Recent questions tagged Matrix

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matrix - Generate multivariate normal r.v.'s with rank-deficient covariance via Pivoted Cholesky Factorization

I'm just beating my head against the wall trying to get a Cholesky decomposition to work in order to simulate ... sd) ## Not all ones! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - C++: expected identifier before numeric constant

I'm trying to write a small program using MTL, but I'm getting the mentioned error when I try to make a ... s where the error occurred for me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Running several linear regressions from a single dataframe in R

I have a dataset of export trade data for a single country with 21 columns. The first column indicates the ... examples. Thanks in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix multiplication - Multiplying values from two different dictionaries together in Python

I have two separate dictionaries with keys and values that I would like to multiply together. The values should be ... would be great. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - rbind/data.frame conversion type hierarchy R

Could anyone systematically explain to me the hierarchy of type conversion between character/numeric/factor while using ... "numeric" "factor" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Matplotlib python change single color in colormap

I use the colormap in python to plot and analyse values in a matrix. I need to associate the white color to each ... to obtain what I'd like? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Efficient ways to append new data in Matlab (with example code)

I am looking for methods, built-in functions, good practices... to append new data to a matrix - when the rows ... double] dates: [7 1 double] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - R: add matrices based on row and column names

I have two matrices I want to sum based on their row and column names. The matrices will not necessarily have all rows and ... 1 6 w b 1 etc... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Sort MATLAB array in descending order

I am using MATLAB. I have a question about how to sort an matrix in descending order along one column of a matrix and ... 30; 5 20; 3 10] Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - LU decomposition with partial pivoting Matlab

I am trying to implement my own LU decomposition with partial pivoting. My code is below and apparently is working fine, ... = Ak(:,end); return See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - System is computationally singular: reciprocal condition number in R

x <- matrix(rnorm(80, mean = 0, sd = 0.1), 8, 8) c <- cov(x) solve(c) I get the error message: ... -95, but it is still invertible with solve(). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - JavaFX 8 Transform to pitch, yaw and roll rotation angles

Implementing the answer from this thread I have this code that translates the deltayaw, deltaroll and deltapitch angles ... help would be great. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix multiplication - Cache friendly method to multiply two matrices

I intend to multiply 2 matrices using the cache-friendly method ( that would lead to less number of misses) I ... I know how to achieve this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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713 views

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matrix - Power Method in MATLAB

I would like to implement the Power Method for determining the dominant eigenvalue and eigenvector of a matrix in ... I making some mistake? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Matlab: First Non-zero element of each row or column

For example, A = [ -1 0 -2 0 0 2 8 0 1 0 0 0 3 0 -2 0 -3 2 0 0 1 2 0 0 -4]; how can I get a vector of the first nonzero elements of each row? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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matrix - Cartesian product in MATLAB

Here is the simplified version of the problem I have. Suppose I have a vector p=[1 5 10] and another one q= ... Product. How can I do that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - combining two plots in r

Here are two plots I intend to combine: First is half matrix of heatmap plot. ................... ... figure later...help much appreciated... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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586 views

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matrix - Android ImageView - Get coordinates of tap (click) regardless of scroll location or zoom scale

Background: I have an ImageView that I've modified to be scrollable (drag) and zoom-able (pinch zoom). I used the ... area. How can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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593 views

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matrix - whats the fastest way to find eigenvalues/vectors in python?

Currently im using numpy which does the job. But, as i'm dealing with matrices with several thousands of rows ... kind of calculations faster ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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441 views

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matrix - Why do I get "Unspecified Launch failure" in CUDA program, multiplying 2 matrices

I am new to CUDA. When I multiply the 1024x1024 matrix, and launch a kernel with: multiplyKernel << <dim3( ... (dev_b); return cudaStatus; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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493 views

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matrix - Multiplying two matrices in R

I have 2 matrices. The first one: [1,2,3] and the second one: [3,1,2 2,1,3 3,2,1] I'm looking for a ... 13, 10] In R, mat1%*%mat2 don't work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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717 views

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matrix - How to get Exponent of Scientific Notation in Matlab

When the numbers are really small, Matlab automatically shows them formatted in Scientific Notation. Example: A = rand( ... you for your help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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614 views

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matrix - Transpose in perl

I have started learning perl and like to try out new things. I have some problem in text processing. I have some ... in perl? Thank you all. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Algorithm for equiprobable random square binary matrices with two non-adjacent non-zeros in each row and column

It would be great if someone could point me towards an algorithm that would allow me to : create a random ... the partition that was chosen. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matrix - Is there a standard solution for Gauss elimination in Python?

Is there somewhere in the cosmos of scipy/numpy/... a standard method for Gauss-elimination of a matrix? One ... "trusted" modules if possible. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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590 views

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matrix multiplication - 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 ... work out will be really helpful for an RGB case. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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441 views

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matrix - Can we get factor matrices in R?

It seems not possible to get matrices of factor in R. Is it true? If yes, why? If not, how should I do? f < ... of f # should I worry about it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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363 views

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matrix - MySQL query to create a pivot table by joining 4 different table

I have 4 mySQL tables namely Exams, Marks, Student and Subject. Sql with data is provided below. I need the ... G_016', 116, 'E_100000030'); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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