CS 145 Lecture 24 – Accumulation
October 30, 2015 by Chris Johnson. Filed under
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cs145, fall 2015, lectures.
Agenda
- what ?s
- accumulation pattern
Note
We continue our discussion of common patterns we see with loops. Today we visit the accumulation pattern, where a loop iterates through a collection and accumulates values in some variable of larger scope. Accumulations tend to look like this:
initialize soFar
for each item
integrate item into soFar
end
use soFar to some other end
We’ll look at an example of calculating a linear approximation of a dataset.
Code
Regression.java
/usr/lib/ruby/vendor_ruby/rubygems/dependency.rb:315:in `to_specs': Could not find 'coderay' (>= 0) among 94 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/var/www/.local/share/gem/ruby/3.2.0:/var/lib/gems/3.2.0:/usr/local/lib/ruby/gems/3.2.0:/usr/lib/ruby/gems/3.2.0:/usr/lib/x86_64-linux-gnu/ruby/gems/3.2.0:/usr/share/rubygems-integration/3.2.0:/usr/share/rubygems-integration/all:/usr/lib/x86_64-linux-gnu/rubygems-integration/3.2.0:/home/johnch/.gems' , execute `gem env` for more information
from /usr/lib/ruby/vendor_ruby/rubygems/dependency.rb:327:in `to_spec'
from /usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_gem.rb:57:in `gem'
from ./coderay:24:in `'
Haiku
To accumulate:
while the bag is not empty
eat you some candy