# Jonathan LeSage

### MathWorks

In my spare time, I love exploring the world and working on my home culinary abilities, including pasta making and home brewing.

By day, I am a Senior Application Engineer at the MathWorks with a background in power systems and controls engineering. I travel to work with our customers on modeling/simulation applications and predictive maintenance.

Professional Interests: Controls, estimation, machine learning, mobile robotics, energy storage technologies, batteries, power systems

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**Content Feed**

How do I combine multiple plots in a for loop?

Add “hold on” prior to your for-loop. Adding a "hold on" command means that anything that you plot will not clear the existing...

3 years ago | 4

| accepted

op-amp inverter on simulink

I took a look at the example model that you attached to your question. I saw what you mean by the square pulse does not start at...

6 years ago | 1

Help on gmdistributionfit toolbox

When you plot the |gmdistribution| fit results, did you remember to pass in both the x and y arguments to the |plot| function? ...

8 years ago | 0

why am I getting this linprog error ?

You should check the dimensions of both your 'f' vector and your 'Aeq' matrix. Both of these values are multiplied with the vect...

8 years ago | 0

The Integration of Gaussian PDF to obtain the CDF why don’t I get the correct answer?

After reviewing your code, I was able to figure out what was troubling you. The flow of your code and equations are all correct,...

8 years ago | 1

| accepted

How do I pass variables from one GUI to another

You can use the |<http://www.mathworks.com/help/matlab/ref/setappdata.html setappdata>| and |<http://www.mathworks.com/help/matl...

8 years ago | 12

| accepted

Look-up table with changing table

From what you are describing as requirements, you are correct that you need to use the <http://www.mathworks.com/help/simulink/s...

8 years ago | 1

| accepted

to find rise time, settling time, overshoot, steady-state error by a model generated in Simulink ?

I am assuming that you're already providing a step input to your Simulink model via the <http://www.mathworks.com/help/simulink/...

8 years ago | 0

Fitting exponential function, coefficients and errors

You have quite a few options that you might want to check out to improve your exponential fit! As an option within the |fit| fun...

8 years ago | 0

| accepted

How can i open SimPowersystems library in R2013b?

The Simulink component library, SimPowerSystems, is an additional package for use in the Simscape environment. You can check the...

8 years ago | 0

Need help using ODE45 and eulers function

It looks to me that you're nearly there! I found a couple of small mistakes that seems to be holding you back. Changes to you...

8 years ago | 2

how to update the value of a transfer function block during run time of simulation

Here is a link to some documentation that details several different methods in Simulink to achieve what you're looking for: *...

8 years ago | 0

Find Triggered subsystem in a simulink model

One potential method would be to generate a list of all the blocks in your Simulink model, and then find blocks which are of the...

8 years ago | 0

| accepted

How to set y-axes intercept

You can set the limits of the x-axis directly using the |<http://www.mathworks.com/help/matlab/ref/xlim.html xlim>| function. If...

8 years ago | 0

| accepted

How can I perform a K-means cluster analysis of the data inside a cell array?

The documentation of the |<http://www.mathworks.com/help/stats/kmeans.html kmeans>| function that you are trying to use requires...

8 years ago | 0

| accepted

Define colormap according to certain variable.

You can define a colormap using the |<http://www.mathworks.com/help/matlab/ref/colormap.html hsv>| function and then define the ...

8 years ago | 1

Comparison between two stairs graphs

Since you're interested in the values of the empirical CDF curves, you could use the |ecdf| function as opposed to |cdfplot|. Th...

8 years ago | 0

Estimation of parameters for a non-linear model

If you're using MATLAB 2011b or newer, you likely have access to the <http://www.mathworks.com/help/curvefit/interactive-curve-a...

8 years ago | 0

| accepted

How to put a title on a colorbar?

Using the handle for the colorbar (in your case, the variable hcb), you can locate the colorbar handle title using the |get| fun...

8 years ago | 2

| accepted

Poker bar graph, probability

An interesting problem for sure, as there are many methods through which you could tackle this problem. If you're relatively new...

8 years ago | 1

| accepted

How can I overlay a google earth image with a quiver plot?

If you have a map image of your area of interest, you could plot and scale the map coordinates using the |<http://www.mathworks....

8 years ago | 1

| accepted

dB scale (log scale) of a polar plot graph

You can simply convert the results directly to the decibels scale and plot the transformed results using the |polar| function. I...

8 years ago | 0

FFT Power units for a time series?

Commonly, you can express the y-axis units in terms of power/frequency. If you use the logarithmic decibel scale, the units of y...

8 years ago | 0

FPLOT, how to define step size along X-axis?

To define your own points, you could just use the |<http://www.mathworks.com/help/matlab/ref/feval.html feval>| function. You co...

8 years ago | 2

| accepted

Solving for unknown iteratively, guess and check

Perhaps a better way of formulating the problem is to solve for the zeros of the nonlinear function. F - a*(b*sqrt(c*(1 - x/d...

8 years ago | 0

Plotyy Display Gridlines Axis

You can select the second axis handle for the data plotted with respect to the right y-axis. If you define an output for the |pl...

8 years ago | 1

| accepted

How can I use MATLAB in image processing?

You can start here: <http://www.mathworks.com/products/image/examples.html>

8 years ago | 0

How count pulse when go up in simulink?

One potential method for counting pulses is to use the <http://www.mathworks.com/help/simulink/slref/detectincrease.html Detect ...

8 years ago | 2

| accepted

How can I convert a transfer function into time dependent using ilaplace

The |<http://www.mathworks.com/help/symbolic/ilaplace.html ilaplace>| function works on *symbolic expressions* and not transfer ...

8 years ago | 0

Plotting temperature contours from txt file

To help you get started, I found some examples in the documentation about interpolation of data using the |scatteredInterpolant|...

8 years ago | 0