# Alan Stevens

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**Content Feed**

How to solve this implicit equation in matlab?

Good idea to plot a graph first, to see roughly where the root lies. Then use fzero. For example:: fn = @(x)log((0.77*x-0.77)...

ongeveer 16 uur ago | 0

Problem with solving discrete element method using leap frog method

The following gets the code working, but I've no idea if the results are meaningful!! n_part=4; kn=5; kt=2/7*kn; m=0.3; g=9...

1 dag ago | 0

| accepted

Write a loop to plot a model graph

A little more like this. You need a smaller value of dv and a while loop. The fit isn't very good! %% Observed Wave dispersi...

2 dagen ago | 0

| accepted

Making a line thought points plotted from for loop in MATLAB

Like this? R1= 1399.580e+6; C1= 374.868e-6; R2= 1497.005e+6; C2= 350.472e-6; R3= 19573.407e+6; C3= 2429.373e-12;...

3 dagen ago | 0

| accepted

How do I plot and return the values of multiple intersections between a function and zero?

Here's one possibility (though you get repeated results for the roots!): det_a = @(x) sin(x).*cosh(x) - cos(x).*sinh(x); x=0:1...

3 dagen ago | 0

| accepted

Simplify Matrix decimal to integers

One way is M = [881/2158 985/1393 780/1351 881/2158 -985/1393 780/1351 -881/1079 ...

4 dagen ago | 0

Tring to solve for a transcendental equation

You can rearrange the equation as eigen*tan(eigen) = Bi and use fzero as below. However, because of the nature of tan, your res...

6 dagen ago | 0

| accepted

Question regarding MATLAB code to solve for electron in constant electric and magnetic field

If you are going to use global variables they need to be declared outside the function as well as inside. Your values of q and ...

9 dagen ago | 0

Hello, I am trying to plot the transmission coefficient vs energy for the double barrier potential, but I get an error. May I know what I have done wrong here?

See the following V_0 = 0.2800; % Barrier strength in eV hbar = 1.054571596e-34; % Reduced Planck constant m = 5.465629128e-3...

9 dagen ago | 0

Simulation of point kinetics reactor equations

There are seven equations if you are using all six delayed neutron groups. You don't give your reactivity, nor the individual b...

16 dagen ago | 0

| accepted

calculating angle between line of best fit and x axis

Take the arctangent of the gradient of the straight line.

16 dagen ago | 0

deleting separate zeros from vector

Here's one way (there is probably a slicker way!): A = [ 0 0 1 0 0 0 1 0 1 0 0 1 5 9 8 2 0 3 0 1 0 0 0 ]; ...

17 dagen ago | 0

Making a Euler Method script to solve for velocity but am encountering "Array indices must be positive integers or logical values" Error

Try changing your loop to for i=1:numel(t) %%% i loop not t f = (g - (D * p * A * v(i).^2)/(2*m)); %%% v(i) v(i+1) ...

17 dagen ago | 0

Error solving for a particular variable from two equations

You could use fzero: TonTc = 0.01:0.01:0.99; a = zeros(1,numel(TonTc)); a0 = 1; % initial giuess for k = 1:numel(a) ...

18 dagen ago | 0

| accepted

Replacing sym with function handle

Do you mean something like this? phi = pi/3; [nr, wr] = fn(phi); disp(phi) disp(nr(4)+56*3/2) disp(wr(4)) function [nr...

18 dagen ago | 0

I'm trying to solve this system of ODE's describing a mechanical spring model.

Might be better to forget about symbolics, treat each 2nd order ode as two first order ode's and do the following: %applied for...

21 dagen ago | 0

Solving a first order ODE with Euler backwards method

Your y_true is only valid for t>= 5 (smaller values give imaginary results for y). So, try going from 5 to 8: % y_true = log(t...

21 dagen ago | 0

| accepted

Need help to create a loop

How about: e=2.7183; gamma=0.1333; k = [1,9,23,7,23,9,20,29,63,102,73,59,27,130,75,185,70,92,326]; Rt=0:0.01:10; P = zero...

21 dagen ago | 1

Newton's method iterations

I suggest you plot a graph of your function, then you can see where good initial estimates would be. For example f = @(x) 2*ex...

22 dagen ago | 0

the variable appears to change size every loop iteration

Answered here: https://uk.mathworks.com/matlabcentral/answers/1464024-the-variable-appears-to-change-size-every-loop-iteration?s...

23 dagen ago | 1

Writing the dirac function as a function handle

Try dirac_i = @(x) x==i; % This assumes i has been fixed before the function is defined

23 dagen ago | 0

| accepted

How to plot 2 graphs with input as a range and join them together?

Like this p0=0; p1=6; p2=1; p3=3; p4=3; t=[0:0.01:1]; x1 = (1/6)*[((((-t).^3)+(3*(t.^2))-(3*t)+1)*p0)+(((3*(t.^3))-(6*(t....

23 dagen ago | 0

the variable appears to change size every loop iteration

You don't need the loop: If = [0 0.5 1.0 1.5 2.0 2.5]; Ea = [0 75 150 205 242 270]; Ra = 0.14; RI = 2; la = 100; Ifield = ...

23 dagen ago | 1

Unable to find solution to matrix using Gauss Seidal code. How should I proceed to get the solution?

You are dividing by A(i,i) some of which are zero. These will introduce NaNs.

24 dagen ago | 0

Solving Eqn with Varying Variable (Ms)

Like this: a1a4 = 1./[1, 2, 4, 10]; n = 10000; p4p1 = 1:n; M = zeros(numel(a1a4),n); for j = 1:numel(a1a4) m = 1.01; ...

26 dagen ago | 1

| accepted

To solve two 2nd order coupled differential equation using ODE45?

Replace each 2nd order ODE by two 1st order ODEs. e.g. set V1 = X1', V2 = X2', then V1' = (50*sin(f(t) - V1)*V2')/sin(f(t)), V...

27 dagen ago | 0

| accepted

Using Ode45 to solve dynamics problem (ISA model)

Like this z0 = 39045; %const.h0; v0 = 0; %const.v0; t0 = 0; tf = 800; N = 60000; tspan = linspace(t0, tf, N); X ...

27 dagen ago | 0

| accepted

Curve fitting a power law function

Like this? h0=0.654; %[m] This seems to be unused h_t=[0.654;0.628;0.604;0.582;0.56;0.54;0.52;0.501;0.482;0.465;0.447;0.43;0.4...

29 dagen ago | 0

Finding approximate real solution to a equation

You don't need syms here. Try the roots function. help roots

ongeveer een maand ago | 0

| accepted