Scalala Plotting: Compile Error

Question

I'm trying to implement the answer to this question: https://stackoverflow.com/questions/3704647/can-you-recommend-a-charting-library-for-scala/3704974#3704974

I've downloaded and compiled Scalala from the git hub and placed the scalala_2.8.1-1.0.0.RC2-SNAPSHOT.jar in my lib folder (I'm using SBT to do my build). Here's the code:

import scalala.library.Plotting
object ScalalaTest extends Application
{

  val x = Plotting.linspace(0,1);
}

I'm getting the following error:

[error] /src/main/scala/ScalalaTest.scala:6: value linspace is not a member of object scalala.library.Plotting
[error]   val x = Plotting.linspace(0,1);
[error]                    ^
[error] one error found

It looks like my scala compiler recognizes the scalala package but doesn't recognize members of Plotting (I've tried others besides linspace). This is strange because according to the Scalala API, linspace is a member of Plotting.

I believe there should be a `scalala` tag but don't have the rep to add it. — dsg, May 21 '11 at 08:09
Have you checked the source code? Maybe your version isn't matching the scaladoc version? — Jens Schauder, May 21 '11 at 11:36
Mmm... funny name for a library. Sounds like an old Spanish song :) — Diego Sevilla, May 23 '11 at 17:30
@Diego Sevilla -- Agreed! It reminds me of "Ding Dong Song" by Günther. What's the Spanish song you're thinking of? — dsg, May 23 '11 at 21:26

score 2 · Answer 1 · edited Jun 15 '12 at 05:38

2

That used to work and was nice and elegant - it seems the current way is:

val x = DenseVector.range(0,100) / 100.0;
plot.hold = true
plot(x, x :^ 2)
plot(x, x :^ 3, '.')
xlabel("x axis")
ylabel("y axis")
saveas("lines.png")

This needs includes:

import scalala.tensor.dense.DenseVector
import scalala.library.Plotting._

The SBT dependencies are:

  val scalaToolsSnapshots = "Scala Tools Snapshots" at "http://scala-tools.org/repo-snapshots/"
  val ScalaNLPMaven2 = "ScalaNLP Maven2" at "http://repo.scalanlp.org/repo/"
  val ondex = "ondex" at "http://ondex.rothamsted.bbsrc.ac.uk/nexus/content/groups/public/"

  val scalala = "org.scalala" %% "scalala" % "1.0.0.RC2-SNAPSHOT"

edited Jun 15 '12 at 05:38

Renaud

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answered May 21 '11 at 22:25

Johan Prinsloo

1,188
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@Johan Prinsloo -- What are the packages to import for this to work? – dsg May 21 '11 at 22:30
Import scalala.tensor.dense._ Tested with 1.0.0.RC2-SNAPSHOT – Johan Prinsloo May 21 '11 at 22:36
@Johan Prinsloo -- There's gotta be more. I'm still getting value not found on `plot`, `xlabel`, and `ylabel`. – dsg May 21 '11 at 22:52
tensor.dense._ is just for the new range method. Include scalala.library.Plotting._ + whetever else your code needs. I am using: import scalala.tensor.dense._ import scalala.library._ import scalala.library.Library._ import scalala.library.LinearAlgebra._ import scalala.library.Statistics._ import scalala.library.Plotting._ //import scalala.library.Vectors import scalala.operators.Implicits._ – Johan Prinsloo May 22 '11 at 00:56
@Johan Prinsloo -- I think something is wrong with my build. I get: `Vectors is not a member of scalala.library`. – dsg May 22 '11 at 05:05
The easiest way to make sure you get the correct stuff is top simply declare the dependency in a SBT build - I edited to include the correct dependencies - this works in SBT 0.7.7 – Johan Prinsloo May 23 '11 at 17:10

score 0 · Answer 2 · answered May 21 '11 at 05:58

0

linspace seems to be a member of the trait Plotting, not of the companion object. So you'll have to create an instance of Plotting (or anything with Plotting) in order to access that method.

answered May 21 '11 at 05:58

Jens Schauder

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`Plotting` has a companion: `object Plotting extends Plotting`. The other subclass is `scalala.Scalala`, which I'm having trouble referencing. The line `import scalala.Scalala` throws the following compiler error: `Scalala is not a member of scalala`. – dsg May 21 '11 at 07:00

Scalala Plotting: Compile Error

2 Answers2