Alan Stevens

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Answered
Simpsons 1/3 rule function not working
Are you looking for something like this? a = 1; b = 3; f = @(x) exp(x); n = 6; Ysimp = simp13(f,a,b,n) Yexact = exp(b)-ex...

ongeveer een maand ago | 0

Answered
Finding the points where Bessel functions are equivalent
Like this? um = 1e-6; nCore = 1.4682; nClad = 1.446; lam = 1.55*um; k = 2*pi/lam; a...

3 maanden ago | 0

Answered
Alternative to ginput for finding curve intersections with unevenly spaced data in MATLAB
Create a function using interp1 for use with fzero. For example: yfn = @(X,Y,x) interp1(X,Y,x); X = [1,2,3,7,8,9]; Y1 = X...

3 maanden ago | 1

Answered
ode45 not able to solve one particular IVP
How about: y = -3:0.4:3; % pick values of y x = -3:0.4:3; % pick values of x [xg,yg] ...

5 maanden ago | 0

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Answered
Erro ao usar matlab.internal.math.interp1 Os pontos de amostra devem ser exclusivos.
Well, this gets it working, but you need to check your function equilibrio as it doesn't cross zero until T is between 3400 and ...

7 maanden ago | 0

Answered
Generate a vector with elements based on certain elements in another vector
Like this? A = [0;0;0;0;0;1;1;1;1;1]; B =zeros(size(A)); ptr = find(A==1); B(ptr(1):ptr(1)+2)=1

7 maanden ago | 1

Answered
Solving the problem for the free extremum of a function of several variables - numerical determination local minimum.
Here's a "starter for ten" with the Newton-Raphson method: % Newton-Raphson Approach % Function f = @(x,y)x^4+5*x^2-9*x^2*...

7 maanden ago | 0

Answered
Finding max value of 1D vector when all values could be negative
Try [M, I] = max(abs(DD)) M = DD(I)

7 maanden ago | 0

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Answered
Issue with correct Fanno parameter when using flowfanno function.
fL/D suggests the Darcy-Weisbach friction factor is being used. 4fL/D suggests the Fanning friction factor is being used. (T...

8 maanden ago | 0

Answered
Using Runge Kutta to solve second-order differential equations with two degrees of freedom
Like this? omega = 0.05:0.05:20; tspan = [0 2*pi]; xmax = zeros(1,numel(omega)); for i = 1:numel(omega) X0 = [0...

8 maanden ago | 0

Answered
Changing the value of only one parameter causes a problem (possibly with while loop)
You can see from the following that when i = 3, 4 and 7, V(i) stays at a constant value greater than Vmax %% Constants and Assu...

8 maanden ago | 0

Answered
Why is the set of numbers p2 not showing up on my graph
Should it be more like this? (Though I don't recognize the value you have for the gas constant; and temperature would normally b...

8 maanden ago | 0

Answered
Reproducing Water Defect Mode Plot in MATLAB (Only Getting 0.1748 Transmittance Instead of Sharp Peak of 1)
The size of the peak is very sensitive to the increments in your lambda range: n_Si = 3.465; % Refractive index of Si n_SiO...

8 maanden ago | 1

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Answered
I'm trying to solve jeffry hamel equation using RK4 but it's not giving output as expected.
The following code produces something very close to the plot that you want to see. However, the values of g(1) are nowhere near...

8 maanden ago | 1

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Answered
i try to put two plot in one graph using legend but one of them just looks been 'cut off', can someone help me to fix this problem
Plot both curves the same way (i.e. t then x)! x0=2.1; g=9.81; k=45; m=7; t=0:0.1:6; x1=@(t) x0*cosd(t*(sqrt(k/m))); x_t_...

9 maanden ago | 0

Answered
Implementation of the analytical expression for the magnetic field of a circular current loop and interpretation/representation of the results
When I run it I get different signs as well as slightly different magnitudes: %% Analytical calculation of the magnetic field o...

10 maanden ago | 0

Answered
How to remove gaps in timeseries plot to have a continuous graph
Include a NaN in the data list between each data set.

10 maanden ago | 0

Answered
what the reason behind roundoff error inside while loop
Compare the following dt = 0.1*16^-1; t = 0; while t<1 t = t+dt; end disp(t) t = 0; c = 1; while t<1 t = c...

10 maanden ago | 0

Answered
Something doesn't work for me in fit
Here's a fit using fminsearch (I just used a quick but coarse approach- the code can be made much cleaner!). v=[10 30 5...

10 maanden ago | 0

Answered
Plotting while skipping the middle point in a vector
Something like this? tic v1 = [1 2 3 4 5 8 9 10 20 21 22 30 31 32]; dv = diff(v1); ix = find(abs(dv)>1); v = []; s2 = 0; f...

11 maanden ago | 1

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Answered
help with nested loop and plot
Here's another way, still using nested loops: n= 101; x = linspace(-100, 100, n); y = linspace(-100, 100, n); [X, Y] = meshg...

11 maanden ago | 0

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Answered
How to integrate an implicit acceleration function to a fitting pair of graphs of velocity and displacement
Look up ode45 for the integration (for a fixed set of parameters) and fminsearch for fitting the parameters to known data.

11 maanden ago | 0

Answered
Brush: How can I change the font color of the displayed X and Y range?
Select the Property Inspector, select the text, choose a color. (The following code is just to get the image uploaded) I=imrea...

12 maanden ago | 0

Answered
how to use an integral function inside a for loop? i need to find the value of function that chages as i chages .then using this values i need to find another integral.
Are you looking for something like this? r0 =0.1; u =[1:7]'; Q =zeros(length(u),1); E =zeros(length(Q),1); Q = @(x)0.023*(r...

12 maanden ago | 0

Answered
Simpson integral - problem with writing the formula
Should be x(i) etc. not a(i). Also be careful with brackets. % Test 1 a = 0; b = 1; n = 10; f = @(x)1-x+x.^3; I = simpson(f...

12 maanden ago | 0

Answered
How do I apply iteration method to an integral?
Look up help on function fzero.

ongeveer een jaar ago | 1

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Answered
How can I plot a reflection angle of a projectile in a kinematics model? Overlay projectile motion plots?
Surely you only need to reverse the x-velocity? imperialBallVelocity = 52.20; release_angle = 42; release_height = 64.2; %Ki...

ongeveer een jaar ago | 1

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Answered
Why am I receiving this error?
You have 4 layers layer_angles = [45, -45, -45, 45]; but data for only three mid_plane_strains = [0.05, 0.00, 0.00]; % Mid-p...

ongeveer een jaar ago | 0

Answered
Function g Returns Only 2 Values Instead of Array - Vectorized Operation Issue in MATLAB
You have g as a function of x2, but x2 doesn't appear on the right-hand side!

ongeveer een jaar ago | 0

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Answered
Solve for x with given equation
Look up the help on function fzero. And don't forget that Matlab doesn't recognise implicit multiplication. x(...) should...

ongeveer een jaar ago | 0