Plotting x-y points with Breeze Viz

[Adelbert Chang]

Hello,

If I have something like a Vector[(Double, Double)], where an element (X, Y) represents the x and y coordinates of that elements, is there an easy way I can plot this (just the points)?

Also, is there an easy way to make the X and/or Y axis logscale?

Thanks!

Regards,

-Adelbert

[David Hall]

There isn't support for any of that right now. Sorry. I guess you can
unzip the vector and pass them in. There's nothing for log scale atm.
Open a ticket for both of these?

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[Adelbert Chang]

My mistake, I had not realized you could call plot on a collection of X and Y, though in retrospect that would've been something obvious to test. Apologies, as I am still new to these plotting libraries, dabbling with MATLAB, Python's matplotlib, and Breeze, thankfully all of which seem to have very similar APIs.

I will put in a ticket for logscale.

Keep up the good work!

[Michael Schmitz]

I didn't get it from this thread, but I think Adelbert meant that it's possible to plot two Seqs of Doubles, the first one representing the Xes and the second representing the Ys.

    val points: Seq[(Double, Double)]

    val f = Figure()

    val p = f.subplot(0)

    p += plot(points.map(_._1), points.map(_._2))

[KiranKumar Adam]

Hello,

I'd like to plot some discrete values of DenseVector[Double] with length 2 . I'd like to call this function for 100 iterations in main
 
import breeze.plot._
import breeze.linalg._

object Plotting {

  val f = Figure()
  val p = f.subplot(0)

  p.xlim(-400,400)
  p.ylim(-400,400)
 
  def plotter(state: DenseVector[Double]) = {
   
  // state(0) is x co-ordinate and state(1) is y co-ordinate
   p += plot(state(0),state(1))
  
  }
 
}
I'm trying something similar to plot function in matlab where  linspace() is not needed for me.

[David Hall]

We don't have anything in particular for supporting that. Breeze
really expects you to plot aligned sequences of data. Also, plot is
for line graphs, and scatter is for point graphs, which might be more
useful here.

Try this:

p += scatter(state(0 to 0), state(1 to 1), {_ => 0.01})

-- David

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[KiranKumar Adam]

Hello ,

This is my example on worksheet  and  I'm not getting any results even I tried it

import breeze.linalg._
import breeze.plot._

object test {
  println("Welcome to the Scala worksheet")
   
    var x = DenseVector(1.0,1.0)
   
    val F = DenseMatrix.ones[Double](2,2)
   
    def state(t: DenseVector[Double]) : DenseVector[Double] =
    {
    t := F * t
  }
 
 
 
  val f = Figure()
  val g = f.subplot(0)
  g.xlim(-100,100)
  g.ylim(-100,100)
 
  for( i <- 0 until 10)
  {
     
      x := state(x)
      g += scatter(x(0 to 0), x(1 to 1), {_=>0.01})
  }
 
   
}

On Windows it shows Frame with no plotting and working in Ubuntu it show no frame even. 

On Thursday, January 10, 2013 8:17:40 PM UTC+1, Adelbert Chang wrote:

[KiranKumar Adam]

Hello David,

Figured out the solution thanks for the wonderful package. In future I'll surely contribute to this package target tracking and localization algorithm very soon.

Regards,
-kirankumar

On Thursday, January 10, 2013 8:17:40 PM UTC+1, Adelbert Chang wrote:

[David Hall]

glad you figured it out!

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