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Jim Riggs


Missile Defense Agency - Advanced Technology Group

Last seen: Today |  Active since 2017

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Developing simulations for the Missile Defense Agency - Advanced Technology group. 30+ years experience in missiles, smart munitions and other aerodynamic systems.

Programming Languages:
Python, C++, C, MATLAB, Fortran

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Answered
Attempting to perform the Runge-Kutta-Fehlberg Algorithm
I found the error indicated below. Note that your notation makes your code much harder to verify because you have separated th...

4 hours ago | 0

Answered
Simulation of UAV trajectory results in discontinuity in measurements
The discontinuities that you see in the trajectory data are, in fact, realistic, and correspond to command inputs. These happen...

3 days ago | 0

Answered
Error using plot Vectors must be the same length. [line 29 ERROR]
The two arguments to the 'plot' command must be the same size, e.g. 'liquidmoleFractionA' must have the same length as 'T'. A g...

11 days ago | 0

Answered
Seconds, minutes or hours for year-long SIMULINK simulation?
There is a great risk of somthing going wrong if you use anything other than seconds in a physics model, since, as you pointed o...

2 months ago | 1

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Answered
How to initialise Goto variables used in enabled subsystems
You should not need to "initialize" the Goto variables. The "Goto / from" blocks are simply a way to connect a signal without s...

2 months ago | 0

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Answered
I need help writing a function with one input and one output
The syntax for defining a function is: function steps_made_sucessfully = walk(commanded_steps) % insert your code here % ... ...

3 months ago | 0

Answered
Generate look angles between aircraft and satellite
I don't think that you will find this exact problem solution in the Aerospace toolbox, but it does contain some functions that y...

3 months ago | 0

Answered
Simulink generate input at begining of simulations
I am not sure that I understand your specific question (i.e. the implementation you are describing). The way it sounds to me, y...

3 months ago | 0

Answered
How to create equation with time instant in simulink work space
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3 months ago | 0

Answered
Not able to Understand Code for "Volume of Solid by Revolution"
[X,Y,Z] = cylinder(fx(xivals)-yr,100); Creates a set of 3D points that define a cylinder figure('Position',[700 200 560 420])...

3 months ago | 0

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Answered
Why should I use operation blocks instead of a quicker function block in simulink?
You might want to check out this documentation on Comparison of Custom Block Functionality. It references some limitations on M...

3 months ago | 0

Answered
How to save a data in another folder?
I like to define a string defining the work folder; e.g. workfolder = 'C:/user/JR/projectName/' save([workfolder 's1.mat'], ...

3 months ago | 0

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Answered
How to run a for loop one at a time with each button click?
At the end of your "for" loop, add a "while" loop that looks for the button value. if i < 3 (you don't want it to pause the l...

3 months ago | 0

Answered
How can I access both data and time from the running simulink model and use it in a particular program?
Simulink has a "to workspace" block which saves the time history of the model data to the Matlab workspace in a variable that yo...

3 months ago | 0

Answered
How to create a loop with unknown number of iterations?
What you are describing sounds like a "while" loop. You specify a logical condition which will terminate the loop i=0; condit...

3 months ago | 0

Answered
How can I plot two functions in the same graph?
Try this: fplot(@(x) cosh(x)); hold on fplot(@(x) 0.6671x^3-1.7921x^2+2.7580x-0.089);

3 months ago | 0

Answered
Transformation matrix between two cartesian systems
Coordinate rotation (or transformation) involves expressing the coordinates of a point defined in one reference frame in terms ...

3 months ago | 1

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Answered
Issue with doing FM on SIMULINK
1) The error is generated because the integration block is a continuous block, and you have specified a discrete solver. Change...

3 months ago | 0

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Answered
Constant block doesn't accept array
Yes, you can save the value to the workspace and reference it in a constant block. As @Paul points out, the label on the Goto b...

3 months ago | 1

Answered
How to add x and y variables to individual values after creating a heatmap.
You can modify the axis properties after creating the plot: ax = gca; % get the curent axis handle ax.XTickLabel = {'Jan','Fe...

3 months ago | 0

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Answered
draw rod shape trajectory
You might want to give this a try: Plot3 Shaded Line

3 months ago | 0

Answered
How to change my Simulink Scope output at workspace from 1x1x284 double to 284x1 double.
Try using the "reshape" command. There is also a reshape block in Simulink.

3 months ago | 0

Answered
For-loop using only last iteration
Inside the loop C = zeros(1,10) + A; the function "zeros(1,10)" is assigning zeros to the entire C vector, then adding A. Als...

3 months ago | 0

Answered
How can i merge the signals from the sensors into 1 signal ?
The merge block is not used to combine signals - it is used to select one of two triggered signals. The two inputs are signals ...

3 months ago | 0

Answered
Output for Accelerator Model
I think there is a misunderstanding. The way I read it, if you use a large number of inport and outport blocks (at the root lev...

3 months ago | 0

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Answered
What kind of numerical method is used for the inverse kinematic block at simulink?
Here is a link to the Matlab documentation: Inverse Kinematics Algorithms

4 months ago | 0

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Answered
Hold a value indefinitely once a condition becomes true
Try This:

4 months ago | 0

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Answered
Trying to plot array points on a graph.
You might also try this: [row,col] = size(AA); % AA is the data matrix figure; for ii=1:row for jj=1:col if ...

4 months ago | 0

Answered
How to connect the two signals in one signal in MATLAB Simulink? I mean first signal finishes second signal starts.
You description of the problem is confusing to me, bu the statement in the title "first signal finishes second signal starts" ...

2 years ago | 0

Answered
Numerical Integration in Matlab
There seem to be two problems: 1) your function "fun" returns "NaN" at zero, so you cannot integrate starting from zero. You n...

2 years ago | 0

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