I would write my xlabel with Latec character so I used this code
x = -10:0.1:10;
y = [sin(x); cos(x)];
plot(x,y)
xlabel('$\mathbb{x}$','Interpreter','latex')
but I have this warning message
Warning: Error updating Text.
String scalar or character vector must have valid interpreter syntax:
$\mathbb{x}$
and the xlabel appear like this
https://i.stack.imgur.com/NCI4n.png
please how I can fix this problem.
The problem with your example is the mathbb command, which is not in base Latex. To show this, replace the \mathbb with, e.g., \mathrm. This will work.
I've never seen an example of adding Latex packages into the Matlab environment. (Update below)
You can have a look at this question, which includes a very aggressive potential way to add the package you need. But it's not clear to me if the solution proposed is actually functional.
How do you use the LaTeX blackboard font in MATLAB?
Related
So here's my code:
set(groot, 'defaultAxesTickLabelInterpreter', 'latex') %For axes;
ax = gca;
yticklabels(ax, strrep(yticklabels(ax),'--','–'));
set(ax,'ticklabelinterpreter','tex') %or 'tex' but not 'latex'
figure(1)
t= [0:0.01:2*pi];
x = sin(t);
y = cos(t)
plot(t, x, t, y)
Output:
I tried the solution here, but the hyphens still remain there. I want the en-dash to appear because it's the standard sign for the negative sign. What is the correct way of getting an en-dash to appear instead of the hyphen?
This post at MATLAB Answers explains how to set the (default) interpreter for the axes' labels.
set(groot,'defaultAxesTickLabelInterpreter','latex');
You need to call this before plotting.
Having this set, the tick-labels will be interpreted as LaTeX code. Here is a comparison. The last two examples includes #XiangruiLi's answer (the next code snippets must be called after the plot was created):
yticklabels(gca, strrep(yticklabels(gca),'-','--'));
yticklabels(gca, strrep(yticklabels(gca),'-','$-$'));
none:
latex:
latex + strrep(...,'-','--')):
latex + strrep(...,'-','$-$')):
While the last is probably what you wanted, note that this is certainly not the representation MATLAB intended. It is therefore the question if you really need/want to go through this fuzz.
It seems to me you mis-used strrep. This worked for me:
yticklabels(ax, strrep(yticklabels(ax),'-','--'));
Using the actual Unicode minus character should also work (also in Octave):
yticklabels(gca, strrep(yticklabels(gca),'-','−'));
In this case, there is no need to set the interpreter to LaTeX.
I want the xlabel of my Matlab figure to read v / Uinf, where the v has an overbar, and the inf is a symbol in subscript.
The line:
xlabel('$\bar{v}$','interpreter','latex')
creates the v overbar, and:
xlabel('U_\infty')
creates the U subscript infinity, but when I try to put them together, Matlab says 'String must have valid interpreter syntax'. It seems setting the interpreter to latex means the U_\infty command doesn't work any more.
Is there a way of writing U_infty that is compatible with latex or another way of writing the two together?
Thanks in advance,
Holly
In LaTeX, U_\infty works only in math mode, so you have to write $U_\infty$ instead.
I want to include Matlab figures into latex preferably with vectorised formats but with LaTeX MATLAB fonts for all text. I have been using the MATLAB function matlab2tikz which worked perfect for simple figures, but now my figures have too many data points which cause an error. So matlab2tikz is not suitable.
I've been looking at matlabfrag which I think will accomplish what I want, but when I run the script in LaTeX as detailed by the user guide it has an error File not found.
This is my code:
\documentclass{article}
\usepackage{pstool}
\begin{document}
\psfragfig{FileName}
\end{document}
Where FileName is the name of the .eps and .tex that matlabfrag creates. Has anyone come across this problem? Or recommend any other functions/methods to use?
I'm using Texmaker on Windows 7.
My advice would be to rethink your workflow.
Instead of reusing your Matlab code to plot figures and be dissappointed by ever changing outputs with matlab2tikz, start reusing your latex code to plot figures and don't bother about plotting in Matlab anymore (at least not for beautiful plots).
matlab2tikz is just generating latex code based on the latex-package pgfplots. To understand the working of this package is pretty easy, as it is intended to be similar to Matlab.
So why bother and always let matlab2tikz do the work for you? Because again and again you won't be entirely happy with the results. Just try to write the pgfplots-code from scratch and just load the data from Matlab.
