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John Petersen


Last seen: 4일 전

Autonomous Solutions, Inc.

171 2011 이후 총 참여 횟수

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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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 =...

5달 전 | 0

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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 ...

2년 이상 전 | 답변 수: 0 | 0

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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...

약 3년 전 | 답변 수: 1 | 0

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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...

3년 이상 전 | 답변 수: 1 | 0

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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...

3년 이상 전 | 답변 수: 2 | 1

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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...

3년 이상 전 | 답변 수: 1 | 1

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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...

4년 이하 전 | 0

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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 ...

4년 이하 전 | 답변 수: 4 | 0

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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...

4년 이상 전 | 답변 수: 5 | 0

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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...

4년 이상 전 | 답변 수: 1 | 0

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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...

4년 이상 전 | 답변 수: 2 | 1

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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 ...

4년 이상 전 | 답변 수: 2 | 0

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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...

4년 이상 전 | 답변 수: 0 | 0

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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 ...

4년 이상 전 | 답변 수: 2 | 0

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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...

4년 이상 전 | 0

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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...

4년 이상 전 | 답변 수: 1 | 0

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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...

4년 이상 전 | 0

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

약 5년 전 | 0

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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 ...

5년 이상 전 | 답변 수: 2 | 0

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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...

5년 이상 전 | 0

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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)

5년 이상 전 | 0

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Substituting a number for NaN in anonymous function
You have .*f(x) in g(x), which is still giving you a NaN

5년 이상 전 | 1

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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...

5년 이상 전 | 0

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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. ...

5년 이상 전 | 0

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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...

5년 이상 전 | 0

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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...

5년 이상 전 | 0

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"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)]);

5년 이상 전 | 1

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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); ...

5년 이상 전 | 0

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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...

5년 이상 전 | 답변 수: 1 | 0

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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.

6년 이하 전 | 0

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