conditional-statements

I am trying to specify two conditions as a part of a for loop. It seems like the second condition in the second for loop is not being considered. My code runs this way: for (i in 1:nrow(mydata)) { for (j in 1:nrow(mydata) && j!=i ) { Statements.... } Statements... } Could you please tell me if this is the right Syntax in R? Thanks! To answer your question, you need: for (i in 1:nrow(mydata)) { for (j in 1:nrow(mydata) ) { if(j != i) { Statements.... } } Statements... } However, there is probably a nicer way achieving what you want to do, but I would need more details. This could do the trick:

This question already has answers here : SQL Conditional AND (4 answers) Closed 5 years ago . I want to determine the JOIN column based on the value of the current row. So for example, my job table has 4 date columns: offer_date, accepted_date, start_date, reported_date. I want to check against an exchange rate based on the date. I know the reported_date is never null, but it's my last resort, so I have a priority order for which to join against the exchange_rate table. I'm not quite sure how to do this with a CASE statement, if that's even the right approach. INNER JOIN exchange_rate c1 ON c1

I have a ranking which shows the fastest User: @users = User.find.sort { |a, b| b.finished_at <=> a.created_at } Now I hat to add some code to prevent getting an error because of finished_at beeing nil until the user finished. @users = User.find(:all, :conditions => "finished_at IS NOT NULL").sort { |a, b| b.finished_at <=> a.created_at } But sort doesn't work. Is this way of chaining methods flawed? And is find(:all, :conditions => "finished_at IS NOT NULL") the rails 3 way or outdated? Thanks in advance DGM The rails 3 way to query this would be: @users = User.where('finished_at IS NOT NULL'

I am handing over dictionary keys (key value pair) to a service which in turn utilizes the api to send the email via Mandrill. Now, if my key is blank then i dont want it to be included in the email. Like in the following scenario, i only want the link text to display if my key has some value. <a href=" |UPDATE_PROFILE| " target="_blank" >change subscription preferences</a> How can i write it some thing like or even is this possible? if *|UPDATE_PROFILE|* IS NOT EMPTY BEGIN <a href="*|UPDATE_PROFILE|*" target="_blank">change subscription preferences</a> END I have found the answer here: http:/

What is the best and DRYest way to write code that can be executed either when some time has passed (say, 5 seconds) or some condition is met (e.g. bool = true ) - whichever comes first . The five seconds start counting from when the script first ran, and the boolean is a global that is changed by another function. I don't think you can combine the time out and the bool-check in one statement, but another good way is also good. Pseudo code: if (bool = true OR timePassed = 5000): runCode() You can set a timeout and cancel it if the function is called before the time limit is reached. var

This question already has answers here : Closed 6 years ago . Possible Duplicate: R: subset() logical-and operator for combining conditions should be & not && I have a simple question, but I don't know how to solve this... I want to select all rows where value_1 > 0 and value_2 > 0. Now I have this code: dataOnBoth<-data[data$value_1 > 0,][data$value_2 > 0,] When I head this data, ordering on log2_fold_change, I have This output: gene_id sample_1 sample_2 status value_1 value_2 log2_fold_change 86 uc001aen.1 q1 q2 NOTEST 0.0619347 0 -1.79769e+308 150 uc001ahx.1 q1 q2 NOTEST 0.0432199 0 -1

I have a dataframe like this: Date PlumeO Distance 2014-08-13 13:48:00 754.447905 5.844577 2014-08-13 13:48:00 754.447905 6.888653 2014-08-13 13:48:00 754.447905 6.938860 2014-08-13 13:48:00 754.447905 6.977284 2014-08-13 13:48:00 754.447905 6.946430 2014-08-13 13:48:00 754.447905 6.345506 2014-08-13 13:48:00 754.447905 6.133567 2014-08-13 13:48:00 754.447905 5.846046 2014-08-13 16:59:00 754.447905 6.345506 2014-08-13 16:59:00 754.447905 6.694847 2014-08-13 16:59:00 754.447905 5.846046 2014-08-13 16:59:00 754.447905 6.977284 2014-08-13 16:59:00 754.447905 6.938860 2014-08-13 16:59:00 754