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programming,IC615

• SKILL for the Skilled: How to Shuffle a List

The previous post of SKILL for the Skilled presented some ways to systematically visit all permutations of a list. As noted, the time to iterate through all permutations of a large list is prohibitive. If the goal is to find a permutation that meets some criteria then it may work perfectly well to simply...
Posted to Custom IC Design (Weblog) by Team SKILL on Wed, Oct 9 2013
• SKILL for the Skilled: Visiting All Permutations

In this posting I want to look at several ways of generating permutations of a list. The problem comes up occasionally in fault analysis as well as a few other applications. Don't generate the list It is usually a bad idea to try to generate a list of all permutations as the length of that list can...
Posted to Custom IC Design (Weblog) by Team SKILL on Thu, Sep 5 2013
• SKILL for the Skilled: How to Copy a Hash Table

In this posting I want to look at ways to copy a hash table in SKILL. There are several ways you might naively try to do this, but some of these naive approaches have gotchas which you should be aware of. In the following paragraphs several inferior functions will be presented: portable_1 , copyTable_2...
Posted to Custom IC Design (Weblog) by Team SKILL on Wed, Aug 28 2013
• SKILL for the Skilled: The Partial Predicate Problem

The partial predicate problem describes the type of problem encountered when a function needs to usually return a computed value, but also may need to return a special value indicating that the computation failed. Specifically, the problem arises if the caller cannot distinguish this special value from...
Posted to Custom IC Design (Weblog) by Team SKILL on Wed, Jun 19 2013
• SKILL for the Skilled: Part 9, Many Ways to Sum a List

In the previous postings of SKILL for the Skilled , we've looked at different ways to sum the elements of a list of numbers. In this posting, we'll look at at least one way to NOT sum a list. In my most recent posting , the particular subject was how to use SKILL++ to define a make_adder function...
Posted to Custom IC Design (Weblog) by Team SKILL on Wed, May 22 2013
• SKILL for the Skilled: Part 8, Many Ways to Sum a List (Closures -- Functions with State)

In the past several postings to this blog, we've looked at various ways to sum a given list of numbers. In this posting I'll present yet another way to do this. This time the technique will be markedly different than the previous ways, and will take advantage of a powerful feature of SKILL++...
Posted to Custom IC Design (Weblog) by Team SKILL on Tue, Apr 23 2013
• SKILL for the Skilled: Part 7, Many Ways to Sum a List

In this episode of SKILL for the Skilled I'll introduce a feature of the let primitive that Scheme programmers will find familiar, but other readers may have never seen before. The feature is called named let , and I'll show you how to use it to sum the numbers in a given list. Named LET There...
Posted to Custom IC Design (Weblog) by Team SKILL on Mon, Mar 25 2013
• SKILL for the Skilled: Part 6, Many Ways to Sum a List

In a previous post I presented sumlist_2b as a function that would sum lists of length 0, 1, or more. (defun sumlist_2b (numbers) (apply plus 0 0 numbers)) Unfortunately sumlist_2b cannot handle extremely long lists. In this posting, I will introduce sumlist_6 which does not suffer from this limitation...
Posted to Custom IC Design (Weblog) by Team SKILL on Thu, Jan 10 2013
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