MATLAB: Changing the line properties of a loaded figure?

Question

I\'ve got a very simple question, for MATLAB users:

If I load a figure file (.fig) with the load command, is there any way to change the plotted lines properties fro

Answer 1

In addition to @yuk answer, if you have a legend drawn as well,

hline = findobj(gcf, 'type', 'line');

will return N x 3 lines (or more precisely - lines plotted + 2x lines in legend). I will here look only at the case when all the lines that are plotted are also in the legend.

The sequencing is weird: in case of 5 lines (let us note them 1 to 5) plotted and the legend added, you will have

hline:
1 : 5 th line (mistical)    
2 : 5 th line (in legend)
3 : 4 th line (mistical)    
4 : 4 th line (in legend)
5 : 3 th line (mistical)    
6 : 3 th line (in legend)
7 : 2 th line (mistical)    
8 : 2 th line (in legend)
9 : 1 th line (mistical)    
10: 1 th line (in legend)
11: 5 th line (in plot)
12: 4 th line (in plot)
13: 3 th line (in plot)
14: 2 th line (in plot)
15: 1 th line (in plot)

As a solution (friday evening procrastination) I made this little baby:

Solution 1: if you don't want to reset the legend

Detect if there is a legend and how many lines are plotted:

hline = findobj(gcf, 'type', 'line');
isThereLegend=(~isempty(findobj(gcf,'Type','axes','Tag','legend')))

if(isThereLegend)
    nLines=length(hline)/3
else
    nLines=length(hline)
end

For each line find the right handles and do the stuff for that line (it will apply also to the corresponding legend line)

for iterLine=1:nLines
    mInd=nLines-iterLine+1
    if(isThereLegend)
        set(hline([(mInd*2-1) (mInd*2) (2*nLines+mInd)]),'LineWidth',iterLine) 
    else
    set(hline(mInd),'LineWidth',iterLine)     
    end
end

This makes every i-th line with the width=i and here you can add the automated property changing;

Solution 2: Keep it simple

Get rid of the legend, take care of the lines, reset legend.

legend off
hline = findobj(gcf, 'type', 'line');
nLines=length(hline)

for iterLine=1:nLines
    mInd=nLines-iterLine+1
    set(hline(mInd),'LineWidth',iterLine)     
end
legend show

This might not be suitable for situations when the legend must be placed in some speciffic place etc.