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

oltre 4 anni fa | 0

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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*(...

oltre 4 anni fa | 0

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Risposto
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...

oltre 4 anni fa | 0

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Risposto
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); ...

oltre 4 anni fa | 0

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Risposto
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 ...

oltre 4 anni fa | 1

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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,...

oltre 4 anni fa | 1

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

oltre 4 anni fa | 1

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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...

oltre 4 anni fa | 0

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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)...

oltre 4 anni fa | 0

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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...

oltre 4 anni fa | 1

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Risposto
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...

oltre 4 anni fa | 0

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Risposto
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;...

oltre 4 anni fa | 0

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Risposto
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...

oltre 4 anni fa | 0

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

oltre 4 anni fa | 0

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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...

oltre 4 anni fa | 0

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Risposto
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 ...

oltre 4 anni fa | 0

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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...

oltre 4 anni fa | 0

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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...

oltre 4 anni fa | 3

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

oltre 4 anni fa | 0

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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 ]; ...

oltre 4 anni fa | 0

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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) ...

oltre 4 anni fa | 0

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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) ...

oltre 4 anni fa | 0

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Risposto
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...

oltre 4 anni fa | 0

Risposto
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...

oltre 4 anni fa | 0

Risposto
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...

oltre 4 anni fa | 0

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Risposto
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...

oltre 4 anni fa | 1

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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...

oltre 4 anni fa | 0

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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...

oltre 4 anni fa | 1

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

oltre 4 anni fa | 0

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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

oltre 4 anni fa | 0

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