MATLAB: Display axis values Line Legends??

legendsplot

Hello every one, when I plot a matrix e.g x= [ 8 36 36; 8 15 15; 8 25 25; 8 3 3], I would like to display the end value of each row for as a legend for each line on the plot.

I tried with 'num2str(x(1,end)),……' comand which works but off course for larger matrices it would b a headache, Is there any possible short command for the whole Action

Best Regards Ali

Best Answer

You can use a loop:

[m,n] = size(x);
legendText = cell(1, m);
for k = 1:m
  legendText{k} = num2str(x(k, n));
end

[EDITED after comment]

x = rand(10, 5);
h = plot(x);
... Instert code from above here
legend(h, legendText);

See doc legend for more details and examples. Reading the documentation is very useful in Matlab, because this is (still, even with the new layout) the most productive documentation I've seen (except for the one of my hammer).

Related Solutions

MATLAB: How to create a vector of markers for a scatter plot

...
c=[102, 215, 209;253,174,97;215,25,28]/255;
m=['o','d','s'];
figure, hold on
for i=1:size(x,2)
  scatter (x(:,i), y(:,i), 'MarkerFaceColor', c(i,:),'Marker',m(i))
end

First thought you wanted one by column and the other by row; that's not doable except by every point an object...this is ok as each row is a single object.

ADDENDUM

OK, so my first thought was right; the above is right answer to wrong Q??? :)

You're fortunate there are more than twelve possible markers already defined; you do just like for the colors, define(*) an array of their names and use it...

m={'+', 'o', '*', '.', 'x', 'square', 'diamond', 'v', '^', '>', '<', 'pentagram'};
[nr,nc]=size(x);
for i=1:nr
  for j=1:nc
    scatter(x(i,j),y(i,j),'MarkerFaceColor',c(j,:),'Marker',m{i})
  end
end

(*) I created the list by causing scatter to error on a bad call at which it echos the allowable list of names a la the list in the doc. There has to be a way to use the default marker order vector and factory defaults for the markers to automate this but I've never been able to get through the maze to figure out how to get to the information in useful manner...for all the doc there is, much of HG2 is highly opaque and almost impenetrable to the casual user who doesn't have time nor inclination to learn the details of the object hierarchy. It's like being a casual Excel user and try to write a "quick" macro--just ain't a-gonna' happen. :(

MATLAB: Holding legend on a Matlab plot inside a loop

Make a cell array and then call legend with it on every iteration.

H = rand(5, 20);
[rows, columns] = size(H);
t = 1 : columns;
subplot(2,2,1)
plot(t,H(1,:)) 
grid on;
xlabel('t [s]')
ylabel('H [m]')
legendText = {'Plot #1'};
for k = 2 : rows
  % holds old plot for multi-line plots
  hold all
  plot(t,H(k,:));
  legendText{k} = sprintf('Plot #%d', k);
  legend(legendText);
  drawnow; % Force screen refresh.
end

Best Answer

Related Solutions

MATLAB: How to create a vector of markers for a scatter plot

MATLAB: Holding legend on a Matlab plot inside a loop

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