Is there a method/criteria to determine if changing the value of an element in a square matrix, increases/decreases its condition number?

More Liviu Octavian Mafteiu-Scai's questions See All

How the tutor will develop the best relationships with the students?

Is that relevant to believe the tutors in our student engagement has tremendous responsibility that to make sure every single stage and session will be understood ? How those practices tutors...

24 February 2024 6,916 0 View

Anyone doing research on lower courts (county, municipal, etc.) in other fields than criminal law? .

I am mainly interested in the impact of neoliberal inspired ‘reforms’ (substantive law & civil procedure changes, but also changes on organizational rules) on the behaviour of the judges of...

13 May 2017 9,612 2 View

Can anyone indicate some references about the applications of driftless control affine systems in economy?

13 October 2016 9,941 2 View

Does anyone have any tips for differentiating P19 cells into cardiomyocytes using DMSO and suspended cell aggregate formation?

This is a general outline of the procedure we've used: 1. Suspended 600,000 cells in 6 mL of alpha-MEM supplemented with ~1% DMSO, 10%FBS, and 1% Pen/Strp (antiobiotic). 2. Cultured them for 4...

09 July 2015 6,260 3 View

Is there anyway to stain for intracellular cardiomyocyte markers (like cardiac troponin) without fixing or permeabilizing the cell monolayer?

I understand some nonpolar dyes like Draq5 are able to travel through the cell membrane and into the nucleus. Are there any such dyes that stain for any of your stereotypical cardiac markers like...

14 May 2015 5,396 1 View

Could you share with me the articles of civil codes dealing with restitution matters, valid in 1990 in your country?

I am interested mostly in Central Eastern Europe (Poland, Hungary, former Czechoslovakia) and in Baltic States (in 1992); an English translation and an indication of the the article number of the...

24 September 2014 9,960 3 View

Are you aware of any classification of the quality of law book publishers (in English) and also of Law Journals in English?

References to Journal Articles where such classifications are provided will be appreciated.

23 April 2014 5,618 3 View

Aesthetics, CAD CAM and Zirconia?

Everyone talks about aesthetics, CAD CAM and Zirconia today... and the following questions remained unanswered: 1. Marginal fit of 20-30 microns with gold versus 50-80 with CAD CAM? 2. Ductility...

06 February 2014 2,525 2 View

What is the specificity of the EU’s monetary approach ?

The EU’s monetary approach is specific and complex equally in the historical sense of including the previous ‘monetary snake’ (1971-1979) and (especially) ‘European Monetary System’ (EMS...

04 November 2013 2,211 10 View

Which theory of money is more acceptable: the representative or fiat?

Are the two concepts mutually exclusive?

29 June 2013 6,566 2 View

How to learn more about SPSS and its Application?

I would like to learn more about SPSS and Its application especially in regards to data analysis. Please suggest me how I can learn more about it. Thank you so much.

11 August 2024 9,101 4 View

Can I base on reverse DNA sequences to perform alignment, convert to amino acids and GenBank submission?

I have reverse sequences (AB1 format), can I base on reverse DNA sequences to perform nucleotide alignment, convert nucleotides to amino acids and deposit the sequence in GenBank database?

11 August 2024 5,138 1 View

Baseline drift in HPLC? What causes this?

Hello, Why do i see this baseline drift when i compare my blank (black) to the sample (blue)? Any suggestions as to why this happened? Thank you!

11 August 2024 3,770 4 View

Text-Communication from the M1 Hand Area using BCI—and then there is Elon Musk?

Willett, Shenoy et al. (2021) have developed a brain computer interface (BCI) that used neural signal collected from the hand area of the motor cortex (area M1) of a paralyzed patient. The...

10 August 2024 7,180 0 View

Has anyone applied Python in the field of textile engineering for data analysis, automation, or smart textiles?

I'm currently exploring the application of Python in textile engineering, specifically in areas like data analysis, process automation, and the development of smart textiles. I'm interested in...

10 August 2024 7,429 2 View

How can I use the cif data obtained from rietveld refinement extracted via gsas2, for microstructural analysis using ETEX software?

09 August 2024 7,718 0 View

How can I apply boundary conditions in an orthotropic steel deck numerical model using ABAQUS software?

I am trying to simulate vehicular loading on an orthotopic steel deck bridge section in ABAQUS software. The red arrow mark in the attached figure indicates the direction in which the vehicle will...

08 August 2024 719 0 View

How are iso-frequency contours plotted?

Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...

07 August 2024 1,937 1 View

How to prepare the nanoparticle treated fungal sample for Environmental SEM analysis?

A fungal strain was treated with nanoparticles. We want to do an environmental SEM analysis. So could anyone share your views on preparing the sample? Thank you.

07 August 2024 5,307 1 View

How to normalize and take the significance of the MTT OD values with 3 replicates for the same cell-line?

Hi, I have a question about normalizing the MTT OD values for doing the statistical analysis. So, if we have 3 different plates and we call them 3 different replicates, so, first we would...

07 August 2024 8,106 4 View

Nicolas Guarin-Zapata

I am not sure.. but have you looked to Section 2.2 in Applied Numerical Linear Algebra by Demmel? [1]

I think that you can get something like

kb >= d*ka* norm(B)/norm(A)

where A is the original matrix, B is the perturbed one, ka is the condition number of the original matrix A, kb is the condition number of B and d is a positive constant.

[1] Demmel, James W. Applied numerical linear algebra. Siam, 1997.

Liviu Octavian Mafteiu-Scai

Thanks a lot. I'll look for the recommended book