Control systems engineer with PhD in EE at Autonomous Solutions and I love to ski and run trails.

Professional Interests: Control systems, Localization/Navigation, Estimation, Electronic Design, Sensor Fusion

Question

How do I change a configuration parameter for all simulink blocks in my model?

I recently upgraded to 2016b from 2015a and now I'm getting many warnings about units inconsistency. I don't use or care about ...

2 years ago | 0 answers | 0

Question

Can I index into a timeseries using time?

I have a timeseries and I want to index into the timeseries using time to get the data. Is there an elegant way or do you have t...

2 years ago | 1 answer | 0

Question

How do I control the size of a checkbox in a programmatic GUI?

I have a programmatic GUI and I'm trying to change the size of my checkboxes, but I can't get it to change. I've tried changing...

3 years ago | 1 answer | 0

Question

How to index every field of a structure and reassign to a structure with a single element in each field

I have a structure where every field is an array of the same length. I need to pass this structure on but only with a single ele...

3 years ago | 2 answers | 1

Question

How do I get my text to center vertically in a uicontrol textbox?

I am creating a GUI programmatically and I have a panel that I am displaying text boxes. How do I get my text boxes to display t...

3 years ago | 1 answer | 1

Answered

how do I print a txt file of integers and floats?

Thank you for your input and suggestions! I have finally come up with this Ad = double(A); % cast the int to a double d...

how do I print a txt file of integers and floats?

Thank you for your input and suggestions! I have finally come up with this Ad = double(A); % cast the int to a double d...

3 years ago | 0

Question

how do I print a txt file of integers and floats?

I have tried in vain to write a text file of a mix of ints and floats. Suppose I have A = nx1 ints, and B = nx1 floats I want ...

3 years ago | 4 answers | 0

Question

How do I rename fields of a structure array?

Say I have a structure array such as A = 1x49 struct array with fields: a b c d H...

4 years ago | 4 answers | 0

Question

How do I assign the same value to every field, including nested fields of a structure?

Say I have a structure which has an unknown number of fields and each field may or may not have subfields. I want to assign a ce...

4 years ago | 1 answer | 0

Question

How do I run a script from a GUI that will run in the 'base' workspace?

I have a simulink model that uses a lot of variables from the base workspace. Now I am making a GUI that runs the model, but I w...

4 years ago | 2 answers | 1

Question

Structured Cell array assignment question

If I have something like A(1).a = {c}; A(2).a = {d}; and B(1).a = {e}; B(2).a = {f}; and want to assign ...

4 years ago | 2 answers | 0

Question

xlsread doesn't recognize file has changed

I have a .xlsx file that I read with xlsread. However, if I change the file and call it with xlsread again, it returns the old v...

4 years ago | 0 answers | 0

Question

How do I make assignments to my workspace using variable names and values in a spreadsheet?

I have an excel file that has names of structures in the top row, names of fields of those structures in the 2nd row and in the ...

4 years ago | 2 answers | 0

Answered

Simulink model does not "continue" after a "pause" by using set_param commands.

Your sim stops because of the pause. When you press play, it continues for one cycle and then is told to pause again in your ass...

Simulink model does not "continue" after a "pause" by using set_param commands.

Your sim stops because of the pause. When you press play, it continues for one cycle and then is told to pause again in your ass...

4 years ago | 0

Question

Fill a listbox with the text of a set of enumerations

I have a listbox in a GUI that I want to populate using enumerations. My class of enumerations might be something like mye...

4 years ago | 1 answer | 0

Answered

Problem saving cell to txt file

The error is telling you that you can't use cells in your print function. That's because cell arrays can be different lengths, a...

Problem saving cell to txt file

The error is telling you that you can't use cells in your print function. That's because cell arrays can be different lengths, a...

4 years ago | 0

| accepted

Answered

How to use LQR and code generation?

The 'work around' is to write your own Ricatti Eq Solver.

How to use LQR and code generation?

The 'work around' is to write your own Ricatti Eq Solver.

4 years ago | 0

Question

Turn a cellarray into a single array.

I have a cell array, sig, with varying lengths of data in each cell. For example (on a simplified scale) sig = [{1}; {[2 ...

