Beantwortet
Break the for loop
Something like this perhaps: fib = [1; 1]; its = 0; keepgoing = true; while keepgoing its = its+1; r = rand; ...

mehr als 4 Jahre vor | 0

Beantwortet
How to take data on a column matrix (2661 x 1 double) for every 4 row then 3, sequently? So we take data only row 1, 5, 8, 12, 15, 19, 22, ... etc? Thank you.
Here's one way. There's probably a neater way. data=rand(1,2661); n = ceil(2661/3.5); ptr(1)=1; for i = 2:n ptr(i) = 4*(...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
Random draws from conditional multinomial distribution
Something like u = rand(1) if u<0.2 d = 0; elseif u<0.7 d = 2571; elseif u<0.9 d = 2571^2; else d = 25...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
How to define and plot a function with input range?
Like so: pt = @(t) (1 ./ (1 + t .^ 2)).*(t>=-0.5).*(t<=0.5); x = 0:0.01:10; y = 2*pt(x-1) + 4*pt(x-2) + 3*pt(x-3) + pt(x-4); ...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
Plot the slope of a parabola with only the data points being known
Like this? x = linspace(-0.5,0.5,25); %length in (meters) def_3mm_no_grav = -[0.00 5.82e-1 1.08 1.53 1.94 2.30 2.62 2.89 3.12 ...

mehr als 4 Jahre vor | 1

Beantwortet
SIRE with vaccine model
Like this tspan = [0 1.5]; options = odeset('Refine', 10, 'RelTol', 1e-4); y0 = [5185000*0.3 5185000*0.7 1 1 0 0 0 0]; [t,...

mehr als 4 Jahre vor | 1

| akzeptiert

Beantwortet
Problem with fplot function - displays grey zone instead of functions
Change all the ^ to .^ (i.e. dot^)and the * to .*

mehr als 4 Jahre vor | 1

Beantwortet
I would like to create a handle function by for loop in matlab, but it does not work. I will be thankful if some body help me.
More like this? sfn = @(x,a,b) (a - b)*x; a=[1 2 3]; b=[4 5 6]; n=length(a); x = 1; % specify whatever x value you want f...

mehr als 4 Jahre vor | 0

Beantwortet
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)...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 1

| akzeptiert

Beantwortet
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...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
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;...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
Simplify Matrix decimal to integers
One way is M = [881/2158 985/1393 780/1351 881/2158 -985/1393 780/1351 -881/1079 ...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
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 ...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 3

| akzeptiert

Beantwortet
calculating angle between line of best fit and x axis
Take the arctangent of the gradient of the straight line.

mehr als 4 Jahre vor | 0

Beantwortet
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 ]; ...

mehr als 4 Jahre vor | 0

Beantwortet
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) ...

mehr als 4 Jahre vor | 0

Beantwortet
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) ...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

mehr als 4 Jahre vor | 1

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 1

Beantwortet
Dealing with NaN Values
Try find(isnan(data))

mehr als 4 Jahre vor | 0

Beantwortet
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

mehr als 4 Jahre vor | 0

| akzeptiert