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Asked: 2026-06-13T14:12:18+00:00

A beginners question. running clojure using lein + emacs + nrepl. I am slightly

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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?

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1 Answer

  1. Editorial Team

    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.

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