On Sat, 5 Dec 2020 19:26:30 -0800 (PST), Yi Chen <cy691633...@gmail.com> 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 racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/va2psf5vv4ilbd52ihgrmo8dojoosuglkf%404ax.com.
