Question

constructing a time variable in matlab
Dear all, I have a matrix data= [9 30 0 9 30 0 9 30 0 9 30 0 9 30 ...

environ 5 ans il y a | 1 réponse | 0

1

réponse

Question

changing the format of a cell matrix
Dear all, I have this cell matrix 'data', where as you can see below the element for example 8:00:06 is the hour-minute-secon...

environ 5 ans il y a | 1 réponse | 0

1

réponse

A répondu
cubic spline regression and plot
Any help?

environ 5 ans il y a | 0

Question

cubic spline regression and plot
Dear all, I have two variables X and Y. X and Y are both vectors of dimension 8561X1 For example: X=[ 1 1 ...

environ 5 ans il y a | 2 réponses | 0

2

réponses

Question

less than or equal and greater than of equal operations
Dear all, I have this vector DIFF=[ 0 0.0500 -0.0200 0.0100 -0.0400 0 0 ...

plus de 5 ans il y a | 2 réponses | 0

2

réponses

Question

fmincon: Matrix is singular to working precision.
Dear all, I get the following message but the code seems to be working ok In fmincon (line 797) Warning: Matrix i...

environ 6 ans il y a | 1 réponse | 0

0

réponse

Question

maximizing a function with a nonlinear constraint using fmincon
Dear all, I have a function 'fun' which I want to maximize with respect to four unknowns: x(1) x(2) x(3) and x(4) under th...

environ 6 ans il y a | 1 réponse | 0

1

réponse

Question

solving an equation recursively
Dear all, I want to solve the following equation m(t)=a(t)+k*m(t-1); t=2,...T for the entire path m(t), with the...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question

setting up the ''options' in fmincon
Dear all, I want to maximize a function, where the univariate unknown, x, with respect to which the maximization takes place ...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question

Setting up the fminunc function
Dear all I want to maximize a function, where the univariate unknown, x, with respect to which the maximization takes place is b...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question

finding the maximun of a function along with hessian matrix
Dear All, I have the following function f=-1/2*log(2*pi) -.5*(x+a*b) -.5*y./exp((x+a*b) ) -1/2*log(2*pi*c)-0.5*(x-d*(1...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question

solving a nonlinear equation faster
Dear all, I want to solve this equation -0.5+ 0.5*a*exp(-x-b*c) -(x-d)/e=0 where a,b,c,d are known quantities that ch...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question

Solving a nonlinear equation with time-varying parameters
Dear all, I want to solve this nonlinear equation: (a*b*exp(-c*d))*exp(-x)+2*b -2*x-b=0, where in each iteration of the ...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question

Using kronecker product and elementwise multiplication
Dear all, I have the matrix der=[2 5 ;3 4] OMEGA=kron(eye(2),der); Suppose that now I have the 1 by 2 vector y ...

plus de 6 ans il y a | 2 réponses | 0

2

réponses

Question

Inverse wishart parameter estimates
Dear all, For beta distribution and gamma distribution there are the functions betafit and gamfit, respectively. Is there...

presque 7 ans il y a | 1 réponse | 0

0

réponse

Question

Can I find the inverse of a sparse matrix faster?
Dear all, I have the following code T=2000; NN = speye(T) + sparse(2:T,1:(T-1),2*ones(1,T-1),T,T); u = NN\eye(...

environ 7 ans il y a | 2 réponses | 0

2

réponses

Question

How to divide a large sparse matrix
Dear all I have NN = speye(T) + sparse(2:T,1:(T-1),2*ones(1,T-1),T,T); and I want to calculate zz=(NN\( eye...

environ 7 ans il y a | 1 réponse | 0

1

réponse

Question

constructing identifiers for a large panel data
Dear all, I have a panel data of 180 countries covering the period 2000-2010. Here is a sample: list={'Australia' ...

environ 7 ans il y a | 1 réponse | 0

1

réponse

Question

How can we find the non common strings from multiple columns
Dear all, I want to compare the following three columns of strings (of different length) and find the entries that are NOT ...

environ 7 ans il y a | 2 réponses | 0

2

réponses

Question

how to select particular rows from a matrix
Dear all, I have a panel data set(countries, years) of dimension 20000 by 200. My goal is 1) to choose those countries ...

environ 7 ans il y a | 2 réponses | 0

2

réponses

Question

how do we plot a bivariate normal distribution from one side?
Dear all I plot the following bivariate distribution mu = [0 0]; Sigma = [.25 .3; .3 1]; x1 = -3:.2:3; x2 = -3:.2:3; ...

plus de 7 ans il y a | 1 réponse | 0

1

réponse

Question

Where can I run my Matlab code.
Dear all, I conduct some simulation studies but my laptop is not very fast. Could I run this code to a more powerful pc? Doe...

plus de 8 ans il y a | 2 réponses | 0

2

réponses

Question

Generating random draws from a specific poisson distribution
Dear all, I have the following variation of the poisson distribution P(Y=y)=((mean/vbn)^(y))*(nv^(y-1))*(exp(-mean*nv/vb...

plus de 8 ans il y a | 1 réponse | 0

1

réponse

Question

How we generate random variates from a generalized poisson distribution?
Dear all, I want to use generate draws from the "generalized poisson distribution". Is there any function in matlab to do that...

plus de 8 ans il y a | 1 réponse | 0

1

réponse

Question

Find maximum of a function.
Dear all, I have the following code that aims at maximixing LL_all with respect to "gidraw" which is scalar. %the dat...

plus de 8 ans il y a | 1 réponse | 0

1

réponse

Question

inv(A) versus /A. Which of the two is the correct one
Hi all, Let B be a n by 2 matrix and A is a 2 by 2 positive definite matrix. Which of the following two is correct ...

environ 9 ans il y a | 1 réponse | 0

1

réponse

Question

Is it possible to run my matlab code at another workstation?
Dear all, Unfortunately, my personal laptop is not very strong and it takes days to run my Matlab code. Is it possible to run...

plus de 9 ans il y a | 1 réponse | 0

0

réponse

Question

reshaping tables and calculating combination of differences between variables
Hi all, I would like to reshape the following table Area time rates A1 2008 13 A1 2009 12 A2 2008 11 ...

presque 12 ans il y a | 1 réponse | 0

0

réponse

Question

converting a string of variables to numbers
HI all I have the varible Country Austria Austria Austria Austria Austria Austria...

presque 12 ans il y a | 1 réponse | 0

1

réponse

Question

grouping observations with specific characteristics
Hi all, I have the following table in excel time country Location price2 1/09 Austria l1 12 2/09 Austria l1 4 3/09 Au...

presque 12 ans il y a | 1 réponse | 0

1

réponse