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7 results for “from:Mads Jeppe Tarp-Johansen”

solving cubic/quartic equations non-iteratively
Mads Jeppe Tarp-Johansen · Jan 5, 2010 · r-help

To R-helpers, R offers the polyroot function for solving mentioned equations iteratively. However, Dr Math and Mathworld (and other places) show in detail how to solve mentioned equations non-iteratively. Do implementations for R that are non-iterative and...

rimage package fftw breaks when freeing memory on openSUSE 11.3
Mads Jeppe Tarp-Johansen · Feb 9, 2011 · r-help

Turned out to be a matter of having consistent header and dynamiclibrary files - thus did # rm /usr/include/fftw.h # ln -s /usr/include/dfftw.h /usr/include/fftw.h # ln -s /usr/lib64/libdfftw.so.2.0.7 /usr...

rq matrix decomposition
Mads Jeppe Tarp-Johansen · Jun 4, 2007 · r-help

I specifically need rq matrix decomposition (and not qr). Looking at netlib site for LAPACK it does provide rq whereas LINPACK not. Looking at companion qr in R I see how in base it wraps with a .Call but I...

fold right - recursive list (vector) operators
Mads Jeppe Tarp-Johansen · Nov 3, 2004 · r-help

The programming language mosml comes with foldr that 'accumulates' a function f over a list [x1,x2,...,xn] with initial value b as follows foldr f b [x1,x2,...,xn] = f(x1,...,f(xn-1,f(xn,b))...) Observe that...

match.call idiom to call other function with same arguments
Mads Jeppe Tarp-Johansen · Nov 20, 2007 · r-help

The R language definition (version 2.5.1, 2007-06-27, p37) outlines an idiom (here perhaps abusively abbreviated) m <- match.call() m[[1]] <- as.name('plot') eval(m, parent.frame() ) A posting (Subject: "Re: [Rd] problems with plot.formula...

reading fifo with read.table hangs
Mads Jeppe Tarp-Johansen · Jan 13, 2010 · r-help

To R-helpers, Running R version 2.10.0 (2009-10-26) Linux ... 2.6.25.20-0.5-default #1 SMP 2009-08-14 01:48:11 +0200 x86_64 x86_64 x86_64 GNU/Linux openSUSE 11.0...

rimage package fftw breaks when freeing memory on openSUSE 11.3
Mads Jeppe Tarp-Johansen · Feb 9, 2011 · r-help

Upon fresh installation of R-patched and rimage on openSUSE 11.3 box, simple fftw on renown lena image cause memory free failure. Quick: Go to the end of this mail and read the error message from R Thoruogh: Find...

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