call a MATLAB function in GAMS - matlab

Is it possible to use a function
of MATLAB in GAMS code.
I have a matrix in my GAMS cod , and I need to have inverse and determinant of matrix , is it possible to call a Determinant function of Matlab in GAMS ? If it's possible How?

Calling GAMS with MATLAB is made possible with the data exchange tools between GAMS and MATLAB called GDXMRW. You can learn more about the process of Data Transfer from the link below.
https://www.gams.com/latest/docs/T_GDXMRW.html

Related

Simbiology toolbox and fmincon in MATLAB

Is is possible to use the model simulated in the Simbiology toolbox of Matlab
to be used to implement fmincon for the same by calling the model from Simbiology?
It is possible to simulate the SimBiology model from a MATLAB script or the command line (see sbiosimulate). This allows the simulation results to be used by any other MATLAB function as needed. I assume that in your case you want to use the simulation results to construct an objective function to use with fmincon and it is possible. Let me know if you need more details.
The short answer is probably, yes. If you have access to the tools and try this, let me know and we can help further.

What algorithm does MATLAB use to find eigenvectors?

So I am using MATLAB for a project and am discussing the use of the power method for finding stationary distributions of Markov chains and its convergence rate. I was wondering what method/algorithms MATLAB's eig() function uses to find the eigenvectors of a matrix?
Normally Matlab is using LAPACK routines to do calculation. With that in mind I guess that from here you will be able to find the code that matlab runs. Be Aware LAPACK is in Fortran.
MATLAB Incorporates LAPACK

Is 'ols' function in Econometrics toolbox in MATLAB?

I am trying to run a code which calls the function OLS. reg=ols(y,X). I am getting an error saying that ols is an undefined function for input of type double. Is ols a function in the econometrics toolbox or do we create a separate ols function? I have checked the working directory and the toolbox is added to the path. I don't know what the problem is.
I don't have ols either and I have the econometrics toolbox. I'm guessing you are looking for some functions in File Exchange, most likely the Toolkit on Econometrics and Economics Teaching.

How to generate a curve using matlab simulink

How to generate the curve of transfer function:
G0(s)=exp(-s)*[(2s+4)/(s^3+5s^2+6s+4)]
using MATLAB and Simulink?
What kind of curve do you mean? Bode plot? Nyquist plot? Step response?
Use the tf function to create your transfer function with the InputDelay parameter to represent the exp(-s), see Models with Time Delays in the documentation for more details.
Once you have your transfer function, you can use functions like bode, nyquist, step, impulse, etc... to generate your "curve" of choice.
All of this requires the Control System Toolbox.

Lapack SPPTRF available?

do you know if MATLAB supports the LAPACK spptrf function.
This function is quite a bargain when you gotta compute Cholesky factorization of a huge positive definite symmetric matrix.
It allows for the factorization by only giving the upper triangular matrix, stored as uni-dimensional matrix, as input.
Or, else, is chol built-in function already using spptrf internally?
EDIT
I have been able to find the lapack library on the File Exchange http://www.mathworks.com/matlabcentral/fileexchange/16777-lapack, with the desired implementation of the spptrf function.
EDIT 2
MATLAB running on my machine is fatally crashing each time I call spptrf.
Is there any alternative way to directly handle this function?