# 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)... ...

7 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...

7 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...

8 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...

8 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...

8 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...

8 years ago | 0

| accepted

Problem with the product of complex numbers

Probably |simplify(Zeq)| will do that.

8 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>

8 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 =...

8 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...

8 years ago | 6

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...

8 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 ...

9 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...

9 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...

9 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...

9 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...

9 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....

9 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));

9 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...

9 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 ...

9 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...

9 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>...

9 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...

9 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...

9 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...

9 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...

9 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;...

9 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...

9 years ago | 0