export_fig problem with linebreak in title

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Dominik
Dominik 2025-7-14
编辑： Ronit 2025-7-16
I try to export my figure as pdf with export_fig. Some of the titles have linebreaks.
img_sos = rand(64);
img_oar_pixel = rand(64);
img_oar_block = rand(64);
snr_sos = rand(64)*250;
snr_oar_pixel = rand(64)*250;
snr_oar_block = rand(64)*250;
snr_max = ceil(max([snr_sos(:); snr_oar_pixel(:); snr_oar_block(:)]));
snr_max_50 = ceil(snr_max / 50) * 50;
% Layout-Parameter
tile_size_cm = 4.0; % image size in cm
n_cols = 3;
n_rows = 2;
padding_cm = 0.8;
spacing_cm = 0.3;
colorbar_width_cm = 0.3; % colorbar width
fig_width_cm = padding_cm*2 + n_cols*tile_size_cm + (n_cols-1)*spacing_cm + colorbar_width_cm + 0.3; % extra rechts
fig_height_cm = padding_cm*2 + n_rows*tile_size_cm + (n_rows-1)*spacing_cm;
f = figure('Units', 'centimeters', ...
'Position', [5 5 fig_width_cm fig_height_cm], ...
'PaperUnits', 'centimeters', ...
'PaperSize', [fig_width_cm fig_height_cm], ...
'PaperPositionMode', 'manual', ...
'PaperPosition', [0 0 fig_width_cm fig_height_cm]);
cm2norm_w = @(x) x / fig_width_cm;
cm2norm_h = @(x) x / fig_height_cm;
imgs1 = {img_sos, img_oar_pixel, img_oar_block};
titles1 = {sprintf('Sum-of-Squares'), ...
sprintf('Adaptive Kombination\n(Pixelweise)'), ...
sprintf('Adaptive Kombination\n(Blockweise)')};
clim1 = [0 1];
cmap1 = jet;
for k = 1:3
row = 2; col = k; % upper row = row 2
left = cm2norm_w(padding_cm + (col-1)*(tile_size_cm + spacing_cm));
bottom = cm2norm_h(padding_cm + (n_rows-row)*(tile_size_cm + spacing_cm));
ax1(k) = axes('Position', [left bottom cm2norm_w(tile_size_cm) cm2norm_h(tile_size_cm)]);
imagesc(imgs1{k}, clim1);
axis image off;
colormap(ax1(k), cmap1);
end
cb1_left = cm2norm_w(padding_cm + n_cols*tile_size_cm + (n_cols-1)*spacing_cm + 0.1);
cb1_bottom = cm2norm_h(padding_cm + tile_size_cm + spacing_cm);
cb1_height = cm2norm_h(tile_size_cm);
cb1 = colorbar('Position', [cb1_left cb1_bottom cm2norm_w(colorbar_width_cm) cb1_height]);
cb1.Label.String = 'Normierte Signalintensit\"at';
cb1.Label.Interpreter = 'latex';
cb1.Label.FontSize = 10;
cb1.Ticks = 0:0.2:1;
imgs2 = {snr_sos, snr_oar_pixel, snr_oar_block};
clim2 = [0 snr_max_50];
cmap2 = hot;
for k = 1:3
row = 1; col = k; % bottom row = row 1
left = cm2norm_w(padding_cm + (col-1)*(tile_size_cm + spacing_cm));
bottom = cm2norm_h(padding_cm + (n_rows-row)*(tile_size_cm + spacing_cm));
ax2(k) = axes('Position', [left bottom cm2norm_w(tile_size_cm) cm2norm_h(tile_size_cm)]);
imagesc(imgs2{k}, clim2);
axis image off;
colormap(ax2(k), cmap2);
title_k = titles1(k);
title(cell2str(title_k), 'FontSize', 10, 'Interpreter', 'latex', ...
'FontName', 'Latin Modern Roman');
end
cb2_left = cb1_left;
cb2_bottom = cm2norm_h(padding_cm);
cb2_height = cm2norm_h(tile_size_cm);
cb2 = colorbar('Position', [cb2_left cb2_bottom cm2norm_w(colorbar_width_cm) cb2_height]);
cb2.Label.String = '$\mathrm{SNR}$';
cb2.Label.Interpreter = 'latex';
cb2.Label.FontSize = 10;
cb2.Ticks = 0:50:snr_max_50;
export_fig('Test_Vergleich.pdf', '-pdf', '-transparent');
But when I do this I get the following error:
Error using horzcat
Inconsistent concatenation dimensions because a 1-by-3 'char' array was converted to a 1-by-1 'cell' array. Consider creating arrays of the same type
before concatenating.
