder for single matrix with integer numbers

Can you please tell me how to build an autoencoder with a single matrix(4,4) with integer numbers? I want to build an autoencoder for the below-mentioned data. I don't know whether I should convert ...
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### Block matrix indexing

Hello this might be a stupid question but i need some help indexing a Matlab matrix consisting of several sub-matrices. ...
53 views

### How is image convolution actually implemented in deep learning libraries using simple linear algebra?

As a clarifier, I want to implement cross-correlation, but the machine learning literature keeps referring to it as convolution so I will stick with it. I am trying to implement image convolution ...
570 views

### Creating & handling large matrices in python? [closed]

I need to create a large matrix of size 400,000*400,000 and do some transformation on it. I am not able to do it using python in my laptop due to memory constraints. What technologies I can use to ...
20 views

### ML for data processing. What are the options?

Currently I am working on improving a stage on a data processing pipeline. The source data has a large number of fields and is getting normalized into a simpler entity. This entails that in many cases ...
• 101
22 views

### Represent Neural Network as matrix calculation (Transformer Feed Forward NN)

for better understanding, I would like to represent the calculations in a neural network with one hidden layer and one output layer as a matrix calculation. The hidden layer has 3072 neurons, the ...
19 views

1 vote
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### How does on test regression for a subspace or matrix factorization?

I've recently been reading a lot of papers and watching a lot of videos on both subspace learning, and matrix factorization. One thing is particularly eluding me though - how does any of this get ...
• 141
1 vote
387 views

### Having difficult interpreting the eigenvectors for a simple 3x2 matrix

I calculated the eigenvectors and eigenvalues from a covariance matrix given a data matrix of 3 columns and 2 rows. I am trying to interpret results but I can't understand on how to interpret them. ...
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