I recommend using a linter, that shows immediately where the problem is

Thanks, I do not see why it is not using the args from the function

look at your parens, aka, whats in the scope of what

if you arent using a paren-balancer-plugin like parinfer, I do recommend finding one. if you have one you can work similarly to python, where you can largely look at indentation to determine whats in a given scope

Thanks

The provided map has to be a one-to-one mapping. In your example, multiple keys in the input map have the same value. When the map is inverted, it fails the post condition because the inverted map will have less keys as a result of the collision. Specifically, your inverted map will only have 4 keys because there are 4 unique values.

The :post bit is an assertion to be executed after the function runs. This is explained in more detail at <https://clojure.org/reference/special_forms#_fn_name_param_condition_map_expr_2>

also https://clojure.github.io/clojure/clojure.set-api.html#clojure.set/map-invert exists already

thanks for that @U04RG9F8UJZ! I am kinda a newbie with clojure still... and I am a bit confused. The code snippet I pasted is from the actual demo of the library https://github.com/smee/binary/blob/master/src/org/clojars/smee/binary/demo/matlab5.clj. Has anybody else done any binary file parsing using clojure?

yes

you may just want something like https://docs.oracle.com/javase/7/docs/api/java/io/DataInputStream.html

@U022LK3L4JJ in the sample, they do an enum of element-types, not element-type-sizes

thanks @U0NCTKEV8! This looks promising... in order to avoid clojure/java interop... do you know if there is a clojure library for this?

do the interop

@U04RG9F8UJZ aaah yes you are right, let me try that again

@U0NCTKEV8 ok... if I am to do interop... do you know how to set seek in clojure?

or will I use java routines?

newbie remember... apologies for pedantic questions

thanks for your pointers and help both!

https://clojure.org/reference/java_interop explains how to call java methods

https://docs.oracle.com/javase/8/docs/api/java/io/RandomAccessFile.html

thanks @U0NCTKEV8! However is this efficient if the file size is a concerns(in GBs)?

Depends what you are doing, seek is as efficient as it can be, but if your usage pattern involves constantly jumping back and forth across gigabytes you may have issues

Eric Rochester on memory-mapped files: http://www.ericrochester.com/posts/code/parallel-io-with-mmap/index.html

I am interested in implementing machine learning using clojure.

@U065UD4JYSZ

There's a #C054XC5JVDZ channel, just FYI.

Also #C117LBN0K

Ah, I didn't even know about that channel...

Most values in Clojure are "constant", so def would be an easy choice here

unless you're setting up some sort of "dictionary" of mappings of X -> Y, in which case a hash-map might be what you want

for instance, I'm currently making a translator of php-dateformatter characters to java ones, which currently looks like

(def php-fmt-char->java-fmt-char
  {"Y" "yyyy"
   "m" "mm"
   "d" "dd"
   "H" "HH"
   "i" "mm"
   "s" "ss"
   "c" "yyyy-MM-dd'T'HH:mm:ssXXX"})

@U0482NW9KL1 I like it! Thanks

@U02FVPF04A1 yes this is what I have in my code at teh moment... a long list of defs

It's more idiomatic to have one def with a hash-map to define values than a long list of def expressions, e.g. https://github.com/practicalli/practicalli.github.io/blob/live/src/practicalli/data.cljs