Adding a color scale to loop script

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aaron Harvey on 12 Oct 2015
Commented: Alexandar on 25 Jul 2022
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.
Walter Roberson on 12 Oct 2015
At the time of that plot(), which variable holds the depth that you would like to color code by?
aaron Harvey on 12 Oct 2015
Edited: aaron Harvey on 12 Oct 2015
It would be z at that point, defined in the beginning of the for loop,
for z=[1:2:max(datafile.data(:,28))];

Marius on 12 Oct 2015
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
aaron Harvey on 12 Oct 2015
Edited: aaron Harvey on 12 Oct 2015
Thank-you, That worked perfectly! but is there also a way I can add a colorbar to this? labeled with my N values (or z in my code)
Alexandar on 25 Jul 2022
^Can somebody help with the question above on how to display the colorbar. I have already looked at multiple questions for displayinc colorbars but none of them work since I am also inputting this into a forloop.