Jump to content
  • Advertisement
Sign in to follow this  
Alpha_ProgDes

In lambdas in lambdas.... I don't quite understand.

This topic is 2338 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

This is from SICP Video Lectures, Lecture 2a around the 39:51 mark.

(DEFINE SQRT X
(FIXED-POINT
(AVERAGE-DAMP (LAMBDA Y (/ X Y)))
1))

(DEFINE AVERAGE-DAMP
(LAMBDA f
(LAMBDA x (AVERAGE (f x) x))))



What does the `x` in the second lambda do in AVERAGE-DAMP and how is it being accessed? I don't understand what exactly is being passed to it. Edited by Alpha_ProgDes

Share this post


Link to post
Share on other sites
Advertisement
As far as I can see, AVERAGE-DAMP returns the second lambda to FIXED-POINT, which will feed data to x. The first lambda is just the AVERAGE-DAMP lambda. Hope that makes it a bit clearer!
Btw, the Y in sqrt, where does it come from? Maybe a typo?

Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!