Recent questions tagged matrix

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matrix - Filing the entire volume of a cube with small cubes in MATLAB

I have built a hollow cube in MATLAB, I want to completely fill its volume with small cubes. Then I ... this neighborhood matrix. Thanks. See Question&Answers more detail:os...

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

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matrix - Shortcut using lm() in R for formula

It is possible to use a shortcut for formula in lm() m <- matrix(rnorm(100), ncol=5) lm(m[,1] ~ m ... to avoid having to write the long formula? See Question&Answers more detail:os...

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

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matrix - matlab - how to merge/interlace 2 matrices?

How can I combine 2 matrices A, B into one so that the new matrix C = row 1 of A, followed by row 1 of B, then row 2 ... 5 5 5; 4 5 6; 8 8 8]. See Question&Answers more detail:os...

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

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matrix - Orient object's rotation to a spline point tangent in THREE.JS

I am using SplineCurve3 to plot a line only on the X and Y axis, I have a cube successfully animating along ... can edit my - jsfiddle example See Question&Answers more detail:os...

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

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matrix multiplication algorithm time complexity

I came up with this algorithm for matrix multiplication. I read somewhere that matrix multiplication has a time complexity of o( ... [k]*b[k][j] See Question&Answers more detail:os...

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

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matrix - How do I double the size of a vector in MATLAB with interpolation?

Essentially, if I have the following matrix: [1, 2, 3 ,4, 10] I need to explode it whilst interpolating, as ... just 1 value as we have here. See Question&Answers more detail:os...

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

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matrix - How to calculate adjacency matrices in R

I have this data. I want to calculate Adjacency matrices in R. How can I do this? V1,V2,V3 are columns.V1 ... 164885 24 [3] 431072 431072 5 See Question&Answers more detail:os...

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

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matrix - Why are quaternions used for rotations?

I'm a physicist, and have been learning some programming, and have come across a lot of people using ... over vectors or other alternatives? See Question&Answers more detail:os...

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

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matrix - MATLAB find and apply function to values of repeated indices

I have a 352x11 matrix, indexed by column 1 with 10 data points. Some of the index values are repeated. I'd like ... x, but where do I begin? See Question&Answers more detail:os...

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

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matrix - MATLAB eig returns inverted signs sometimes

I'm trying to write a program that gets a matrix A of any size, and SVD decomposes it: A = U * S * V' Where ... -0.4046,-0.9145;-0.9145,0.4046] See Question&Answers more detail:os...

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

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matrix - Finding row index containing maximum value using R

Given the following matrix lets assume I want to find the maximum value in column two: mat <- matrix(c(1:3,7:9 ... index, in this case row two? See Question&Answers more detail:os...

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

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matrix - Scale and mirror SVG object

How do I most easily first scale an object, say 2 * times it's current size and then flip it vertically and ... , as a format to export to. See Question&Answers more detail:os...

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

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