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Hi all: I have a question about the computation of expression: y = 1+(2x1+2)-3*(5x1-1)+(3x2+3)-2*(x2-1) The result of y is: y = 11-13x1+x2 How can I compute the result of y via R function? Many thanks! My best. [[alternative HTML version deleted]]

How to define bounds for a semi continous variable in lp_solve. Min 5x1 +9x2 +7.15x3 +0.1x4 subject to x1+x2+x3+x4=6.7 x1+x4 <= 6.5 And x3 can be 0 or greater than 3.6 hence x3 is a semi continous variable how to define bounds as well as semicontinous function because using set.semicont and set. bound simantaneously doesn't seem to work.Thanks in advance for...

I am pretty new to R. So this may be an easy question for most of you. ? I would like to calculate the squared distances of a large set (let's say 20000) of vectors (let's say dimension of 5) to a fixed vector. ? Say I have a data frame MY_VECTORS with 20000 rows and 5 columns, and one 5x1 vector y. I would like to efficiently calculate the squared distances?between each of the 20000 vectors in MY_VECTORS and y. ? The squared distance between two vectors x and y can be calculated: distance <- crossprod(x-y) ? Without looping, what is?the efficient code to achieve this? ? Thanks.

...ZFS is the way people go in recent years. suggestions are welcome, just want to upgrade my old 8.0 BETA3 using geom mirror/stripe to a newer approach that would be supported by FreeBSD. I have an external enclosure for 4 SATA disks (port multiplier included) using 4 disks, another port multiplier 5x1 using now 3 disks, and: ahci1@pci0:13:0:0: class=0x010601 card=0x10601b21 chip=0x06121b21 rev=0x01 hdr=0x00 vendor = 'ASMedia Technology Inc.' class = mass storage subclass = SATA with two eSATA to the Port Multipliers. thanks, matheus machine: ACPI Error: A vali...

https://bugs.freedesktop.org/show_bug.cgi?id=110714 Bug ID: 110714 Summary: Xorg crashes randomly because of memory leak Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: critical Priority: medium Component: Driver/nouveau