Error in print2eps (line 605)
fstrm = regexprep(fstrm, '(%%Title:)[^\n]*\n', ['$1 ' title_str '\n']);
^^^^^
Error in export_fig (line 1146)
print2eps(tmp_nam, fig, options, printArgs{:}); %winopen(tmp_nam)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error in Copy_of_Vergleich_Mehrkanalkombination (line 99)
export_fig('Test_Vergleich.pdf', '-pdf', '-transparent');
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Without linebreak it works.
  2 个评论
Matt J
Matt J 2025-7-14
I get a different error,
Warning: Error in state of SceneNode.
String scalar or character vector must have valid interpreter syntax:
Normierte Signalintensit\\"at
> In defaulterrorcallback (line 12)
In matlab.graphics.illustration/ColorBar/get.Label
In test (line 55)
Unrecognized function or variable 'cell2str'.
Error in test (line 74)
title(cell2str(title_k), 'FontSize', 10, 'Interpreter', 'latex', ...
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Rik
Rik 2025-7-14
Ran in:
Unfortunately, this code can't run online either, even with a cell2str stub function.
img_sos = rand(64);
img_oar_pixel = rand(64);
img_oar_block = rand(64);
snr_sos = rand(64)*250;
snr_oar_pixel = rand(64)*250;
snr_oar_block = rand(64)*250;
snr_max = ceil(max([snr_sos(:); snr_oar_pixel(:); snr_oar_block(:)]));
snr_max_50 = ceil(snr_max / 50) * 50;
% Layout-Parameter
tile_size_cm = 4.0; % image size in cm
n_cols = 3;
n_rows = 2;
padding_cm = 0.8;
spacing_cm = 0.3;
colorbar_width_cm = 0.3; % colorbar width
fig_width_cm = padding_cm*2 + n_cols*tile_size_cm + (n_cols-1)*spacing_cm + colorbar_width_cm + 0.3; % extra rechts
fig_height_cm = padding_cm*2 + n_rows*tile_size_cm + (n_rows-1)*spacing_cm;
f = figure('Units', 'centimeters', ...
'Position', [5 5 fig_width_cm fig_height_cm], ...
'PaperUnits', 'centimeters', ...
'PaperSize', [fig_width_cm fig_height_cm], ...
'PaperPositionMode', 'manual', ...
'PaperPosition', [0 0 fig_width_cm fig_height_cm]);
cm2norm_w = @(x) x / fig_width_cm;
cm2norm_h = @(x) x / fig_height_cm;
imgs1 = {img_sos, img_oar_pixel, img_oar_block};
titles1 = {sprintf('Sum-of-Squares'), ...
sprintf('Adaptive Kombination\n(Pixelweise)'), ...
sprintf('Adaptive Kombination\n(Blockweise)')};
clim1 = [0 1];
cmap1 = jet;
for k = 1:3
row = 2; col = k; % upper row = row 2
left = cm2norm_w(padding_cm + (col-1)*(tile_size_cm + spacing_cm));
bottom = cm2norm_h(padding_cm + (n_rows-row)*(tile_size_cm + spacing_cm));
ax1(k) = axes('Position', [left bottom cm2norm_w(tile_size_cm) cm2norm_h(tile_size_cm)]);
imagesc(imgs1{k}, clim1);
axis image off;
colormap(ax1(k), cmap1);
end
cb1_left = cm2norm_w(padding_cm + n_cols*tile_size_cm + (n_cols-1)*spacing_cm + 0.1);
cb1_bottom = cm2norm_h(padding_cm + tile_size_cm + spacing_cm);
cb1_height = cm2norm_h(tile_size_cm);
cb1 = colorbar('Position', [cb1_left cb1_bottom cm2norm_w(colorbar_width_cm) cb1_height]);
cb1.Label.String = 'Normierte Signalintensit\"at';
cb1.Label.Interpreter = 'latex';
cb1.Label.FontSize = 10;
cb1.Ticks = 0:0.2:1;
imgs2 = {snr_sos, snr_oar_pixel, snr_oar_block};
clim2 = [0 snr_max_50];
cmap2 = hot;
for k = 1:3
row = 1; col = k; % bottom row = row 1
left = cm2norm_w(padding_cm + (col-1)*(tile_size_cm + spacing_cm));
bottom = cm2norm_h(padding_cm + (n_rows-row)*(tile_size_cm + spacing_cm));
ax2(k) = axes('Position', [left bottom cm2norm_w(tile_size_cm) cm2norm_h(tile_size_cm)]);
imagesc(imgs2{k}, clim2);
axis image off;
colormap(ax2(k), cmap2);
title_k = titles1(k);
title(cell2str(title_k), 'FontSize', 10, 'Interpreter', 'latex', ...
