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Im learning racket and I was wondering why when defining a constant you get this error: name is not defined, not a parameter, and not a primitive name 12:29 jonrafkind: how did you define it 12:30 jnudie: (define mean (/(+ x y z) 3)) 12:30 jnudie: suppose to find the arithmetic mean 12:30 offby1: have you defined x, y, and z already? 12:31 jonrafkind: are you in drracket? 12:31 jnudie: no, havent defined those variables 12:31 jnudie: Yes, in drracket right now 12:31 jonrafkind: do you want `mean' to be a function? 12:32 jnudie: no, i just want it to be a constant 12:32 jonrafkind: ok then you probably just need to define x, y, z first. then it should work 12:32 jnudie: ah, alright. My prof said it might not work but i was curious as to why 12:32 jnudie: thanks for the help :) 12:33 (quit) anRch: Quit: anRch 12:38 (quit) jonrafkind: Read error: Connection reset by peer 12:39 (join) jonrafkind 12:41 (join) sstrickl 12:49 (quit) jnudie: Quit: Lost terminal 12:57 (join) Claudio 12:57 (nick) Claudio -> Guest39551 12:57 (nick) Guest39551 -> claudio_rdgz 12:58 claudio_rdgz: hi guys, does anyone know where can I find a list explaining the erros prompted by drracket? 12:58 claudio_rdgz: i am still learning the basics 12:58 jay-mccarthy: for example? 12:59 claudio_rdgz: derivation-parser: error on token #940: > 12:59 jay-mccarthy: what kind of program are you writing? 12:59 jonrafkind: ive never seen that before.. 12:59 jay-mccarthy: jonrafkind: is it from parser-tools? 13:00 jonrafkind: that would be my first guess 13:00 claudio_rdgz: i am learning agents, so this is an agent that gets to a certain city 13:00 jay-mccarthy: what library are you using for these agents? 13:00 claudio_rdgz: it is really basic, i think it is that is lacking some code (definitions) because this is the code that the teacher gave us 13:00 claudio_rdgz: library? 13:01 jay-mccarthy: that error is not from racket 13:01 jay-mccarthy: it is from the env that your teacher gave you 13:01 jonrafkind: heh, trying to determine exactly what setup a user has is getting quite complicated in racket these days :p 13:01 jay-mccarthy: if you can help us figure out what that is, we could direct you better 13:02 claudio_rdgz: mmm, i'm using R5RS, and it is version 5.0.1 13:02 claudio_rdgz: yes the program lacks something 13:02 claudio_rdgz: i am trying to pinpoint what though 13:05 (join) hanDerPeder 13:06 claudio_rdgz: oooooo 13:06 claudio_rdgz: A parser is a component of an application that processes text to extract information. 13:06 claudio_rdgz: there are a few definitions not included in the program! 13:06 claudio_rdgz: :D 13:07 claudio_rdgz: thanks guys 13:09 (join) anRch 13:22 (quit) hanDerPeder: Quit: hanDerPeder 13:45 (join) mceier 13:51 vu3rdd: Is there anyway to configure Racket so that redefinition of a variable can shadow the previous definition? Currently, it says "duplicate definition for identifier" 13:52 jonrafkind: you dont usually want to do that in a module, but at the top-level thats ok 13:52 vu3rdd: ok 13:53 jonrafkind: actually just put '#lang racket/load' at the top of your file if you want that behavior 13:53 vu3rdd: ok.. thanks 13:53 jonrafkind: if you turn your program into a reusable library then make sure you change it back to #lang racket 13:59 vu3rdd: jonrafkind: thanks a lot. 14:35 (join) carleastlund 14:50 (quit) vu3rdd: Remote host closed the connection 15:15 (quit) anRch: Quit: anRch 15:21 (join) Madars 15:22 Madars: Hi! I don't know if this is the right place for a sicp.plt support, but I'll give it a shot: why does http://planet.plt-scheme.org/trac/ticket/217 occur and how can one fix it? The picture language is pretty much unusuable with this bug present 15:36 (quit) Madars: Quit: changing buildings 16:00 (quit) b-man_: *.net *.split 16:00 (quit) emma: *.net *.split 16:00 (quit) rotty: *.net *.split 16:00 (join) rotty 16:01 (join) emma 16:01 (join) b-man_ 16:07 (join) hanDerPeder 17:02 (join) axiom 17:06 (join) Madars 17:09 axiom: What's the best way for handling user authentication? Do people generally just roll their own salted hashing with cookies? 17:14 (quit) dzhus: Read error: Operation timed out 17:17 (join) Fare 17:19 (join) Madars- 17:20 (quit) Madars: Ping timeout: 265 seconds 17:33 (join) adlaius 17:36 (join) jao 17:38 jonrafkind: in redex I want to write a term that expands into another term, and I dont want the evaluator to deal with it. how do I write a macro in redex? 17:39 jonrafkind: like I want (term (+ 1 (my-foo))) to expand to (term (+ 1 (+ 2 3))), if (my-foo) became (+ 2 3) 17:40 jonrafkind: clklein, ping 17:48 jonrafkind: I guess I could do a local-expand on the code before i pass it off to (term) 17:49 jonrafkind: (my-term stuff) => (let ([expanded (expand stuff]) (term ,expanded)) 17:56 jonrafkind: hm well maybe i can just use metafunctions 17:56 jay-mccarthy: a metafunction does that 18:13 jonrafkind: ok it worked great 18:42 (quit) carleastlund: Quit: carleastlund 18:43 (quit) sstrickl: Quit: sstrickl 18:55 (quit) axiom: Ping timeout: 252 seconds 19:10 (nick) mceier -> noodly 19:11 (quit) noodly: Quit: leaving 19:11 (join) mceier 19:23 (quit) mceier: Quit: leaving 19:23 (join) mceier 19:24 (quit) hanDerPeder: Quit: hanDerPeder 19:49 (quit) mceier: Quit: leaving 19:49 (quit) jonrafkind: Ping timeout: 276 seconds 19:56 (quit) masm: Quit: Leaving. 20:33 (join) axiom 20:50 (quit) axiom: Quit: Page closed 20:51 (join) jtdelosh 21:17 (quit) Fare: Quit: Leaving 21:45 (quit) b-man_: Ping timeout: 240 seconds 22:51 (join) rbarraud 22:51 (quit) rbarraud__: Ping timeout: 264 seconds 23:38 (join) jonrafkind