How would you call the following matrix shape?

The m x n matrix A has the property (j < i < m - j + 1) \vee (n - j + 1 < i < m - n + j) \implies a_{i,j}=0 How would you name a matrix that has this property ? I call it "double-cone matrix"....

04 May 2014 2,374 3 View

What is the best Machine Learning book I can use for implementing text classification?

I am trying to implement a machine learning algorithm that classifies some situations using text messages in log files and in database tables which reside on multiple servers. These messages are...

03 April 2014 7,697 6 View

Can we simulate a Universal Turing Machine using the game of Go?

Go (the surrounding game) is over 4000 year old strategy game between two players. It is played with Black and White tokens (called stones) on a square board with intersections drawn. The goal of...

07 August 2013 1,019 8 View

Methods for solving a particular non-linear system ?

Consider solving the following system for unknowns A1, A2, B, D, G: w = 2 B^2 + D^2; z = A1 B + A2 B + G D; y = 2 A1 A2 + G^2; x = A1^2 + A2^2 + G^2; a2 A1 + a2 A2 + a G = x2 B + x4 B + x3...

31 December 2012 5,487 10 View

Proof that Harmonic numbers Hn = 1+1/2+1/3+...+1/n can not be calculated in constant number of arithmetic operations ?

Consider the basic arithmetical operations of addition, subtraction, multiplication and division. Can the sum H_n = 1+1/2+1/3+..+1/n be expressed in number of these basic operations that does...

07 August 2012 6,512 11 View

Are there any applications of Computable Analysis?

Can you suggest some (real-life) applications of Computable Analysis? http://en.wikipedia.org/wiki/Computable_analysis Why don't we just use classical analysis?

06 July 2012 2,408 4 View

What are more recent advances regarding P versus NP question?

31 December 2011 6,392 16 View

Problem of measuring software entropy (software rot)

What are more recent methods and publications for this ? http://en.wikipedia.org/wiki/Software_rot

31 December 2011 5,029 1 View

Isometries of the Hilbert Cube

What are the isometries of the Hilbert Cube I^\infty = the set of all sequences (x_i) such that x_i \in [0, 1] endowed with the metric d((x_i), (y_i)) = \sum_{i=0}^\infty 2^{-i} |x_i - y_i| ?

10 November 2011 1,898 4 View

The Algorithmic Principle Behind Curiosity and Creativity

A while back I did a blog post about the problem of automating creativity here: https://www.researchgate.net/post/Can_creativity_be_effectively_automated_a_note_about_P_versus_NP_problem4 This...

09 October 2011 9,531 0 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

How climate change will influences human and animal behavioral change?

The role of climate change influencing the human behavior as well as economics interest

01 June 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View