'FontName', 'Latin Modern Roman');
end
cb2_left = cb1_left;
cb2_bottom = cm2norm_h(padding_cm);
cb2_height = cm2norm_h(tile_size_cm);
cb2 = colorbar('Position', [cb2_left cb2_bottom cm2norm_w(colorbar_width_cm) cb2_height]);
cb2.Label.String = '$\mathrm{SNR}$';
cb2.Label.Interpreter = 'latex';
cb2.Label.FontSize = 10;
cb2.Ticks = 0:50:snr_max_50;
export_fig('Test_Vergleich.pdf', '-pdf', '-transparent');
For professional Matlab assistance, please contact https://UndocumentedMatlab.com/consulting
Warning: You are using version 3.50 of export_fig. A newer version (3.51) is available, with the following improvements/fixes:
* Fixed: figure with non-default colormap exported with default colormap in some cases (issue #389)
A change-log of recent releases is available here; the complete change-log is included at the top of the export_fig.m file.
You can download the new version from GitHub or Matlab File Exchange, or run export_fig('-update') to install it directly.
Warning: In Matlab R2020a+ you can also use exportgraphics(hFigure,filename,'BackgroundColor','none','ContentType','vector') for simple file export, which could also improve image vectorization, solving rasterization/pixelization problems.
●
export_fig error. Please ensure: * that the function you used (/users/mss.system.zxvbr/export_fig.m) version 3.5 is from the expected location * and that you did not made a mistake in export_fig's expected input arguments * and that ghostscript is properly installed in Exporting to vector format (EPS, PDF etc.) requires the Ghostscript utility from http://ghostscript.com
Warning: Error in state of SceneNode.
String scalar or character vector must have valid interpreter syntax:
$\mathrm{SNR}$
Error using questdlg (line 71)
Creating dialog boxes that block execution is not supported when MATLAB is in a configuration that is non-interactive or disables window display.

Error in export_fig>selectUtilityPath (line 1633)
answer = questdlg(msg,utilName,'Use local installation','Go to website','Cancel','Cancel');
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error in export_fig (line 1584)
selectUtilityPath('Ghostscript',url,'Exporting to vector format (EPS, PDF etc.)');
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error in export_fig (line 517)
[imageData, alpha] = export_fig(varargin{:});
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
function s=cell2str(c)
%placeholder function to make the rest of the code run
s=cell2mat(reshape(c,1,[]));
end

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回答（1 个）

Ronit
Ronit 2025-7-16
编辑：Ronit 2025-7-16
Ran in:
Hello @Dominik,
You can replace 'cell2str' with direct access to the cell array like:
title(titles1{k}, 'FontSize', 10, 'Interpreter', 'latex', ...
'FontName', 'Latin Modern Roman');
Additionally, the function 'export_fig' is not a built-in MATLAB function, it is a third-party add-on. I would recommend using the following alternative functions:
  • 'exportgraphics': Available for MATLAB R2020a and newer versions.
exportgraphics(f, 'Test_Vergleich.pdf', 'ContentType', 'vector', 'BackgroundColor', 'none');
  • 'print': Exports figures to PDF in vector format.
