scala module after sbt installation - scala

Question

May I ask some newbie question here:
My goal is to use Breeze module (0.10) in Scala (2.11.5), and I follow:
$ sbt
set scalaVersion := "2.10.3" // or 2.11.3
set libraryDependencies += "org.scalanlp" %% "breeze" % "0.10"
set resolvers += "Sonatype Releases" at "https://oss.sonatype.org/content/repositories/releases/"
console
and actually, it ran well, and at the end, when I got the prompt I can do this well (some example from the Breeze site)
import breeze.linalg._
However, after I exit and re-enter Scala by just
$ scala
Welcome to Scala version 2.11.5 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_75).
Type in expressions to have them evaluated.
Type :help for more information.
scala>
and with some excitement, I tried:
scala> import breeze.linalg._
<console>:7: error: not found: value breeze
import breeze.linalg._
^
It seems the module is "gone" after the installation ...
May I know how to get "Breeze" installed permanently? or did I miss any linkage here?
Your answer is much appreciated.

Answer 1

The scala/java ecosystem just doesn't work that way; the global classpath doesn't get changed because some project uses a jar.
Your easiest solution is to just make a bash alias (e.g. brscala) that invokes the same sbt incantation.
There are ways to make it work (involving putting symlinks to breeze and all of its dependencies in $SCALA_HOME/lib), but that's definitely not recommended.

Answer 2

Looks like you want to access the libraries from the Terminal
Specify the dependencies (here breeze & saddle) in build.sbt, e.g.
scalaVersion := "2.10.4"
resolvers ++= Seq(
"Sonatype OSS Releases" at "http://oss.sonatype.org/content/repositories/releases/",
"Sonatype OSS Snapshots" at "http://oss.sonatype.org/content/repositories/snapshots/",
"Sonatype Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/",
"Sonatype Releases" at "https://oss.sonatype.org/content/repositories/releases/"
)
libraryDependencies ++= Seq(
"joda-time" % "joda-time" % "2.1",
"org.joda" % "joda-convert" % "1.2",
"org.scala-saddle" %% "saddle-core" % "1.3.+",
"org.specs2" %% "specs2" % "2.4.1" % "test",
"org.scalacheck" %% "scalacheck" % "1.11.3" % "test",
"junit" % "junit" % "4.11" % "test",
"org.scalanlp" %% "breeze" % "0.12",
"org.scalanlp" %% "breeze-natives" % "0.12",
"org.scalanlp" %% "breeze-viz" % "0.12"
)
initialCommands := """
import org.joda.time.DateTime
import org.saddle._
import org.saddle.time._
import org.saddle.io._
import me.first_install_saddle._
import breeze.linalg._"""
Assuming you are cd into the directory of build.sbt: run sbt update to install the dependencies
Then instead of just scala, run sbt console in Terminal
From there you can access the libraries from the Terminal.