Iteration in DrScheme

Okay, so I'm writing some shit in DrScheme (http://www.plt-scheme.org/, basically it's a derivative of LISP) and I'm trying to figure out how the fuck I should go about implementing iteration. I wrote some quite decent code using for loops to avoid the complicated recursion hell that LISP tends to subject you to but now that I go to run it, it keeps throwing up this error:

reference to undefined identifier: for

Basically, wtf is this shit? PLT Scheme guide section 11 is pretty clear that things like
(for ([i '(1 2 3)])
      (display i))
are perfectly valid scheme. Am I missing something painfully obvious, or is something really fucked up going on?

>>1
Read SICP.

Scheme, now you have 2 problems.

>>2

Yes, I know you can recite /prog/ memes. Can you give useful answers instead?

Oh, and to illustrate why I'm finding this so frustrating, that code which I posted, which the manual says works? Yeah, well if you copy and paste it into the scheme terminal then it still tells you for is an undefined identifier. I feel like there must be an import I'm missing or something, but I can't see anything in the manual page about requiring an import. And actually the idea of having to import a module in order to implement recursion just seems fucking ridiculous.

So yeah, anyone familiar with Scheme or LISP want to help? I don't want to have to write the (for (ident list) (procedure)) function by hand...

>>4
No really, read SICP.

It's funny, because, here, reading SICP, is not just a meme, but a valid advice. I'm serious, OP, read SICP, chapters 4 and 5.

We tell people to read SICP because it contains the fucking answers. If everybody read SICP, /prog/ would be much quieter because everybody would already know the answers to their stupid questions.

SICP - The New Bible.

We tell people to read Bible because it contains the fucking answers. If everybody read Bible, /prog/ would be much quieter because everybody would already know the answers to their stupid questions.

Speaking of memes, hax my anux *grabs dick*.

>>4
To the best of my knowledge, scheme doesn't have a for loop. Usually, you implement iteration through recursion. If you had read even a small amount of the wizard book you would know that.

I think however you're looking for for-each i.e.

(for-each display (list 1 2 3))

SICP is good and all, but this really strikes me as a situation where either the compiler is not working or I need an import that isn't clearly specified in the manual. And since I have four assignments two tests and a group presentation this week, I really don't have time to read through SICP again for an answer that I doubt is even in there.

I'm mainly asking because I want to know if there is something completely outside of simple programming that is causing the failure like "scheme version 4.14 has a broken implementation of iteration" or some shit like that. I'm pretty certain my for loops are well designed, and I know for sure that the for loops I'm copying straight from the manual into the terminal are well designed but in both cases it's telling me that a simple library call is an undefined identifier.

Bible is good and all, but this really strikes me as a situation where either the compiler is not working or I need an import that isn't clearly specified in the manual. And since I have four assignments two tests and a group presentation this week, I really don't have time to read through Bible again for an answer that I doubt is even in there.

>>13
That post was bad and you should feel bad.

>>11

Thanks for being helpful. And yeah, I know that usually you implement iteration through recursion in scheme, I just got lazy because of time pressures and recursion having a tendency to do my head in if I spend too long working with it. About half my code is properly done with recursion, but after spending all day coding this shit I kinda got fed up with the headaches.

Also, the page I'm referring to for the for loop is here:
http://docs.plt-scheme.org/guide/for.html

I was thinking about using for-each, but I was having trouble figuring out the syntax for it. But yeah, that example you gave is very helpful.

>>14
That post was sinful and you should repent.

Why don't you read chapter 1 of the guide ( http://docs.plt-scheme.org/guide/intro.html ) before going to chapter 11.

(map (lambda (x) [yourshit]) '(0 1 2 3 4))
How difficult is that.

20 Name: Anonymous 2013-08-31 22:09

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