Recent questions tagged linear

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linear regression - Why does the number of rows change during AIC in R? How to ensure that this doesn't happen?

I'm trying to find a minimal adequate model using AIC in R. I keep getting the following error: Error in step(model) : number of ... , NA, NA, NA, NA, 2683L, NA, NA, 1775L, NA,...

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

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linear algebra - How to do Gaussian elimination in R (do not use "solve")

A <- matrix(c(2,-5,4,1,-2.5,1,1,-4,6),byrow=T,nrow=3,ncol=3) b <- matrix(c(-3,5,10),nrow=3, ... R. Help me with some fix. Thank you 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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linear algebra - How to do Gaussian elimination in R (do not use "solve")

A <- matrix(c(2,-5,4,1,-2.5,1,1,-4,6),byrow=T,nrow=3,ncol=3) b <- matrix(c(-3,5,10),nrow=3, ... R. Help me with some fix. Thank you 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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485 views

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linear algebra - LAPACK SVD (Singular Value Decomposition)

Do yo know any example to use LAPACK To calculate SVD? See Question&Answers more detail:os...

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

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619 views

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linear algebra - Is there a simple algorithm for calculating the maximum inscribed circle into a convex polygon?

I found some solutions, but they're too messy. See Question&Answers more detail:os...

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

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384 views

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linear programming in python?

I need to make a linear programming model. Here are the inequalities I'm using (for example): 6x + 4y ... for linear programming in Python? See Question&Answers more detail:os...

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

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538 views

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linear interpolation - Resampling data with gnuplot

In some cases you might need to resample your data. How can this be done platform-independently with gnuplot? Below ... end of code The result: See Question&Answers more detail:os...

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

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386 views

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linear algebra - Calling MATLAB's built-in LAPACK/BLAS routines

I want to learn how to call the built-in LAPACK/BLAS routines in MATLAB. I have experience in MATLAB and ... or LU decomposition is welcome. See Question&Answers more detail:os...

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

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linear regression - lm function in R does not give coefficients for all factor levels in categorical data

I was trying out linear regression with R using categorical attributes and observe that I don't get a coefficient value for ... WA 1 1 0 1 NA See Question&Answers more detail:os...

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

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