print(f, 'Test_Vergleich.pdf', '-dpdf', '-vector');
After making the above changes:
img_sos = rand(64);
img_oar_pixel = rand(64);
img_oar_block = rand(64);
snr_sos = rand(64)*250;
snr_oar_pixel = rand(64)*250;
snr_oar_block = rand(64)*250;
snr_max = ceil(max([snr_sos(:); snr_oar_pixel(:); snr_oar_block(:)]));
snr_max_50 = ceil(snr_max / 50) * 50;
% Layout-Parameter
tile_size_cm = 4.0; % image size in cm
n_cols = 3;
n_rows = 2;
padding_cm = 0.8;
spacing_cm = 0.3;
colorbar_width_cm = 0.3; % colorbar width
fig_width_cm = padding_cm*2 + n_cols*tile_size_cm + (n_cols-1)*spacing_cm + colorbar_width_cm + 0.3; % extra rechts
fig_height_cm = padding_cm*2 + n_rows*tile_size_cm + (n_rows-1)*spacing_cm;
f = figure('Units', 'centimeters', ...
'Position', [5 5 fig_width_cm fig_height_cm], ...
'PaperUnits', 'centimeters', ...
'PaperSize', [fig_width_cm fig_height_cm], ...
'PaperPositionMode', 'manual', ...
'PaperPosition', [0 0 fig_width_cm fig_height_cm]);
cm2norm_w = @(x) x / fig_width_cm;
cm2norm_h = @(x) x / fig_height_cm;
imgs1 = {img_sos, img_oar_pixel, img_oar_block};
titles1 = {sprintf('Sum-of-Squares'), ...
sprintf('Adaptive Kombination\n(Pixelweise)'), ...
sprintf('Adaptive Kombination\n(Blockweise)')};
clim1 = [0 1];
cmap1 = jet;
for k = 1:3
row = 2; col = k; % upper row = row 2
left = cm2norm_w(padding_cm + (col-1)*(tile_size_cm + spacing_cm));
bottom = cm2norm_h(padding_cm + (n_rows-row)*(tile_size_cm + spacing_cm));
ax1(k) = axes('Position', [left bottom cm2norm_w(tile_size_cm) cm2norm_h(tile_size_cm)]);
imagesc(imgs1{k}, clim1);
axis image off;
colormap(ax1(k), cmap1);
end
cb1_left = cm2norm_w(padding_cm + n_cols*tile_size_cm + (n_cols-1)*spacing_cm + 0.1);
cb1_bottom = cm2norm_h(padding_cm + tile_size_cm + spacing_cm);
cb1_height = cm2norm_h(tile_size_cm);
cb1 = colorbar('Position', [cb1_left cb1_bottom cm2norm_w(colorbar_width_cm) cb1_height]);
cb1.Label.String = 'Normierte Signalintensit\"at';
cb1.Label.Interpreter = 'latex';
cb1.Label.FontSize = 10;
cb1.Ticks = 0:0.2:1;
imgs2 = {snr_sos, snr_oar_pixel, snr_oar_block};
clim2 = [0 snr_max_50];
cmap2 = hot;
for k = 1:3
row = 1; col = k; % bottom row = row 1
left = cm2norm_w(padding_cm + (col-1)*(tile_size_cm + spacing_cm));
bottom = cm2norm_h(padding_cm + (n_rows-row)*(tile_size_cm + spacing_cm));
ax2(k) = axes('Position', [left bottom cm2norm_w(tile_size_cm) cm2norm_h(tile_size_cm)]);
imagesc(imgs2{k}, clim2);
axis image off;
colormap(ax2(k), cmap2);
title(titles1{k}, 'FontSize', 10, 'Interpreter', 'latex', ...
'FontName', 'Latin Modern Roman');
end
cb2_left = cb1_left;
cb2_bottom = cm2norm_h(padding_cm);
cb2_height = cm2norm_h(tile_size_cm);
cb2 = colorbar('Position', [cb2_left cb2_bottom cm2norm_w(colorbar_width_cm) cb2_height]);
cb2.Label.String = '$\mathrm{SNR}$';
cb2.Label.Interpreter = 'latex';
cb2.Label.FontSize = 10;
cb2.Ticks = 0:50:snr_max_50;
% print(f, 'Test_Vergleich.pdf', '-dpdf', '-vector');
exportgraphics(f, 'Test_Vergleich.pdf', 'ContentType', 'vector', 'BackgroundColor','none');
Warning: Error in state of SceneNode.
String scalar or character vector must have valid interpreter syntax:
$\mathrm{SNR}$
Please refer to the following documentation pages for more information about the functions:
I hope the above recommendations help you resolve the query.

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