Here is a convenient function I wrote to create latex-ready text files:
function output = saveData( filename, header, varargin )
in = varargin;
numCols = numel(in);
if all(cellfun(#isvector, in))
maxLength = max(cellfun(#numel, in));
output = cell2mat(cellfun(#(x) [x(:); NaN(maxLength - numel(x) + 1,1)],in,'uni',0));
fid = fopen(filename, 'w');
fprintf(fid, [repmat('%s\t',1,numCols),'\r\n'], header{:});
fclose(fid);
dlmwrite(filename,output,'-append','delimiter','\t','precision','%.6f','newline', 'pc');
else
disp('saveData: only vector inputs allowed')
end
end
Which could for example look like the following, in case of a bode diagram:
w G0_mag G0_phase GF_mag GF_phase
10.000000 40.865743 -169.818991 0.077716 -0.092491
10.309866 40.345290 -169.511901 0.082456 -0.101188
10.629333 39.825421 -169.196073 0.087474 -0.110690
10.958700 39.306171 -168.871307 0.092787 -0.121071
11.298273 38.787575 -168.537404 0.098411 -0.132411
In your tikzpicture you can then just load that file by
\pgfplotstableread[skip first n=1]{mydata.txt}\mydata
and store the table into the variable \mydata.
Now check pfgplots how to plot your data. You will find the basic plot command \addplot
\addplot table [x expr= \thisrowno{0}, y expr= \thisrowno{3} ] from \mydata;
where you directly access the columns of your text file by \thisrowno{0} (confusing, I know).
Regarding your problem with to many data points: pgfplots offers the key each nth point={ ... } to speed things up. But I'd rather filter/decimate the data already in Matlab.
The other way around is also possible, if you have to few data points the key smooth smoothes things up.
In MatLab (R2015a), I want to style the title of my plots using latex.
This is working fine for some functions, but not if there's a power in the equation.
The below code works, and shows a formatted title to the right, and an unformatted title to the left.
It shows the warning:
Warning: Error updating Text.
String must have valid interpreter syntax: y = x^2
syms x y
eq = y == x^2;
subplot(1,2,1)
ezplot(eq)
title(latex(eq),'interpreter','latex')
eq = y == x+2;
subplot(1,2,2)
ezplot(eq)
title(latex(eq),'interpreter','latex')
EDIT:
I just found out I can get it to work by appending $ on both sides. But it seems weird that I would have to do this.
So this works:
title(strcat('$',latex(eq),'$'),'interpreter','latex')
Solution
The problem can be solved easily by adding $-signs before and after the generated LaTeX-expression. So you can change your «title-lines» to:
title(['$',latex(eq),'$'],'interpreter','latex')
An alternative is to use strcat as proposed in your question.
Explanation
Since you basically answered the question yourself already, I'm going to explain why it happened. Hopefully after reading this, it's no longer 'weird' behaviour. If you choose to use the LaTeX-interpreter in Matlab, you really get a LaTeX-interpreter. This means that the provided string must be valid LaTeX-syntax.
Using ^ outside a math-environment is considered invalid syntax because it is a reserved character in LaTeX. Some interpreters automatically add the $ before and after in this case, but throw a warning at the same time.
The output of the latex-function in Matlab is provided without the $-signs. This way you can combine outputs and concatenate if needed without creating a mess with $-signs.
To change to the math-environment in LaTeX you can use the already mentioned shortcut $...$. An alternative way is to use \begin{math} your_equation \end{math}. It produces the same result for your equations and can be used here for demonstration purposes. The following line would do the same job, but is a bit longer to write:
title(['\begin{math}',latex(eq),'\end{math}'],'interpreter','latex')
Now, the reason why only one of your equations is displayed correctly, lies in the invalid character ^ in y = x^2. Matlab then chooses interpreter none and therefore displays the string unformatted. The +-sign in y = x + 2 is valid outside a math-environment, so it gets displayed correctly (but is not interpreted in a math-environment).
Not that significant, but annoying to no end. Why does matlab has no small phi (\varphi) symbol ? It has pretty much all other symbols LaTeX offers, but not this one. Why ?
I may be wrong of course, in which case would be delighted if someone could prove me wrong...
The default interpreter is TeX actually, not LaTeX, which is why you're having this problem. You can use LaTeX as the interpreter for a given part doing something like this:
plot(1);
hl = legend('$$\varphi$$');
set(hl,'Interpreter','latex')
or you can set LaTeX as your default interpretor using
set(0,'DefaultTextInterpreter', 'latex');
which can be put in your startup.m file if you like.
Matlab uses TeX as default. Often, it is possible to switch to LaTeX, but in some cases (dialog boxes), this is impossible.
%# here's an example with all three phis
plot(rand(3))
yh = get(gca,'YLabel');
set(yh,'Interpreter','latex','string','$\varphi$ $\phi$ $\Phi$')