MATLAB: Adding a color scale to loop script

colorfor loop

Hey. So I have a loop script plotting lines ontop of each other on the same figure. Its messy but it works.
function TempSalplot(datafile)
datafile=importdata(datafile);
A=datafile.data;
%depth,distance,salinity,temp are in column 28,2,14,11 of datafile respectively;  
    for z=[1:2:max(datafile.data(:,28))];
        for depthi=[1:length(A(:,28))];
            if A(depthi,28)>z-0.5 & A(depthi,28)<z+0.5;
            B(depthi,1)=A(depthi,2);
            B(depthi,2)=A(depthi,14);
            B(depthi,3)=A(depthi,11);
            %delete zero rows in new matrix 'B'
            B(all(B==0,2),:)=[];
            % average repeated measurements for same distances 
            [C,ia,idx]=unique(B(:,1),'stable');
            val=accumarray(idx,B(:,2),[],@mean);  
            M12=[C val];
            [C,ia,idx]=unique(B(:,1),'stable');
            val=accumarray(idx,B(:,3),[],@mean);  
            M13=[C val];
            M=[M12,M13(:,2)];
            end
        end
        plot(M(:,2),M(:,3),'.-','color',rand(1,3))
        hold on
    end
end
I would like it, to rather than plot each line with a random colour, to plot each new line according to a colour scale so I can put a color bar on it. Or at least represent that each new line is increasing depth of 1m. Thanks for any help.

Best Answer

Hi Aaron, What I do when I plot many plots in a for-loop (N plots) is first create a "colour matrix" (col) based on a colormap (e.g. 'jet'):
col = jet(N);
for i = 1:N
  plot( myXYvals(:,N), 'Color', col(N,:) )
end
Hope this helps, at least giving you an idea... Marius
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