Is it possible to have repeated eigenvalues and linearly independent eigenvectors corresponding to the repeated values?

07 August 2016 7,791 12 View

What is the difference between the autocorrelation of a stationary signal and non-stationary signal?

If one takes the autocorrelation of a stationary signal, and then that of a non-stationary signal, then would it be possible to say which one is stationary from the ACFs?

31 December 2014 9,609 5 View

What is the geometrical interpretation of multiplying a matrix by the inverse of another matrix?

What happens geometrically when one multiplies a matrix A by the inverse of a matrix B?

31 December 2014 5,200 5 View

What is the advantage of multivariate change point detection over univariate change point detection?

In a multivariate time series, what extra information does performing multivariate change point detection provide than performing univariate change point detection of individual time series? Both...

11 December 2014 5,439 3 View

How should I handle zero R2 values?

Consider a time series (stationary or non-stationary). I fit a linear model of order 0, i.e., an intercept to the data. In the stationary case, this corresponds to the mean. Now, when I calculate...

10 November 2014 7,015 13 View

How can one identify a wrong parameter in a state space model?

I have a state space model - linear or non-linear. I know that there is (are) wrong parameter(s) in the model (the model structure is correct though). Is there a method to isolate the wrong...

09 October 2014 2,513 6 View

What is the discrete equivalent of complex conjugate poles on imaginary axis for continuous case?

If there are complex conjugate poles on the imaginary axis (+jw and -jw) for a continuous system, what would be the location of the poles of the equivalent discrete time system?

08 September 2014 4,124 5 View

What measures exist for characterising and classifying segments of data acquired over a period of time?

I have measurements from a system over a long period of time. During this time, the system has been in different states (for example, different controller tuning configurations). Now, looking at...

07 August 2014 3,337 7 View

Performance of EKF changes with noise in MATLAB?

When I change the seed of random noise generation in MATLAB, keeping everything else fixed, the performance of the EKF and also UKF (MSE, ACF of the estimation errors, etc.) changes every time....

01 February 2014 1,604 16 View

What is the effect of DC on fft in MATLAB?

What would be the effect of a dc component on the fft of a signal with time varying frequency content?

01 February 2014 4,364 3 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

Binary Logistic Generalized Linear Mixed model in SPSS. Is it doable?

I want to analyses the proportion of swimming sperm of three species of fish in two salinities. To analyse the proportion of swimming sperm in a Generalized Linear Model, I would use a Binary...

03 March 2021 2,297 3 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 View

Why the results when using wall thickness and when using shell conduction are different in ansys fluent?

Actually, I am running cfd simulation for a heat exchanger which has two fluids one hot and other one is cold fluid. there is a solid domain between them, which I removed and instead I have used...

01 March 2021 9,537 2 View