How to export a figure in Live Script?

Question

free5721 2020-11-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/669768-how-to-export-a-figure-in-live-script

评论： free5721 2020-12-3

采纳的回答： free5721

I am attempting to use the command:

saveas(gcf,'picture.png')

to save a figure from a Live Script. But to no success. An image file is NOT created at the destination.

The command works fine outside of Live Script. An image file IS created at the destination.

The only article that seemed to address the issue was...

https://www.mathworks.com/matlabcentral/answers/417087-exporting-figures-from-live-script

but to no success.

Another article led me to speculate that perhaps it is not supported in Live Script.

https://www.mathworks.com/matlabcentral/answers/468329-displaying-an-externally-saved-figure-in-live-script

Any thoughts? Thanks.

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Sindar 2020-12-2

在 MATLAB Online 中打开

Try this

print(gcf,'-dpng','picture.png')

I'm not sure if I actually printed anything from a livescript in 2018b, but this is my go-to method in general, and works for 2020a livescripts

Note that there are other issues with saving livescripts as .fig, and it's possible they are showing up here. You might try this (and if it works, do what I do and create a wrapper with the weirdness for each format so you rarely have to think about it again)

if ~strcmp(get(this_fig,'visible'),'on')
    invisible = true;
    set(gcf,"Visible","on");
end
print(gcf,'-dpng','picture.png')
if invisible
    set(gcf,"Visible","off");
    invisible = false;
end

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Answer 1

free5721 2020-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/669768-how-to-export-a-figure-in-live-script#answer_563068

编辑：free5721 2020-12-2

Thank you Sindar!

I used your first suggestion

print(gcf,'-dpng','picture.png')

within the Live Script Environment, and the figure was saved at the destination.

I would never have thought to use a print command. I looked up the print help menu and its summary says, "Print figure or save to specific file format" and an example it provides about saving a figure as PNG image is print('BarPlot','-dpng')

I looked up the saveas help menu and its summary says, "Save figure to specific file format"

and an example it provides about saving a figure as a PNG file is saveas(gcf,'Barchart.png').

So I wonder what the issue is between these two commands?

Nevertheless, thank again. Much appreciated! Have a good day!

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Sindar 2020-12-2

Yeah, I have no idea why one works and the other doesn't, but I've moved to using print for everything except .fig, where I use saveas

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Answer 2

Sindar 2020-12-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/669768-how-to-export-a-figure-in-live-script#answer_563488

在 MATLAB Online 中打开

Here's my wrapper function, with usage like

save_myfig(gcf,'spectrum_1e12',{'png','fig'})

I've been using some variation for versions since 2007b, and currently use for 2018b and 2020a, but I haven't extensively tested backwards compatibility

function save_myfig(this_fig,file_name,file_ext)
% Saves <this_fig> to <file_name> as a <file_ext>
%   If multiple extensions are given, saves as each format
%   If extension is not recognized, it tries anyway
%   'pdf_small' creates a low-resolution PDF
% make sure the figure has updated
drawnow
ext_options = {'fig','pdf','png','jpg','jpeg','eps','pdf_small'};
%% Parse inputs
% if no handle given, save the current figure
if nargin<1 || isempty(this_fig)
    this_fig=gcf;
end
% if no name given, call it "figure.<ext>"
if (nargin<2 || isempty(file_name))
    file_name='figure';
% trim off existing extensions
elseif ~isempty(file_name) && endsWith(file_name,ext_options)
    [filepath,name,~] = fileparts(file_name);
    file_name = [filepath filesep name];
end
% make sure the arguments are in the right format
file_name = convertStringsToChars(file_name);
if nargin<3 || isempty(file_ext)
    file_ext={};
elseif ischar(file_ext)
    file_ext={file_ext};
elseif isnumeric(file_ext)
    file_ext=ext_options(file_ext);
end
%% check for each known extenion and save in that format
% JPG
if any(strcmpi(file_ext,'jpg')) || any(strcmpi(file_ext,'jpeg'))
    print(this_fig,'-djpeg',[file_name '.jpg'])
end
% PDF (low resolution)
if any(strcmpi(file_ext,'pdf_small'))
    % I always print in landscape, but this may not make sense with your figures
    orient(this_fig,'landscape');
    print(this_fig,'-dpdf','-r72','-bestfit',[file_name '.pdf']);
    orient(this_fig,'portrait');
end
% PNG
if any(strcmpi(file_ext,'png'))
    print(this_fig,'-dpng',[file_name '.png'])
end
% EPS
if any(strcmpi(file_ext,'eps'))
    print(this_fig,'-depsc',[file_name '.eps'])
end
% PDF (normal resolution)
if any(strcmpi(file_ext,'pdf'))
    % I always print in landscape, but this may not make sense with your figures
    orient(this_fig,'landscape');
    tmp=get(this_fig,'Position');
    set(this_fig,'PaperUnits','points','PaperSize',tmp(3:4))
    print(this_fig,'-dpdf','-r300',[file_name '.pdf']);
    orient(this_fig,'portrait');
end
if any(strcmpi(file_ext,'fig'))
    % clear warnings for the try-catch below
    lastwarn('')
    % check whether the figure is visible
    invisible = false;
    if ~strcmp(get(this_fig,'visible'),'on')
        invisible = true;
        set(this_fig,"Visible","on");
    end
    % try the normal way
    try
        saveas(this_fig, [file_name '.fig'],'fig')
    catch
        % warning('Variable ''d'', is larger than 10GB and could not be saved')
    end
    warnMsg = lastwarn;
    % use v7.3 saving for large data
    if ~isempty(warnMsg)
        % warning('Fig Variable too large for v7, using v7.3 saving')
        hgsave(this_fig, [file_name '.fig'], '-v7.3');
        fprintf(['Fig actually saved\n'])
    end
    if invisible
        set(this_fig,"Visible","off");
        invisible = false;
    end
end
% Try unrecognized file extensions
for ind = 1:length(file_ext)
    if ~any(strcmp(file_ext{ind},ext_options))
        print(this_fig,['-d' file_ext{ind}],[file_name '.' file_ext{ind}])
    end
end
end