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Jim Riggs


Missile Defense Agency - Advanced Technology Group

Last seen: 4 Tage vor |  Aktiv seit 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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  • Knowledgeable Level 5
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  • 36 Month Streak
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Beantwortet
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...

etwa 2 Monate vor | 0

Beantwortet
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...

etwa 2 Monate vor | 0

Beantwortet
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...

2 Monate vor | 0

Beantwortet
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...

4 Monate vor | 1

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Beantwortet
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...

4 Monate vor | 0

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Beantwortet
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 % ... ...

4 Monate vor | 0

Beantwortet
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...

4 Monate vor | 0

Beantwortet
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...

4 Monate vor | 0

Beantwortet
How to create equation with time instant in simulink work space
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4 Monate vor | 0

Beantwortet
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])...

4 Monate vor | 0

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Beantwortet
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...

5 Monate vor | 0

Beantwortet
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'], ...

5 Monate vor | 0

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Beantwortet
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...

5 Monate vor | 0

Beantwortet
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...

5 Monate vor | 0

Beantwortet
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...

5 Monate vor | 0

Beantwortet
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);

5 Monate vor | 0

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

5 Monate vor | 1

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Beantwortet
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...

5 Monate vor | 0

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Beantwortet
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...

5 Monate vor | 1

Beantwortet
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...

5 Monate vor | 0

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

5 Monate vor | 0

Beantwortet
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.

5 Monate vor | 0

Beantwortet
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...

5 Monate vor | 0

Beantwortet
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 ...

5 Monate vor | 0

Beantwortet
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...

5 Monate vor | 0

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Beantwortet
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

5 Monate vor | 0

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

5 Monate vor | 0

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Beantwortet
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 ...

6 Monate vor | 0

Beantwortet
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" ...

etwa 2 Jahre vor | 0

Beantwortet
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...

mehr als 2 Jahre vor | 0

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