# Alan Stevens

Followers: 0 Following: 0

**Statistics**

**MATLAB Answers**

**0** Questions

**1,256** Answers

RANK**57**

of 290,830

REPUTATION**3,304**

CONTRIBUTIONS

**0** Questions

**1,256** Answers

ANSWER ACCEPTANCE **
0.00%
**

VOTES RECEIVED**346**

RANK

of 19,711

REPUTATION**N/A**

AVERAGE RATING**0.00**

CONTRIBUTIONS**0** Files

DOWNLOADS **0**

ALL TIME DOWNLOADS**0**

RANK

of 145,380

CONTRIBUTIONS

**0** Problems

**0** Solutions

SCORE**0**

NUMBER OF BADGES**0**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Feeds**

How do I apply iteration method to an integral?

Look up help on function fzero.

12 days ago | 1

| accepted

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...

26 days ago | 0

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...

29 days ago | 0

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!

1 month ago | 0

| accepted

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...

1 month ago | 0

power method with rayleigh coeff

Make sure you call the function with the arguments in the same order as those defined in the function! A=[4 1 -1 0;1 3 -1 0;-1 ...

1 month ago | 0

| accepted

Fill area between two vertical curves

Like this: value = [186.7646 198.4115 191.1406 180.8430 175.7136 ... 167.7459 151.2865 144.5964 139.8148 139.4305 188.2865 204...

2 months ago | 2

| accepted

Simplificar el resultado como valor numerico

Why not simply: p1=[2;3] ; x0_1=@(theta) [cos(theta); sin(theta)]; % =[x1*x0; x1*y0] y0_1=@(theta)[-sin(theta); cos(theta)];...

2 months ago | 1

Optimizing code for HAC Weight matrix generation - How to be faster?

Try replacing the loops with something like this: i = (1:size(Weight_correlation,1))'; j = 1:size(Weight_correlation,2); c = ...

2 months ago | 0

How to a create a label at the bottom of a vertical line?

Like this? x = linspace(0,6,100); y = exp(x); plot(x,y) xline(4.5,'-',{'Acceptable','Limit'}, 'LabelVerticalAlignment', 'bot...

2 months ago | 0

| accepted

Secant method Nan Error

You haven't updated error in your while loop. Try including something like error = abs(X0-X1);

2 months ago | 0

| accepted

Function error in ODEs RK4 method, solving 6 unknowns

It works for me (I've commented out the fprint statements in the code below - but it works with them in!): global CDin psi thet...

2 months ago | 0

| accepted

I keep getting the error using '/'.

Try mu_ratio=(1-(vol_frac(c,1)/0.605).*((particle_ratio(c,1)).^1.2)).^(-1.5125); Notice the dots! .* .^ Difficult to be...

2 months ago | 0

Plateau followed by one phase decay

Like this? x = 0:0.5:20; % time in seconds Y0 = -0.6; % signal baseline value Plateau = -1; % singnal plateu after trigger/st...

3 months ago | 1

Radiation view factor using Monte Carlo

I think you probably need cos(theta), rather than theta, to be linearly spaced.

3 months ago | 0

How to fix a syntax in the oscillator's plot code?

Like this (both x_1 and x_2 are contained in y) T0 = 10; omega0 = 1; M = 1; F = 1; x_1 = 0; x_2 = 0; x_0 = [x_1 x_2]; ts...

3 months ago | 0

| accepted

ODE45has long runtime and graph will not plot

Here's my attempt to make sense of your equations tauspan = 0:100:10000; % p0 = [0.5 0.5 0 0]; % dp1dt = -rf + rr % dp2...

4 months ago | 0

Two graphs in the same plot, why?

Something like this data = xlsread('sunHoursInTrollhattan.xlsx'); mins = data(:,1)*60 + data(:,2); plot(1:12, mins,'o'),grid ...

4 months ago | 0

| accepted

Two graphs in the same plot, why?

You have the hours as one plot and the minutes as the other! Turn the data into all minutes, or all hours first.

4 months ago | 0

Could anyone help me in fixing the problem in my code for solving the initial value problem numerically: y'=y^2, y(0)=1?

Here's an attempt using fminsearch. I don't know anything about the Obreschkoff method, so couldn't say if your equations are...

4 months ago | 0

| accepted

I get this message(Attempted to access F(5); index out of bounds because numel(F)=4.) when I run the code below..

In fsode you try to use F(7) when calculating F(5), before you have calculated F(7)!

4 months ago | 1

| accepted

Laser Rate Equation Modelling

Like this? (Look at lines 27, 28 and 38) %Script % Define model parameters temperature = 25; wavelength = 1.312e...

4 months ago | 0

Determine the coordinates of the nodes forming the outermost circle

Here's an alternative way: nodes = importdata("nodes.mat"); figure plot3(nodes(:,1),nodes(:,2),nodes(:,3),'b.','Markersize',1...

4 months ago | 0

Problem with fitting a loglog plot

polyfit doesn't like the log of zero. One option is to remove the first row of the data: data_exp_high = load("data_Q_1e-8.txt...

4 months ago | 0

Index in position 2 exceeds array bounds (Index must not exceed 1) errors?

N0 is a 4x1 vector, but you call it with two indices in the for loop! Turn N(1,j) into N(1) and similarly for the other calls t...

4 months ago | 0

| accepted

How do I solve this ODE system where there exists derivatives in both sides?

You can separate the terms as follows:

4 months ago | 0

why am i getting grey figure box can someone fix please

Making some assumptions about your function pendulumODE, I think the following is more like what you expect to see: % Constants...

4 months ago | 0

Algae growing, concentration curve problem

Increase nt to 10000 and it works just fine for T = 20000.

4 months ago | 0

Error ''Array indices must be positive integers or logical values.'' when putting interval of 0.01 in a for loop

More like this: k = 0:0.1:2; n = numel(k); for i = 1:n x(i) = k(i); y(i) = k(i)*k(i) + 3*k(i) - 4; end plot(x,y...

5 months ago | 0

Trying to code from Polymath

Like this for example (I'll leave you to extract the numerical values): Wspan = [0 2]; % Integration range % Initial valu...

5 months ago | 0