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I have two tables like: Table A: id (autoincrement) name Table B id id_of_A desc I want to add a record to table A and based on the id of A, I want to add a record to table B. I don''t think there is any SQL command that support this (at least in MySQL 4.1, so I use LAST_INSERT_ID()). (Is there any other way? or MySQL 5 support any special SQL command?) But I need

...prevent the attribute from being changed even from inside the class? In other words, will the following method successfully change the values of attribute_a and attribute_b in model A? 1.Class A < ActiveRecord::Base 2. attr_readonly :attribute_a, :attribute_b 3. def change_attributes(new_a, new_b) 4. self.attribute_a = new_a 5. self.attribute_b = new_b 6. save! 7. end 8. end I know I can redefine the write accessor if I want to customize the way a single attribute is changed. However here I would like to change two attributes in one transaction and prevent each attribute from...

...NA > + 4 0 1 > + 4 3 0 > + 5 2 5 > + 5 7 NA", header = TRUE) > > df2 <- df1 %>% > + group_by(ID) %>% > + mutate(new_A = A / sum(A, na.rm = TRUE) > + , new_B = B / sum(B, na.rm = TRUE) > + ) > > > > df2 > Source: local data frame [10 x 5] > Groups: ID [5] > > ID A B new_A new_B > (int) (int) (int) (dbl) (dbl) > 1 1 1 2 1.0000000 0.4 > 2 1 0 3 0.0000000...

Hi I have two data frames as shown below (second one is obtained by aggregating rows of similar IDs in df1.). They both have similar number of columns but rows of df2 are lesser than rows of df1. df1: ID A B 1 1 2 1 0 3 2 5 NA 2 1 3 3 1 4 4 NA NA 4

Hello, I noticed a bug in Xen-4.1-3, which is also still present in xen+git. I know that the Python xend is deprecated, but I''m stuck with xen-4.1 until xen is usable with libvirt, so my patch might still be helpful for others. This is a follow-up to <http://lists.xen.org/archives/html/xen-users/2012-11/msg00069.html>, which still keeps me busy. /xen/xend/server/SrvDomain.py