Introduction to ChIPper

Welcome back to Chipper. This website makes available the latest version of Chipper. We hope you find it useful. Please send me feedback, especially if you notice problems with the site.

Now, you may upload your data below.

How many chips do you want to analyze?
How many duplicates on each chip?

Help/FAQ/What's new with ChIPper?
Download the source code that implements the Chipper method. It's written in the R programming language.

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<type 'exceptions.IOError'>
Python 2.7.5: /usr/bin/python
Mon Apr 12 15:01:24 2021

A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.

 /srv/www/ in ()
    920     if run_all_tests: run_tests=1
    921     if not run_tests:
=>  922         main()
    923     else:
    924         import unittest
main = <function main>
 /srv/www/ in main()
    910         Actions['Start over'](form, state, session_key)
    911     footer()
=>  912     save_state(form, state, session_key)
    913     if debug: stderr.write("Time to process entire request: %.2fs\n" %
    914                            (time() - t))
global save_state = <function save_state>, form = FieldStorage(None, None, [MiniFieldStorage('id', '308824')]), state = {}, session_key = '308824'
 /srv/www/ in save_state(form=FieldStorage(None, None, [MiniFieldStorage('id', '308824')]), state={}, session_key='308824')
    273     if (valid(session_key)):
    274         session_file = os.path.join(STATE_DIR, session_key)
=>  275         f = open(session_file, "w")
    276         if debug: print "<br>Opened %s<br>" % session_file
    277         if not f:
f undefined, builtin open = <built-in function open>, session_file = '/www/'

<type 'exceptions.IOError'>: [Errno 2] No such file or directory: '/www/'
      args = (2, 'No such file or directory')
      errno = 2
      filename = '/www/'
      message = ''
      strerror = 'No such file or directory'