Labelling plot lines akin to contour labels

Dear Matlab Community,

I would like to annotate a simple 2D plot line in a similar way to how contour levels are labelled in contour. That is, the line appears broken with some label text centred on the line. The idea here is that one could label multiple plots neatly, without the use of a legend.

Does anybody know a way to do this? Obviously, one could use annotation, but setting this up in a generic way could prove to be difficult (at least for me).

Cheers, Steven.

Answer 1

[Fangjun Jiang]

I don't know any way directly. All I can suggest is to look at contour.m to see if you can make you own. Share with us if you do find a way.

Find this interesting note in contour.m. Might it give you some leads? The function is in clabel.m

%   Thanks to R. Pawlowicz (IOS) [e-mail] for 'contours.m' and 
%   'clabel.m/inline_labels' so that contour now works with parametric
%   surfaces and inline contour labels.

t=0:0.1:7;
y=sin(t);
z=cos(t);
plot(t,t,'r',t,y,'g',t,z,'b',t,y+z,'k');
Strings={'line','sin','cos','sin+cos'};
LabelLine(gca,Strings);

function LabelLine(h_axes,LabelStrings)
h_line=findobj(h_axes,'type','line');
n=length(h_line);
for k=1:n;
    XData=get(h_line(k),'XData');
    YData=get(h_line(k),'YData');
    Ind=round(length(XData)/2);
    text(XData(Ind),YData(Ind),LabelStrings{n-k+1});
end

[Steven White]

I have had a look at the clabel.m code. Unfortunately, this is beyond my Matlab skill set and so I am unable to alter it into something I can use.

Steven.

[Fangjun Jiang]

I think the technique is to use text(). I can build a rudimentary one. Not really a generic function, but don't want to get nothing out after reading the clabel.m code.

[Steven White]

Thanks very much. This is more or less what I am after. I can play with the text properties to change colours etc.

Many thanks,

Steven.

[Sandeep K]

Hello,

Is there any other way of doing this plotting using R2017?

Thank you

Sandeep