working on corrplot and recipes

src/Plots.jl

@@ -72,9 +72,6 @@ export
   getColor,
   getColorZ,
 
-  PlotRecipe,
-  EllipseRecipe,
-
   debugplots,
 
   supportedArgs,
@@ -82,7 +79,12 @@ export
   supportedTypes,
   supportedStyles,
   supportedMarkers,
-  subplotSupported
+  subplotSupported,
+
+  # recipes
+  PlotRecipe,
+  EllipseRecipe,
+  corrplot
 
 # ---------------------------------------------------------
 

src/backends/gadfly.jl

@@ -85,7 +85,10 @@ function createGadflyPlotObject(d::Dict)
     unshift!(gplt.guides, Gadfly.Guide.manual_color_key("", @compat(AbstractString)[], Color[]))
   end
 
-  gplt.theme = Gadfly.Theme(background_color = getColor(d[:background_color]))
+  gplt.theme = Gadfly.Theme(
+          background_color = getColor(d[:background_color]),
+          plot_padding = 1 * Gadfly.mm,
+        )
   gplt
 end
 
@@ -493,7 +496,7 @@ function linkXAxis(subplt::Subplot{GadflyPackage})
     for (i,(r,c)) in enumerate(subplt.layout)
         gplt = subplt.plts[i].o
         if r < nrows(subplt.layout)
-            #addOrReplace(gplt.guides, Gadfly.Guide.xticks; label=false)
+            addOrReplace(gplt.guides, Gadfly.Guide.xticks; label=false)
             addOrReplace(gplt.guides, Gadfly.Guide.xlabel, "")
         end
     end
@@ -516,7 +519,7 @@ function linkYAxis(subplt::Subplot{GadflyPackage})
     for (i,(r,c)) in enumerate(subplt.layout)
         gplt = subplt.plts[i].o
         if c > 1
-            #addOrReplace(gplt.guides, Gadfly.Guide.yticks; label=false)
+            addOrReplace(gplt.guides, Gadfly.Guide.yticks; label=false)
             addOrReplace(gplt.guides, Gadfly.Guide.ylabel, "")
         end
     end

src/recipes.jl

@@ -54,3 +54,39 @@ function getRecipeArgs(ep::EllipseRecipe)
   [(:line, (3, [:dot :solid], [:red :blue], :path))]
 end
 
+# -------------------------------------------------
+
+
+"Do a correlation plot"
+function corrplot{T<:Real,S<:Real}(mat::AMat{T}, corrmat::AMat{S};
+                                   colors = :redsblues)
+  m = size(mat,2)
+
+  # might be a mistake? 
+  @assert m <= 10
+  @assert size(corrmat) == (m,m)
+
+  # create a subplot grid, and a gradient from -1 to 1
+  p = subplot(zeros(1,m^2), n=m^2, link=true)
+  cgrad = ColorGradient(:redsblues,[-1,1])
+
+  # make all the plots
+  for i in 1:m
+    for j in 1:m
+      idx = p.layout[i,j]
+      if i==j
+        # histogram on diagonal
+        plt = histogram(mat[:,i], c=:black)
+      else
+        # scatter plots off-diagonal, color determined by correlation
+        plt = scatter(mat[:,j], mat[:,i], ms=4, c=getColorZ(cgrad, corrmat[i,j]))
+      end
+      # replace the plt
+      p.plts[idx] = plt
+    end
+  end
+
+  # link the axes
+  subplot!(p, link=true)
+end
+