Answered
help me in trying to solve the secant method
Try preallocating x, right after you define n: n = 100; x = nan(1,n); ...

4 years ago | 0

Answered
trying to calculate the central diff approximation
There is a Matlab function "diff" which will do this. Otherwise, your subscripts must all match (2:end-1) Adi_1 = diff(Vdi_1...

4 years ago | 0

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Answered
Performing calculations (Newton's method) over values in loop
Yes, your loop is not quite right. Notice your placement of the three lines i=1; converge = false; po = p_init(1); These t...

4 years ago | 0

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Answered
Draw a circle for arbitrary orientation on spherical surface
My approach is to define the circle around the X-axis, then rotate it into the desired position through a Yaw-Pitch rotation. ...

4 years ago | 3

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Answered
the meaning of basic matlab words
an argument is a constant or variable that you provide to a function; e.g. sin(x) % here x is the argument to the function sin...

4 years ago | 0

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Answered
How to alter Comet Speed
I don't see a way to control the speed of the comet function. There is a discussion of controlling the speed of an animated lin...

4 years ago | 1

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Incorrect Answer Calculated For Force Calculation
It is assumed that you want to find F3 and y such that the system is in equilibrium (this is not stated) (and I disagree with D...

4 years ago | 0

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Transformation Matrix Between Two Cartesian Systems
This is a very generic question and there are many ways to answer. It depends on what information you have about the two coordi...

4 years ago | 0

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Why is ode45 changing the value of the state variable between calls to my dynamics function?
ode45 implements the Dormand-Prince method which is an embedded 4th / 5th order Runge-Kutta method. For every "step" in the sol...

4 years ago | 0

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Answered
Implement friction into a model, related to the velocity. (Missile Launch)
This question is familiar. look here.

4 years ago | 0

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How to make a marker circle bold?
plot(x, y, 'ro', 'linewidth',2);

4 years ago | 2

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Answered
how can i resolve this equation Runge kutta method
Ths is the equation for a parabola. y'' = -1 y' = -y y = -1/2 y^2 No need for a numerical approximation.

4 years ago | 0

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Missile Lauch friction gamma factor - Output deviating from desired output, please help!
Step 1: Draw a free body diagram that shows the body with all of the forces that act on it and the coordinate frame(s) that are...

4 years ago | 0

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Answered
How to calculate the slope from geopraphical coordinates?
First of all, you should consider the relationship between the WGS84 lat/lon/alt and the ECEF frame. Altitude is perpendicular ...

4 years ago | 1

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calculate rotation matrix in 3D
I'll assume that we make the reference frame right-handed by negating the axis_3 vector such that axis_1 = [2.7239 -0.2014 -...

4 years ago | 1

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Answered
Translational motion of a rotating object.
To begin, Chasles' theorem states that translational motion and rotational motion obey the law of superposition. Therefore, you...

4 years ago | 0

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change variable value based on other variable in if loop
Your input command is requesting a string input: in1 = input('first: ','s'); in2 = input('second: ','s'); This results in in1...

4 years ago | 1

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Answered
I don't know the problem involved Backward difference.
I am assuming that your question is that you don't understand Simpson's rule. Below is an exerpt from Wikipedia: Simoson'...

4 years ago | 0

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Answered
1-2-1 or X-Y-X rotation matrix not supported
I recently cataloged all of the permutations of the 2 and 3 axis planar rotations. It is easy to write your own functions. See...

4 years ago | 0

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Extracting data from simout MATLAB work space
simout is a timeseries structure. I like to extract separate vectors from the structure, for example: t = timout.time(simout.t...

4 years ago | 0

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Where can I publish Matlab-compiled software?
If you want to share the source code, you can post it on Matlab File Exchange

4 years ago | 0

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In my Simulink model I would like to conditionally write output data to selectable .mat files in different relative directories.
This sounds like a rather sophisticated way of constructing output. I'm not sure if that is easily acomplished with the "to fil...

4 years ago | 0

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Answered
minimum feret diameter of particle
https://blogs.mathworks.com/steve/2018/02/20/minimum-feret-diameter/?s_tid=answers_rc2-1_p4_MLT

4 years ago | 0

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Vlookup equivalent function for matlab
If your data is in a 2D table (matrix) and you want to locate a column that matches the exact value from another column, then lo...

4 years ago | 4

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Answered
How calculate the second and third numerical derivative of one variable f(x)
The Matlab "diff" function is basically the Backward difference formula. There are much more accurate ways to compute numerical...

4 years ago | 1

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Runge kutta order 2 by hand
In the statement Y(1) = [t(1);y(1)] the simi-colon ";" indicates you are attempting to put 2 rows of numbers into a single ro...

4 years ago | 0

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Correct way to detect Zero crossing
A thought you might want to consider: if you multiply the current value, y(i) by the previous value y(i-1), this product is on...

4 years ago | 3

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How to add optional outport to simulink model?
You can use a switch to select between the two different output options that you want, and there are a number of ways to activat...

4 years ago | 0

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Answered
Ralston's method function
There is an error in your function in the k2 term. For Ralstons method, it should be: k1 = h*f(t(i), y(i)); k2 = h*( f( t(i) ...

4 years ago | 0

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First and Second Order Central Difference
For starters, the formula given for the first derivative is the FORWARD difference formula, not a CENTRAL difference. (here, ...

4 years ago | 2

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