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linear algebra - Why is Matlab's inv slow and inaccurate?

I read at a few places (in the doc and in this blog post : http://blogs.mathworks.com/loren/2007/05/16 ... someone here could guide me. 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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605 views

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linear programming - Blend : minimize weight but keep it robust

I need to build an object. The object is a mixture of 3 elements. I need to minimize the object ... stackoverflow.com/questions/65829711/blend-minimize-weight-but-keep-it-robust...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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688 views

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linear programming - Adding constrain to check if there exist a combination of pairs such that it statisfy a ratio?

Lets say I have a set of items in a set x0, ..., x14 each consisting its own values v0, ..., v14 I am ... -constrain-to-check-if-there-exist-a-combination-of-pairs-such-that-it-sta...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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512 views

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linear programming with python

I'am trying to solve a following problem. In fact, this is Least Absolute Deviation Regression problem. ... ://stackoverflow.com/questions/65847729/linear-programming-with-python...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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linear programming - "gurobipy.gurobipy.GurobiError: Invalid argument to LinExpr multiplication"

I tried to write an objective function but I got error like "gurobipy.gurobipy.GurobiError: Invalid ... /gurobipy-gurobipy-gurobierror-invalid-argument-to-linexpr-multiplication...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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444 views

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linear algebra - Efficient algorithm to find max points on a line given a collection of Vector3 points?

I am trying to figure out an efficient algorithm to detect the most points on the same line given a collection of N ... find-max-points-on-a-line-given-a-collection-of-vector3-p...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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641 views

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linear algebra - Calculation mistakes of SparseLU in Eigen (C++)

Recently I found that in some certain circumstances, the SparseLU solver will get the wrong answer. I give an ... com/questions/65912200/calculation-mistakes-of-sparselu-in-eigen-c...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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791 views

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linear algebra - numpy.linalg.eig does not find obvious eigen vector

I have a matrix A as below: A Out[34]: array([[1, 1, 1, 1, 0, 0, 0, 0], [1, 1, ... https://stackoverflow.com/questions/65950798/numpy-linalg-eig-does-not-find-obvious-eigen-vector...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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676 views

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linear programming - I'd like to use attributes of r function at Rcpp

This is my cpp code.. using lp function (with lpSolve package) I'd like to assign the 'solution' attribute of ... questions/65952624/id-like-to-use-attributes-of-r-function-at-rcpp...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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517 views

1 answer

linear programming - Solution region of a system of inequalities in R

I have a system of inequalities Ab >= 0, where A is a n by p matrix, b and 0 are vectors of ... .com/questions/65946081/solution-region-of-a-system-of-inequalities-in-r...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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614 views

1 answer

linear programming - How can I change the output of the lp_solver on Linux to show large numbers instead of scientific notation?

I'm working with the lp_solver on ubuntu on some examples. Most of them are based on big prodution problems. Every time ... -of-the-lp-solver-on-linux-to-show-large-numbers-inst...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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413 views

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linear searching with two letters python

I have this program which should return (using linear searching) a list of all instances of single characters ... .com/questions/65649589/linear-searching-with-two-letters-python...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

698 views

1 answer

linear programming - Solving MIP efficiently problems with z3

I have a reasonably simple MILP (mixed integer linear program): https://0bin.net/paste/B1IE5l8l#2YLLrptC-l1ml+ ... .com/questions/66056792/solving-mip-efficiently-problems-with-z3...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

617 views

1 answer

linear programming - Solving MIP efficiently problems with z3

I have a reasonably simple MILP (mixed integer linear program): https://0bin.net/paste/B1IE5l8l#2YLLrptC-l1ml+ ... .com/questions/66056792/solving-mip-efficiently-problems-with-z3...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

503 views

1 answer

linear regression - how to test for interaction effect with two categorical independent variables and a time series dependent variable

I have two independent variables: Group (Treatment & Control) and Block (Stressor 1 and Stressor 2). I ... test-for-interaction-effect-with-two-categorical-independent-variables-an...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

575 views

1 answer

linear regression - how to test for interaction effect with two categorical independent variables and a time series dependent variable

I have two independent variables: Group (Treatment & Control) and Block (Stressor 1 and Stressor 2). I ... test-for-interaction-effect-with-two-categorical-independent-variables-an...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

522 views

1 answer

linear searching with two letters python

I have this program which should return (using linear searching) a list of all instances of single characters ... .com/questions/65649589/linear-searching-with-two-letters-python...

asked Jul 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

470 views

1 answer

linear searching with two letters python

I have this program which should return (using linear searching) a list of all instances of single characters ... .com/questions/65649589/linear-searching-with-two-letters-python...

asked Jul 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

762 views

1 answer

linear algebra - How to create a set of output data that can be graphed for a range of variables in MATLAB

I am trying to create a graph of a velocity against my output variables from the set of matrices shown below on ... the produced outputs as variables that can then be plotted....

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

674 views

1 answer

linear programming - How can I change the output of the lp_solver on Linux to show large numbers instead of scientific notation?

I'm working with the lp_solver on ubuntu on some examples. Most of them are based on big prodution problems. Every ... simplicity to write entries and install. Thanks, Best, J....

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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