yline disappeared after closing a saved figure when reopening

Hi, I am creating a figure with multiple axis (such as subplot but manually). Part of the figure are also multiple xlines. When creating the figure with my script everything seems to work fine. I also save the figure and let the script close it automatically. When reopening the saved *.fig file the xlines disappeared and I have no clue what to try next.

fh = struct([]);                                        % figurehandler which holds 4 axies all similar built like ax3
fh(k1).fh = figure;                                     % k1 is a counter in a for loop
fh(k1).ax3 = axes(fh(k1).fh);
fh(k1).ax3.Position = [0.06,0.25,0.7,0.2];
fh(k1).ax3.YLim = [-1 1];
grid(fh(k1).ax3,"on");
hold(fh(k1).ax3, "on");
fh(k1).ax3.XLim = [-0.01 inf];

yyaxis(fh(k1).ax3,"left");
hold(fh(k1).ax3, "on");
linkaxes([fh(k1).ax, fh(k1).ax3], "x");
yline(fh(k1).ax3, [value1_std -value1_std],"--b","DisplayName","Value1");
yyaxis(fh(k1).ax3,"right");
hold(fh(k1).ax3, "on");                                   % added the holds to make sure nothing will be overwritten
yline(fh(k1).ax3, [value2_std -value2_std],"--", "Color",[0.8500, 0.3250, 0.0980],"DisplayName","Value2");

hold([fh(k1).ax,fh(k1).ax2,fh(k1).ax3,fh(k1).ax4], "off");
%saveas(fh(k1).fh,fullfile(savefolder,{sprintf('Step%d.fig', k1)})); %
%tried this but causes the same issue
savefig(fh(k1).fh,fullfile(savefolder,{sprintf('Step%d.fig', k1)}));
print(fh(k1).fh,fullfile(savefolder,{sprintf('Step%d', k1)}),"-dpng","-r400");
close(fh(k1).fh);

However when saving the figure as png the lines are there, as they were when i created the plot. Both ylines disappeared

[Matt J]

Your code segment is not complete enough for us to run it as a standalone,

fh = struct([]);                                        % figurehandler which holds 4 axies all similar built like ax3
fh(k1).fh = figure;     

Unrecognized function or variable 'k1'.

[Jonas]

at least it would be helpful to have the fig and the png from @John Pausder

I edited the code such that it at least runs here, the changes are only minor and should have no impact

fh = struct([]);     % figurehandler which holds 4 axies all similar built like ax3
k1=1;
fh(k1).fh = figure;                                     % k1 is a counter in a for loop
fh(k1).ax3 = axes(fh(k1).fh);
fh(k1).ax3.Position = [0.06,0.25,0.7,0.2];
fh(k1).ax3.YLim = [-1 1];
grid(fh(k1).ax3,"on");
hold(fh(k1).ax3, "on");
fh(k1).ax3.XLim = [-0.01 inf];

yyaxis(fh(k1).ax3,"left");
hold(fh(k1).ax3, "on");
yline(fh(k1).ax3, 0.5,"--b","DisplayName","Value1");
yyaxis(fh(k1).ax3,"right");
hold(fh(k1).ax3, "on");                                   % added the holds to make sure nothing will be overwritten
yline(fh(k1).ax3, 5,"--", "Color",[0.8500, 0.3250, 0.0980],"DisplayName","Value2");

%saveas(fh(k1).fh,fullfile(savefolder,{sprintf('Step%d.fig', k1)})); %
%tried this but causes the same issue
savefolder=cd;
savefig(fh(k1).fh,fullfile(savefolder,sprintf('Step%d.fig', k1)));
close(fh(k1).fh);

[John Pausder]

@Matt J I know. I have intentionally just copied the relevant code. As commented above k1 ist just a counter variable.

[John Pausder]

@Jonas as have you been able to recreate the issue? When I run your code snipped and place a breakpoint just before closing the fig, I can see the ylines. Yet, as I reopen the saved figure they are gone just as I described..

[Jonas]

@John Pausder no, i cannot reproduce this. everything fine running on 2022a. i can see both ylines

Answer 1

[Animesh]

Hey @John Pausder

I have been encountering a similar issue while working with “xline” and “yyaxis”. The only workaround I can think of is to use “line” instead of “yline”.

Here is something you can do to replicate the similar behaviour using “line”:

% Left Y-axis 
yyaxis(fh(k1).ax3, "left"); 
hold(fh(k1).ax3, "on"); 
% Draw a line at y = 0.5 using the `line` function 
x_values = fh(k1).ax3.XLim; % Use current x-axis limits 
line(x_values, [0.5 0.5], 'LineStyle', '--', 'Color', 'b', 'Parent', fh(k1).ax3, 'DisplayName', 'Value1'); 
% Right Y-axis 
yyaxis(fh(k1).ax3, "right"); 
hold(fh(k1).ax3, "on"); 
% Draw a line at y = 5 using the `line` function 
line(x_values, [5 5], 'LineStyle', '--', 'Color', [0.8500, 0.3250, 0.0980], 'Parent', fh(k1).ax3, 'DisplayName', 'Value2'); 

You can refer the following MathWorks documentation for more information on "line"

https://www.mathworks.com/help/matlab/ref/line.html

[John Pausder]

Thank you @Animesh. I also used another workaround by creating a vecotor with the length of the represented data, just as one value and plotted this. I think yours is the better option.

c_std_vec = zeros(length(data(datastart:dataend)) ,2);
c_std_vec(:,1) = data.std;
c_std_vec(:,2) = - data.std;
plot(fh(k1).ax3, timedata(datastart:dataend), c_std_v