On Sat, 5 Dec 2020 19:26:30 -0800 (PST), Yi Chen <[email protected]> wrote:
> #lang slideshow > (define cat <some_picture>) > (image-width (cat)) There is no function "image-width" in slideshow. see: https://docs.racket-lang.org/search/index.html?q=image-width To use "image-width" you must require one of these library modules: - htdp/image - 2htdp/image - quadwriter Additionally your syntax is wrong: it should be "(image-width cat)". With the parentheses, "(cat)" is a call of a function named "cat" - however "cat" is not a function but simply an image. Hope this helps, George -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/va2psf5vv4ilbd52ihgrmo8dojoosuglkf%404ax.com.
