clojure namespaces .core file and repl

Question

A beginners question. running clojure using lein + emacs + nrepl. I am slightly confused about the following: I wish to use the exponent function. This function lives in the following place `clojure.math.numeric-tower`. I add `[org.clojure/math.numeric-tower "0.0.1"]` to the dependencies and run `lein deps`. Now is it possible (I'm sure it is possible) to add this to my `.core ns` as follows: ``` (ns learning.core (:require [clojure.math.numeric-tower :as math])) (def i-know-the-answer (math/expt 2 10)) ``` now when I try to load (`ctl-x e`) this into the REPL, it throws errors. `clojure.lang.Compiler$CompilerException: java.lang.RuntimeException: No such namespace: math, compiling:(NO_SOURCE_PATH:2)` do the dependencies need to be loaded into the REPL directly? Can I not just change the source file / recompile it and use that?

Accepted Answer

Load the file with ctrl-c ctrl-l then Switch your repl to the namespace in that file with either

```
(in-ns 'learning.core)
```

Or hit ctrl-c alt-n from the Clojure buffer to switch the repl to the buffer's namespace. You can tell if it worked by looking at the prompt in the repl.

clojure namespaces .core file and repl

Solution

Problem