# PlotSparse

plot the pattern of non nul elements of a sparse matrix

## Calling Sequence

    PlotSparse(A [,style])

## Arguments

A

  a sparse matrix

style

  (optional) a string given the color and/or the marker type of the form "[color][mark]" where color may be a number referring the color you want to use (in the current colormap). If you use the std colormap then color may be one of the following letters :

      k  for black       b  for blue
      r  for red         g  for green
      c  for cyan        m  for magenta
      y  for yellow      t  for turquoise
      G  a dark green

  mark must be one of the following :

      .  point           +  plus
      x  cross           *  circled plus
      D  filled diamond  d  diamond
      ^  upper triangle  v  down triangle
      o  circle

  by default you have "b." (in fact the 2d color) and this is also forced in case of error.

## Description

plot the pattern of non nul elements of a sparse matrix : each non nul element is drawn with a marker. For "big" matrix use essentially the point . as marker

## Examples

    [A,description,ref,mtype] = ReadHBSparse(SCI+"/modules/umfpack/examples/arc130.rua");
    PlotSparse(A,"y+")
    xtitle(ref + "." + mtype + " : " + description)

[A,description,ref,mtype] = ReadHBSparse(SCI+"/modules/umfpack/examples/arc130.rua"); PlotSparse(A,"y+") xtitle(ref + "." + mtype + " : " + description)

## See Also

- ReadHBSparse