How to print a figure as a PDF, that has the same size of my figure (or, how to resize the PDF according to my figure dimensions)?

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Sim
Sim 2023-3-6
编辑： Sim 2023-3-7
How to print a figure as a PDF, that has the same size of my figure (or, how to resize the PDF according to my figure dimensions)?
In other words, how can I get rid of the upper and lower white margins in the following printed PDF?
(here following I tried to use the method/solution proposed by Sergi Tarroc on 17 Jun 2021)
% create a figure with "subtightplot"
subplot = @(m,n,p) subtightplot (m, n, p, [0.001 0], [0.01 0.01], [0.01 0.01]);
fig = figure('position',[700 100 700 1200],'Color',[1 1 1])
hold on
for i = 1 : 6
subplot(2,3,i);
end
hold off
% print the figure as PDF
fig.Units = 'centimeters'; % set figure units to cm
fig.PaperUnits = 'centimeters'; % set pdf printing paper units to cm
fig.PaperSize = fig.Position(3:4); % assign to the pdf printing paper the size of the figure
path = ( '/Users/Donald/.../' ); % where to print my figure
print (fig(:), '-dpdf','-loose','-opengl','-r600', [path, 'fig'] )
This is the resulting PDF, where you can clearly see the upper and lower white margins that I would like to get rid of:
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Sim
Sim 2023-3-7
编辑：Sim 2023-3-7
Thanks a lot! Yes, that solution works! Sorry for asking something similar to my old post - Maybe I can delete this question (if Matlab moderators/staff thinks it is better)

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Sim
Sim 2023-3-7
编辑：Sim 2023-3-7
Solved, thanks to the @Luca Ferro's comment (Yes, similar to my old post - and sorry for asking something similar, I did not realise I could use the same solution, my fault)...Many thanks @Luca Ferro!!
Just the exportgraphics function solves my issue:
% Solution:
% create a figure with "subtightplot"
subplot = @(m,n,p) subtightplot (m, n, p, [0.001 0], [0.01 0.01], [0.01 0.01]);
fig = figure('position',[700 100 700 1200],'Color',[1 1 1])
hold on
for i = 1 : 6
subplot(2,3,i);
end
hold off
% print the figure as PDF
path = ( '/Users/Donald/.../' ); % where to print my figure
exportgraphics(fig, fullfile(path, 'fig.pdf'),'ContentType','vector') % this solves my issue
And this is the resulting PDF, without the upper and lower white margins:
At this point, I do not know if the following commands that I have used (by following the method/solution proposed by Sergi Tarroc on 17 Jun 2021) are really necessary, maybe no, or at least I do not see differences:
fig.Units = 'centimeters'; % set figure units to cm
fig.PaperUnits = 'centimeters'; % set pdf printing paper units to cm
fig.PaperSize = fig.Position(3:4); % assign to the pdf printing paper the size of the figure

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