AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

|
April 01, 2014 08:51PM
In the AFNI user interface, there is only a clumsy way to do this, via the InstaCalc controls.

  1. Open the Define Overlay control panel
  2. In the upper right corner is a drop-down menu with the word "Clusters" -- click on that and switch it to "InstaCalc"
  3. Below will appear a button "Setup ICalc" -- press that button
  4. A biggish control panel will open up to let you calculate a new overlay volume from 1 or more input volumes.
  5. Select row A, then click on its "Choose Dataset" button (leave the "Dataset: Value" button alone), then choose a dataset to be "A". If you want a particular sub-brick (besides #0), use the next item in the row to select the index.
  6. Repeat for row B (you can use the same dataset as A, and pick a different sub-brick index if you like).
  7. Enter a mathematical expression involving variables A and B in the "Expr" text entry field at the top of the form. For example, the expression A+B will add the two datasets together.
  8. Press the "Compute InstaCalc" button.

The real trick is figuring out what mathematical expression you want to use to combine the datasets. Without more information, I can't provide much guidance here.
Subject Author Posted

two functional overlays?

aar175 April 01, 2014 06:28PM

Re: two functional overlays?

Emperor Zhark April 01, 2014 08:51PM

Re: two functional overlays?

ptaylor April 02, 2014 04:55AM

Re: two functional overlays?

Daniel Glen April 02, 2014 01:47PM

Re: two functional overlays?

ptaylor April 02, 2014 02:00PM

Re: two functional overlays?

Emperor Zhark April 15, 2014 09:35PM

Re: two functional overlays?

ptaylor April 16, 2014 06:58AM

Re: two functional overlays?

Emperor Zhark April 16, 2014 09:02AM

Re: two functional overlays?

Peter Molfese April 16, 2014 09:33AM

Re: two functional overlays?

ptaylor April 16, 2014 09:34AM