[Cs254f11] bring your programming questions

[Wm. Josiah Erikson]

I have a question ahead of time that might be helpful for others as 
well. Or it could be just silly.

I now have working code that generates and evaluates stuff. Yay! But I'm 
not happy with the style of some of the coding, so I'd like to improve it.

First, I want to be able to take a function, func_a ([arg a] [arg b]) , 
and call it as many times as there are elements in col_a, with two 
arguments (because func_a takes two arguments) of each of col_a's 
elements and also the same second argument each time.

So like map, except with a second argument that stays the same each 
time. I could just make a collection of the same element that is as long 
as col_a, I suppose, but that seems silly. Is there a better way?

(defn func_a
    "This function does nothing useful really"
    [arg_a arg_b]
    (+ arg_a arg_b))

(def col_a '(12 24 15 39 12 56))

(def argument_b 3)

(map func_a col_a argument_b)

Obviously, that will only call func_a once, since argument_b is a 
collection that is only 1 long.  But I'd like it to call it 6 times, 
each time with the same second argument, argument_b. Make sense?

Right now, I'm getting around this by having func_a just refer directly 
to the data it needs for the second argument instead of actually having 
a second argument, and just doing:

(map func_a col_a)

But I don't like that. I could also do something like

    -Josiah



Lee Spector wrote:
> I think that the best use for the post show&tell time tomorrow will be for me to do live programming in response to questions/problems/etc that have come up in your work. So think of things between now and then that have been roadblocks for you, or that you can't imagine how to start doing, or just things you don't get, etc., and we'll try to cover as much of that as possible.
>
> Remember that the general schedule is that there's show&tell on what you've been up to so far tomorrow (Oct 5) and then there's a week-long gap because of October break. On the Wed that we return (Oct 12) there will again be show&tell and that one should focus on a fairly well-thought-out description of what you intend to do for your final project. By the end of class on Oct 12 I want each of you to have received detailed comments (from me and each other) on your project idea and to be ready to work on it full steam ahead. Once we enter that phase of the course I will mix in lectures on specific issues, approaches, and advanced techniques in GP. 
>
>  -Lee
>
> --
> Lee Spector, Professor of Computer Science
> Cognitive Science, Hampshire College
> 893 West Street, Amherst, MA 01002-3359
> lspector at hampshire.edu, http://hampshire.edu/lspector/
> Phone: 413-559-5352, Fax: 413-559-5438
>
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> Cs254f11 mailing list
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>   

-- 
-----
Wm. Josiah Erikson
Network Engineer
Hampshire College
Amherst, MA 01002