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John Petersen


Autonomous Solutions, Inc.

170 2011 年以降の合計貢献数

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

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  • 6 Month Streak
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質問


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 ...

1年以上 前 | 0 件の回答 | 0

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質問


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...

約2年 前 | 1 件の回答 | 0

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質問


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...

2年以上 前 | 1 件の回答 | 0

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質問


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...

2年以上 前 | 2 件の回答 | 1

2

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質問


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...

2年以上 前 | 1 件の回答 | 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...

約3年 前 | 0

質問


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 ...

約3年 前 | 4 件の回答 | 0

4

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質問


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...

3年以上 前 | 4 件の回答 | 0

4

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質問


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...

3年以上 前 | 1 件の回答 | 0

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質問


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...

3年以上 前 | 2 件の回答 | 1

2

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質問


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 ...

3年以上 前 | 2 件の回答 | 0

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質問


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...

3年以上 前 | 0 件の回答 | 0

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質問


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年弱 前 | 2 件の回答 | 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...

4年弱 前 | 0

質問


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年弱 前 | 1 件の回答 | 0

1

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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...

4年弱 前 | 0

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

4年以上 前 | 0

質問


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 ...

4年以上 前 | 2 件の回答 | 0

2

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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...

4年以上 前 | 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)

4年以上 前 | 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

5年弱 前 | 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...

5年弱 前 | 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. ...

5年弱 前 | 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...

5年弱 前 | 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...

5年弱 前 | 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)]);

5年弱 前 | 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); ...

5年弱 前 | 0

質問


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年弱 前 | 1 件の回答 | 0

1

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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.

約5年 前 | 0

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Process Noise “Q” covarience matrix in a kalman filter
The measurement error is not used to update any covariance matrices in a Kalman filter.

約5年 前 | 0

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