5 years ago | 2 answers | 0

Answered

How to convert step varying signal into linear signal(gradual rise and fall)>

One way to do it is to sample the step varying signal at each step and then use the result or you could fit a spline or polynomi...

How to convert step varying signal into linear signal(gradual rise and fall)>

One way to do it is to sample the step varying signal at each step and then use the result or you could fit a spline or polynomi...

5 years ago | 0

Answered

Function for Script. I need to write a Function that selects the positive and negative numbers from a matrix. How to write this?

a = 0.5 - rand(3,3); %Positive numbers a(a>=0) % negative numbers a(a>0)

Function for Script. I need to write a Function that selects the positive and negative numbers from a matrix. How to write this?

a = 0.5 - rand(3,3); %Positive numbers a(a>=0) % negative numbers a(a>0)

5 years ago | 0

Answered

Substituting a number for NaN in anonymous function

You have .*f(x) in g(x), which is still giving you a NaN

Substituting a number for NaN in anonymous function

You have .*f(x) in g(x), which is still giving you a NaN

5 years ago | 1

Answered

Solving steady state Kalman riccati equation

Just write out the equations. If it's 2x2 it shouldn't be too hard. Q and R are almost always diagonal. P is symmetric, so thes...

Solving steady state Kalman riccati equation

Just write out the equations. If it's 2x2 it shouldn't be too hard. Q and R are almost always diagonal. P is symmetric, so thes...

5 years ago | 0

Answered

Extended Kalman Filter converges to wrong values (super simple model)

You have a constant dt used in the filter, but the simulation is variable step. This will cause problems with your predictor. ...

Extended Kalman Filter converges to wrong values (super simple model)

You have a constant dt used in the filter, but the simulation is variable step. This will cause problems with your predictor. ...

5 years ago | 0

| accepted

Answered

Quadcopter PID Controller Implementation - Derivative Filter

Apply your derivative gain to the angle rate error and the proportional gain to the angle error. Angle rate error would be (des...

Quadcopter PID Controller Implementation - Derivative Filter

Apply your derivative gain to the angle rate error and the proportional gain to the angle error. Angle rate error would be (des...

5 years ago | 0

Answered

Can't see variables in workspace when run from a function

I see where you are calling the other functions, but you are ignoring the return variables. Is that the problem? What specific...

Can't see variables in workspace when run from a function

I see where you are calling the other functions, but you are ignoring the return variables. Is that the problem? What specific...

5 years ago | 0

Answered

"Hold on" function doesn't work when use set function to dynamically plot data

Try set(hp1, 'XData', [get(hp1, 'Xdata'); k], 'YData', [get(hp1,'Ydata'); c1(k,1)]);

"Hold on" function doesn't work when use set function to dynamically plot data

Try set(hp1, 'XData', [get(hp1, 'Xdata'); k], 'YData', [get(hp1,'Ydata'); c1(k,1)]);

5 years ago | 1

Answered

Filtering of data in simulink

A simple low pass filter (for scalar inputs - easily modified for vectors) is y(i) = (alpha)* y(i-1) + (1-alpha)*x(i); ...

Filtering of data in simulink

A simple low pass filter (for scalar inputs - easily modified for vectors) is y(i) = (alpha)* y(i-1) + (1-alpha)*x(i); ...

5 years ago | 0

Question

Indexing multiple values of an array of structures with a field that varies in length

I have an array of structures, A. Each structure has a field 'vec'. Each 'vec' is a vector, but the length of the vector can v...

5 years ago | 1 answer | 0

Answered

How to design LQG controller for optimal trajectory

y is obviously of dimension 3. Which element of y do you want to see? Just pick it out with a demux or bus selector.

How to design LQG controller for optimal trajectory

y is obviously of dimension 3. Which element of y do you want to see? Just pick it out with a demux or bus selector.

5 years ago | 0

Answered

Process Noise “Q” covarience matrix in a kalman filter

The measurement error is not used to update any covariance matrices in a Kalman filter.

Process Noise “Q” covarience matrix in a kalman filter

The measurement error is not used to update any covariance matrices in a Kalman filter.

5 years ago | 0