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John Petersen


Autonomous Solutions, Inc.

Last seen: 1 year ago |  Active since 2011

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Control systems engineer with PhD in EE at Autonomous Solutions and I love to ski, run and bike trails. Professional Interests: Control systems, Localization/Navigation, Estimation, Electronic Design, Sensor Fusion

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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

1 year ago

Question


Can I parse a text file with dates and data using readmatrix or readtable?
I have used textscan for most of my parsing, but I want to try using readmatrix or readtable with hopes that it will be simpler....

2 years ago | 2 answers | 0

2

answers

Question


How to convert all of a structures fields into strings that represent the complete names.
I have a structure of variable numbers of fields. I want to display them on a GUI so that they can be changed by a user. So I w...

2 years ago | 2 answers | 0

2

answers

Question


How can I determine where or if a bus is used in a simulink model?
I have a complex simulink model that has dozens of busses defined. Some busses are identical but with different names. I have f...

3 years ago | 1 answer | 0

1

answer

Question


How to convert a layered structure into arrays.
I have a structure like this A.a.b.first, A.a.b.second, A.a.b.third A.c.d.first, A.c.d.second, A.c.d.third A.e.f.first, A.e.f...

3 years ago | 2 answers | 0

2

answers

Question


Variable Not fully defined on some execution path error
I have some code that is inside a simulink block that gets an error when it's compiled. It says a variable is not fully defined ...

3 years ago | 1 answer | 0

1

answer

Question


How do I plot the progress of fmincon to see the convergence of the approximation?
I want to see the output at each iteration of the optimization. I am solving for MPC and want to plot the entire future solution...

4 years ago | 0 answers | 0

0

answers

Answered
Does a single nodelocked license file support multiple matlab versions
Yes, this is possible. See https://www.mathworks.com/matlabcentral/answers/99348-is-it-possible-to-have-multiple-releases-of-...

4 years ago | 0

Answered
Error using cd Cannot CD to 7364 (Name is nonexistent or not a directory).
You are changing directories in the first for loop so that by the time you get in to the second for loop you are not starting in...

4 years ago | 0

Answered
How to keep the slider position the same after retrieving its value?
It's not a great idea to be using any globals in here. My guess is that roadA has the value of 5 and that's why slider_input =...

4 years ago | 0

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 ...

6 years ago | 0 answers | 0

0

answers

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...

7 years ago | 1 answer | 0

1

answer

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...

7 years ago | 1 answer | 0

1

answer

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...

7 years ago | 3 answers | 1

3

answers

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...

7 years ago | 1 answer | 1

1

answer

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...

8 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 ...

8 years ago | 5 answers | 0

5

answers

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...

8 years ago | 8 answers | 1

8

answers

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...

8 years ago | 1 answer | 0

1

answer

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...

8 years ago | 2 answers | 1

2

answers

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 ...

9 years ago | 2 answers | 0

2

answers

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...

9 years ago | 0 answers | 0

0

answers

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 ...

9 years ago | 2 answers | 0

2

answers

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...

9 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...

9 years ago | 1 answer | 0

1

answer

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...

9 years ago | 0

| accepted

Answered
How to use LQR and code generation?
The 'work around' is to write your own Ricatti Eq Solver.

9 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 ...

9 years ago | 2 answers | 0

2

answers

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...

10 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)

10 years ago | 0

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