search for: eigenfunctions

...591748/problem.jpg problem.jpg where q(t) is a known function. Note here the lambda parameter is changing, so essentially we have a series of ODEs. lambda is called an eigenvalue, the solution y is called an eigenfunction associated with lambda. The question is to find the eigenvalues lambda and eigenfunctions y. In matlab, this can be done. I am wondering if R has similar functions to achieve this goal. Any suggestions will be highly appreciated. Best regards, Jeff -- View this message in context: http://r.789695.n4.nabble.com/How-to-find-eigenfunctions-and-eigenvalues-of-a-fourth-order-ODE-tp45917...

...need to use option of row weights (I am using CCA following the selection of the significant/positive PCNM variables). In the library PCNM (PCNM function), the Moran's I is calculated for you as part of the function. I see that I need to calculate Moran's I separately in order to retain the eigenfunctions with positive spatial correlation but could use help in doing so...I have looked up Moran's I in a couple different packages but am not sure what to use... Thanks! [[alternative HTML version deleted]]

...s a covariate) into this I have been trying the command - ABUNDTMRT <- mvpart(abundance ~ environ + spatial, data.frame,margin=0.08,cp=0,xv="1se",xval=nrow(abundance),xvmult=100,which=4) where abundance is as above, environ is the environmental factors (from above) and spatial is the eigenfunctions from a PCNM analysis. data.frame is the environ and spatial factors as a data.frame. This gives the error - "Error in `[[<-.data.frame`(`*tmp*`, preds, value = c(72L, 72L, 80L, 72L, : replacement has 504 rows, data has 168" As I am new to this, I am not sure if I am entering an i...

I would like to fit a logistic regression using a smothing spline, where the spline is a piecewise cubic polynomial. Is the knots option used to define the subintervals for each piece of the cubic spline? If yes and there are k knots, then why does the coefficients field in the returned object from gam only list k coefficients? Shouldn't there be 4k -4 coefficients? Sincerely, Bill

I'm trying to do AEM eigenfunctions, but I have a different number of points into each reservoir (e.g.: reservoir 1-4 points, reservoir 2-6 points, reservoir 3-2 points....). Can someone help me?Besides this in the Legendre's book exemple in the part:>length.edge<-vector(length=nrow(edges.b))>for (i in 1:nrow(edges.b)){l...

In the future could you please do some sort of visualization of your data, or at least provide the raw data in a machine-readable format so that others can do so? It is incredibly easy to come to incorrect conclusions when looking at lists of numbers because at any given moment you have a very localized view of the dataset and are prone to locally pattern-match and form a selection bias that