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pcolor with legend
From: |
Francesco Potorti` |
Subject: |
pcolor with legend |
Date: |
Fri, 25 Jul 2008 17:53:06 +0200 |
Apparently, pcolor has no legend :(
This is how I created a hand-made legend for pcolor. May be of help to
others.
I used very similar code to create a legend for contourf, too, but I had
to tweak differently the "outerposition" numbers to get a good result.
================================================================
## Redefine pcolor so that last row and columns are not thrown away
function mypcolor(x,y,z)
x0=3*x(1)-x(2);xe=3*x(end)-x(end-1);xm=x(1:end-1)+x(2:end);x=[x0;xm(:);xe]/2;
y0=3*y(1)-y(2);ye=3*y(end)-y(end-1);ym=y(1:end-1)+y(2:end);y=[y0;ym(:);ye]/2;
#x=[x(1);x(:)]+[x(:);x(end)]/2;
#y=[y(1);y(:)]+[y(:);y(end)]/2;
z=[z,z(:,end);z(end,:),z(end,end)];
pcolor(x,y,z);
shading("flat");
endfunction
################################################################
## Colour map (1dB per colour)
subplot(1,2,1);
mypcolor(x,y,z);
colormap(jet(dbmax-dbmin));
caxis([dbmin dbmax]);
## Legend: a vertical bar using the same colour map and axes limits
subplot(1,2,2);
s=linspace(dbmin,dbmax,1000)';
pcolor([dbmin dbmax]/10,s,[s s]);
#set(gca,"yaxislocation","right"); # Y axis disappears in Octave 3.0:(
set(gca,"dataaspectratio",[1 1 1]);
axis("ticy");
shading("flat");
colormap(jet(dbmax-dbmin));
caxis([dbmin dbmax]);
## Reposition and scale the two graphs
set(get(gcf).children(1),"outerposition",[-0.1,-0.1,1.1,1.2])
set(get(gcf).children(2),"outerposition",[0.75,-0.1,0.4,1.2])
#print("-Pcolore","-color","-landscape")
--
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