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MATLAB figures don't have the same size when inserted in LaTeX (Although produced using the same code)

I am producing some figures in MATLAB and try to insert them in LaTeX. However, when I do so, they usually don't have the same size (although I am using the same setup to produce them).

For example:

enter image description here

The MATLAB code I am currently using is this one

lsize = 16; % Label fontsize
nsize = 16; % Axis fontsize

q=randn(100,1000);

a1=linspace(1,1000,1000);
b1=linspace(2,2000,1000);


figure (1)

histogram(q)

xlabel('Time [sec]','Fontsize', lsize)
ylabel('W_{kin} [keV]','Fontsize', lsize)

set(gca, 'Fontsize', nsize)
set(gcf,'paperpositionmode','auto');
set(gcf,'windowstyle','normal');
set(gca,'LooseInset',max(get(gca,'TightInset'), 0.02))
set(gca,'fontweight','normal')


opts.Colors     = get(groot,'defaultAxesColorOrder');
opts.saveFolder = 'img/';
opts.width      = 12;
opts.height     = 10;
opts.fontType   = 'Times';

saveas(gcf,'f1.png')

figure(2)

loglog(a1,b1)
xlabel('time [sec]','Fontsize', lsize)
ylabel('Speed [m/sec]','Fontsize', lsize)

set(gca, 'Fontsize', nsize)
set(gcf,'paperpositionmode','auto');
set(gcf,'windowstyle','normal');
set(gca,'LooseInset',max(get(gca,'TightInset'), 0.02))
set(gca,'fontweight','normal')


opts.Colors     = get(groot,'defaultAxesColorOrder');
opts.saveFolder = 'img/';
opts.width      = 12;
opts.height     = 10;
opts.fontType   = 'Times';

saveas(gcf,'f2.png')

The latex code I am using is:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}   % needed for figures

\begin{document}

\begin{figure}[!ht]
     \begin{center}

         \includegraphics[width=0.3\textwidth]{f2.png}\\ 

         \includegraphics[width=0.3\textwidth]{f1.png}


     \caption {A caption}\label{A_label}
     \end{center}
     \end{figure}

\end{document}

Am I doing something wrong?

Solution

  • I had a similar issue when trying to plot massive data in LaTeX (which it is not made for) so I wanted to draw the figures in MATLAB and arrange them (and the axes) in LaTeX. So I printed them as PDFs.

    The trick to always meet the exact figure sizes is to make the axes fill the whole figure with set(gca,'position',[0 0 1 1]). You will need to draw the axes, ticks, and labels in LaTeX (remember to use the option axis on top in pgfplots there).

    function printFig2PDF(fh,FigName,FigWidth,FigHeight)
%% export MATLAB-figure as PDF

Format = 'pdf';

% check if input name has an extension
lst = strsplit(FigName,'.');
if ~strcmpi(lst{end},Format)
    % append format
    FigName = strcat(FigName,'.',lower(Format));
end

%% adjust figure
if ~isempty(fh.ax.Legend)
    fh.ax.Legend.Visible = 'off';
end
fh.ax.Box = 'off';
set(    fh.ax, 'YTickLabel',{},'XTickLabel',{});
set(    fh.ax, 'yColor','none','xColor','none');


set(fh.ax, 'Position',[0 0 1 1])

set(fh.fig, 'PaperUnits','centimeters',...
        'PaperPosition',[0 0 FigWidth FigHeight],...
        'PaperSize',[FigWidth FigHeight]);

% save as PDF
print(fh.fig,FigName,'-dpdf')
% close figure handle
close(fh.fig)
end

    Note that I assume that the first input (fh) is a struct with the fields fig which as a figure handle and ax which contains an axes handle (which is how I store those handles if I have multiple figures and subplots). If you want to plot the current figure with only one axes, you can create it with

    fh = struct('fig',gcf, 'ax',gca);