0

I am currently developing some simulations using a nonlinear model w/ feedback in MATLAB where there exist some trajectories that are unstable.

I want to export this using matlab2tikz so I can have something that looks exactly like this in my latex document:

what I want

The main issue I am having is that when try to add this .tex file to my document it produces an error where pgfplots is unsure of how to handle to nans.

\documentclass[tikz]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{grffile}
\pgfplotsset{compat=newest}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{amsmath}

\begin{document}
\begin{tikzpicture}

\begin{axis}[%
width=6.028in,
height=4.754in,
at={(1.011in,0.642in)},
scale only axis,
unbounded coords=jump,
xmin=0,
xmax=30,
ymin=-60,
ymax=60,
axis background/.style={fill=white}
]
\addplot [color=red, line width=2.0pt, forget plot]
  table[row sep=crcr]{%
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\end{axis}
\end{tikzpicture}%
\end{document}

I tried after the fact inside of MATLAB to use something like

z = find(isnan(x_rec))';
        x_rec(z) = 0;

to get rid of all nans in the vector element that's be used for the graphs. But it still generates these nan values when I run matlab2tikz. Are there any fixes inside of MATLAB/LaTeX that I can use to address this? Any input would be greatly appreciated.

EDIT1: cleared

EDIT2: added requested changes by user comments

EDIT3: I followed precisely your suggestions as stated in your answer.

I did a slightly more complicated example but without all of the trajectories to see if I could apply it to the larger case.

I get the following error output:

/Users/.../Dropbox/Flight Models/F16 MRAC/Improvments/simulations/export/lqr_case3_test.tex:820: Missing number, treated as zero. [\end{axis}] /Users/.../Dropbox/Flight Models/F16 MRAC/Improvments/simulations/export/lqr_case3_test.tex:820: Missing number, treated as zero. [\end{axis}] /Users/.../Dropbox/Flight Models/F16 MRAC/Improvments/simulations/export/lqr_case3_test.tex:820: Illegal unit of measure (pt inserted). [\end{axis}]

The code is attached:

\documentclass[tikz]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{grffile}
\pgfplotsset{compat=newest}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{amsmath}

\begin{document}
\begin{tikzpicture}

\begin{axis}[%
width=6.028in,
height=1.258in,
at={(1.011in,4.137in)},
scale only axis,
unbounded coords=jump,
xmin=0,
xmax=30,
xlabel style={font=\color{white!15!black}},
xlabel={$t$ [s]},
ymin=-10,
ymax=10,
y filter/.expression={y < -10 ? -10 : y},
ytick = {-60,-40,-20,0,20,40,60},
xtick= {0,5,10,15,20,25,30},
ylabel style={font=\color{white!15!black}},
ylabel={$\mathrm{e}_\mathrm{y}(t)$},
axis background/.style={fill=white}
]
\addplot [color=red, line width=2.0pt, forget plot]
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0.895   9.38393270887029\\
0.91    10.0927552846908\\
nan nan\\
3.66500026922157    12\\
3.66500031753162    -12.0000000004657\\
nan nan\\
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};
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\end{axis}
\end{tikzpicture}
\end{document}
9
  • Welcome ! I'm pretty sure **nan nan** shoud be replaced with NaN NaN
    – BambOo
    Commented Nov 7, 2018 at 12:17
  • Could you please add the complete code provided by matlab2tikz
    – BambOo
    Commented Nov 7, 2018 at 12:19
  • The code is lengthy is so I have included a pastebin link which you can please find attached: pastebin.com/ebHja1qy
    – drw5ff
    Commented Nov 7, 2018 at 12:36
  • matlab2tikz is definitely exporting nan values as "nan" and not "NaN"
    – drw5ff
    Commented Nov 7, 2018 at 12:36
  • My bad, I only meant there chould be no ** but you're right
    – BambOo
    Commented Nov 7, 2018 at 12:45

1 Answer 1

1

I cannot reproduce your error on my computer, but regarding the output you need, you can add and y filter option to your axis environment. This will apply some code to any y value of your dataset. See pgfplots manual section 4.22 p386.

In your case, the expression y filter/.expression={y < -60 ? -60 : y} checks if the y value of a data point is below -60 if yes it changes the values to -60 if not, it keeps its initial value.

In general, in graphics rendering softwares, nan are used to make stuff invisible while keeping good object dimensions, in your case, two column matrices.

\documentclass[tikz,border=3.14mm]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{grffile}
\pgfplotsset{compat=newest}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{amsmath}

\begin{document}
\begin{tikzpicture}

\begin{axis}[%
width=6.028in,
height=4.754in,
at={(1.011in,0.642in)},
scale only axis,
%unbounded coords=jump,
xmin=0,
xmax=30,
ymin=-60,
ymax=60,
y filter/.expression={y < -60 ? -60 : y},
ytick = {-60,-40,-20,0,20,40,60},
xtick= {0,5,10,15,20,25,30},
axis background/.style={fill=white}
]
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0   -5.90295810358706e+20\\
0   0\\
};
\end{axis}
\end{tikzpicture}%
\end{document}

enter image description here Update related to OP EDIT3

I simplified your MWE by removing all parts not related to the error you point out, and modified the flter criterion with y filter/.expression={abs(y) > 10 ? sign(y)*10 : y} so that any value too larg (absolute value above 10) is set to +-10, which solves the error due to this y value 562949953421312.

To conclude my answer, there is no issue with nan values, rather with large numerical values, which is totally normal.

\documentclass[tikz]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{grffile}
\pgfplotsset{compat=newest}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{amsmath}

\begin{document}
\begin{tikzpicture}

\begin{axis}[%
width=6.028in,
height=1.258in,
at={(1.011in,4.137in)},
scale only axis,
unbounded coords=jump,
xmin=0,
xmax=30,
xlabel style={font=\color{white!15!black}},
xlabel={$t$ [s]},
ymin=-10,
ymax=10,
y filter/.expression={abs(y) > 10 ? sign(y)*10 : y},
ytick = {-60,-40,-20,0,20,40,60},
xtick= {0,5,10,15,20,25,30},
ylabel style={font=\color{white!15!black}},
ylabel={$\mathrm{e}_\mathrm{y}(t)$},
axis background/.style={fill=white}
]
\addplot [color=red, line width=2.0pt, forget plot]
  table[row sep=crcr]{%
0   -0.125\\
0.25    -3.125\\
0.5 -5\\
0.625   -6\\
0.75    -6.625\\
1   -7\\
1.125   -7.125\\
1.25    -7.125\\
1.375   -7\\
1.5 -6.75\\
1.625   -6.25\\
1.875   -5.5\\
2   -4.5\\
2.25    -3.25\\
2.375   -1.875\\
2.5 -0.25\\
2.5 4.25\\
2.625   10.125\\
nan nan\\
5.375   12\\
5.375   -12\\
nan nan\\
5.375   -12\\
5.375   562949953421312\\
5.375   0\\
};

\end{axis}
\end{tikzpicture}
\end{document}

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