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Hello, In the past I have used Excel for creating standard curves. I recently switched to R using the lm function to create my curves instead, but find the results are slightly different even though my y-intercept and slope are the same. A friend told me that the difference was due to R and Excel using a different algorithm to calculate the line. Has anyone run into this problem before? Thank

Hello Rails, I have a problem. I would like to use captcha in one of my project. When I did try to install, this is what I got $ sudo gem install captcha Building native extensions. This could take a while... ERROR: Error installing captcha: ERROR: Failed to build gem native extension. /usr/bin/ruby1.8 extconf.rb extconf.rb:1:in `require'': no such file to load -- mkmf (LoadError)

Hello all, I developed an app using Rails 3.1 and uploaded it to heroku. When I typed rake db:migrate , I got the following error: Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. Does heroku support Rails 3.1? They seem to have no Javascript runtime env''s like nodejs on their machine! -- You received this message

Rails, I have problem. I am validating fields of a class, if validation fails i use the method error.add "Say something" , but when I test my form by giving a invalid entry, I get error output as "Say something is invalid" and not as "Say something". I really dont know where from this "is invalid" pops in. Any help? Thanks in advance Karthikeyan A K --

Hello Rails people. I tried to push a Rails 3.1 app ( created using cedar stack) to Heroku and I encountered the following error Installing sqlite3 (1.3.4) with native extensions Unfortunately, a fatal error has occurred. Please report this error to the Bundler issue tracker at https://github.com/carlhuda/bundler/issues so that we can fix it. Thanks!