[racket] confused beginner

Ok, I'm stuck again:
I'm trying to use place-image, but it keeps saying
place-images: unbound identifier in module in: place-images

It doesn't even seem to work with the example code in the docs found at:
http://docs.racket-lang.org/teachpack/2htdpimage.html?q=overlay#%28def._%28%28lib._2htdp%2Fimage..rkt%29._place-images%29%29

Here's what I think the docs say the code is:
#lang racket
(require 2htdp/universe)
(require 2htdp/image)
(require lang/posn)
(place-images
   (list (circle 4 "solid" "blue")
         (circle 4 "solid" "white")
         (circle 4 "solid" "white")
         (circle 4 "solid" "white"))
   (list (make-posn 18 20)
         (make-posn 0 6)
         (make-posn 14 2)
         (make-posn 8 14))
   (rectangle 24 24 "solid" "goldenrod"))

But like I said, I get the error.  I'm trying to use place-images to place
a bunch of sprite images on a scene for a simple video game.  I'm assuming
place-images the best way to do that.

Thanks in advance for helping me out.  I know it's basic stuff.

On Sat, Oct 4, 2014 at 9:04 AM, Andrew Ulrich <andrewsotheraccount at gmail.com
> wrote:

> Aha, great! Thanks guys!
>
> Andrew
>
> On Sat, Oct 4, 2014 at 8:54 AM, Jens Axel Søgaard <jensaxel at soegaard.net>
> wrote:
>
>> Hi Andrew,
>>
>> To add what Matthias say, if you need a "function version" of bitmap,
>> you can use bitmap/file instead.
>>
>>     (require 2htdp/image)
>>     (define path-stringy "images/some.png")
>>     (bitmap/file path-stringy)
>>
>> Note that I changed (path-stringy) to path-stringy.
>>
>> /Jens Axel
>>
>>
>>
>>
>> 2014-10-04 15:48 GMT+02:00 Matthias Felleisen <matthias at ccs.neu.edu>:
>> >
>> > What you used is called a "computed string" that is, you expect bitmap
>> to evaluate the argument path-stringy to a string.
>> >
>> > But, in BSL, bitmap expects to be handed a literal string constant (or
>> a module path):
>> >
>> > ---------------------------------------------------------------------
>> > (require 2htdp/image)
>> >
>> > ;; with a module path
>> > (bitmap 2htdp/planetcute/character-cat-girl.png)
>> >
>> > ;; with a fixed string
>> > (bitmap
>> "plt/pkgs/htdp-pkgs/htdp-lib/2htdp/planetcute/character-cat-girl.png")
>> > ---------------------------------------------------------------------
>> >
>> > Both of these will succeed and retrieve the cat girl from the Planet
>> Cute collection that comes with Racket -- Matthias
>> >
>> >
>> >
>> >
>> > On Oct 4, 2014, at 9:36 AM, Andrew Ulrich wrote:
>> >
>> >> Hi, I've got a really simple problem, I think.  Why is it that when I
>> try to do the following:
>> >>
>> >> (require 2htdp/image)
>> >> (define path-stringy "images/some.png")
>> >> (bitmap (path-stringy))
>> >>
>> >> I get the following error:
>> >>  bitmap: expected the argument to specify a local path (via a string)
>> or a module path (e.g. `icons/b-run.png') in: (bitmap (path-stringy))
>> >>
>> >> I mean, shouldn't path-stringy evaluate to a string before it's passed
>> into bitmap?  If not, then how do I use bitmap for anything dynamic?
>> >>
>> >> Thanks,
>> >> Andrew
>> >> ____________________
>> >>  Racket Users list:
>> >>  http://lists.racket-lang.org/users
>> >
>> >
>> > ____________________
>> >   Racket Users list:
>> >   http://lists.racket-lang.org/users
>>
>>
>>
>> --
>> --
>> Jens Axel Søgaard
>>
>
>
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