# Jonathan Epperl

Professional Interests: Control Theory, Dynamical Systems, Thermoacoustics

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**Content Feed**

" requested the Runtime to terminate it in an unusual way"

Gave it another try, this time with Matlab 2013b and Virtu MVP Pro Core: 3.0.109.29300 (The newest version at the moment)... ...

9 years ago | 0

Question

Copying option structs by value instead of reference

Here is an example using |bodeoptions|, but this is probably a much more basic problem: % Create a struct with default valu...

9 years ago | 2 answers | 2

### 2

answersMulti-dimensional State-Space model in Simulink

If you have the state-space description of you 3 |x| 3 system, why don't you just enter it into the parameters of the state-spac...

10 years ago | 0

Subplot titiles in one command

Collect your titles in a cell array: titles = {'One','two','three'; 'Eins', 'Zwei', 'Drei'; 'Ichi', 'ni', 'san'} or what...

10 years ago | 2

| accepted

How to add figure title and axes labels for multiple plots?

Whatever you want to have on every axis, just move it inside the |for| loop, like so % if true % what is the point of this...

10 years ago | 2

| accepted

ODE for system of non linear, second order differential equations

I'm not entirely sure I understand your notation, but assuming by |dx5| you mean the first derivative of |x5|, and by |ddx5| you...

10 years ago | 0

| accepted

Problem with the product of complex numbers

Probably |simplify(Zeq)| will do that.

11 years ago | 0

| accepted

How to establish all possible combinations of 4 variables out of 6 ?

Sounds like you are looking for |nchoosek|: <http://www.mathworks.com/help/matlab/ref/nchoosek.html>

11 years ago | 0

| accepted

changing the axis of a plot in a way that the data series starts at x=0 at a point at one point on the y-axis and ends on the right end of the plot

This is still not a working example, the variable |VIXdate| is obviously unknown to us... So the dirty way again: ytix =...

11 years ago | 0

| accepted

How to look at the source code for MATLAB's built-in sort function?

If the source code is available, then edit sort will do the job. I can't check right now, but you go ahead and try tha...

11 years ago | 6

| accepted

changing the axis of a plot in a way that the data series starts at x=0 at a point at one point on the y-axis and ends on the right end of the plot

axis tight

11 years ago | 0

Evaluate a function in a grid

Does that code run for you? I'm sure it doesn't, you should have mentioned that, along with the error messages... Anyway, the...

11 years ago | 0

how to zoom in on specific overlapped data points and keepin the others ones inside the grid range

Okay, either you're not explaining well, or the solution is very simple: If the data doesn't have the same dimension, then make ...

11 years ago | 0

How to plot node numbers using matrix of nodes's coordinates?

And |text()| doesn't give you the results you'd like? E.g. k = 1:30; [B,XY] = bucky; gplot(B(k,k),XY(k,:),'-o') axis squ...

11 years ago | 1

| accepted

removing blackness in ribbon plot

The black regions you are seeing are the gridlines along the 678 rows of your matrix. My suggestions: Save the handles to the...

11 years ago | 1

| accepted

Exporting matrix into an Excel file

From the documentation on |xlswrite|: _A — Data to write matrix | cell array_ _Data to write, specified as a two-dimension...

11 years ago | 0

Plot 2 arrays in matlab?

You need to sort you |a| array, then permute |b| the same way. Concretely: help sort % Then you'll understand why: [a...

11 years ago | 1

| accepted

Grouping Plot and Fill in Same legend object

Okay, I hope, this helps you: % -- generate some dummy data t = linspace(0,1); s1 = sin(5*t); s2 = 3-cos(5*t); s3 = s1....

11 years ago | 2

| accepted

What is a function that takes the diagonal of a matrix (N) and converts the diagonal to all zeros.

Assuming |m| is square (because else you'd have to define the diagonal for me): diagzero = @(m) m - diag(diag(m));

11 years ago | 0

Text in 3D plot

How about adding a few whitespaces to your string, like so: text(x1(i,1),y1(i,1),z1(i,1),[' ' ... num2str(time(i,1))],'H...

11 years ago | 0

| accepted

How to plot this 3d graph?

Plot the whole graph with |mesh| or |surf|, then |hold on|, then use |plot3| to plot the lines you'd like to emphasize: x ...

11 years ago | 0

| accepted

Anonymous functions not acting as they should?

I think the mistake happens here: fmacexp=@(x,n) macexp(n)+((x^n)/factorial(n)); The value of |macexp| is now "hardwired...

11 years ago | 1

| accepted

best way to include mesh plot in latex

Here's what I do: I export the figure with |export_fig| ( <http://www.mathworks.com/matlabcentral/fileexchange/23629-exportfig>...

11 years ago | 0

| accepted

Output a square wave with tuneable frequency and phase delay

Showing us some of your prior attempts would certainly help, since we then could avoid suggesting stuff you already tried. An...

11 years ago | 0

Making a magic square matrix singular

The row-sum, column-sum and diag-sum of a magic square are all the same, and the magic square uses all the integeres |1:n^2|. Th...

11 years ago | 2

Why doesn't "solve" work on my MLab(student)

Because your version of Matlab does not include the Symbolic Math Toolbox. ver and you'll be shown all installed toolbo...

11 years ago | 0

| accepted

Taking a derivative of a function and plotting it over a specified length

Are you assigning the variable |x| before you call |syms x|? Probably, and that's probably the problem. If you really want fu...

11 years ago | 0

Add world map background to contour plot

I hope you're still interested in an answer to this question, here's what I can offer: lon = 30:2.5:150; lat = 55:-2.5:-5;...

11 years ago | 1

| accepted

how to remove from all fields in the same position of a struct?

What you did should work, my only idea about a possible error: are your |samples| "fat" or "tall"? If they are fat, i.e. |n| col...

11 years ago | 0