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Jim Riggs


Missile Defense Agency - Advanced Technology Group

Last seen: Today Attivo dal 2017

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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Risposto
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...

37 minuti fa | 0

Risposto
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...

8 giorni fa | 0

Risposto
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...

circa 2 mesi fa | 1

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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 mesi fa | 0

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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 mesi fa | 0

Risposto
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 mesi fa | 0

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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 mesi fa | 0

Risposto
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 mesi fa | 0

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Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

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Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 1

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Risposto
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 mesi fa | 0

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Risposto
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 mesi fa | 1

Risposto
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 mesi fa | 0

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

3 mesi fa | 0

Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

Risposto
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 mesi fa | 0

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Risposto
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 mesi fa | 0

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

4 mesi fa | 0

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Risposto
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 mesi fa | 0

Risposto
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" ...

circa 2 anni fa | 0

Risposto
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...

circa 2 anni fa | 0

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Risposto
Simulink counter block having an initial starting value of -1
Yes, the two counter blocks in the library do not allow you to set the initial value. Whenever I need to use a counter, I usual...

circa 2 anni fa | 1

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