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...to add hdd=ide-scsi to the end of the following line on /boot/grub/menu.lst , which looks like this: kernel /boot/vmlinuz-2.6.10-5-k7 root=/dev/hdb1 ro quiet splash my DVD is on /dev/scd0 so my kernel line looks like this now: kernel /boot/vmlinuz-2.6.24-27-generic root=UUID=731ba5fc-4fac-480a-b654-5ff6e691b961 ro quiet splash scd0=ide-scsi I also added ide-scsi to the list /etc/modules It didn't work, the decrypter says the device is not detected. can you help me here please?

Hi, I discovered a weird behavior when using a "belongs_to: record" association in Rails 4. Given two models A and B: class A < ActiveRecord::Base belongs_to :record, class_name: ''B'', foreign_key: ''b_id'' end class B < ActiveRecord::Base end When creating A, it inserts a record in B and returns A with id of nil: irb(main):001:0>

A few days ago, I tried to change the optimization flag from -O0 to -O2 to speed up the execution of the application on Ubuntu/ARM 14.04 32 bit. When I compiled the source code with -O2 flag instead of -O0 flag, I could not run the application normally by getting always the segmentation fault. Here is debugging information with GDB command in case of that. As you can see, we could not execute

I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",