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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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603 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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686 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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510 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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442 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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639 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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789 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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674 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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515 views

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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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612 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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411 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

696 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

615 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

501 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)

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573 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

520 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

468 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

760 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

672 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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