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David Wilson


Auckland University of Technology

80 total contributions since 2011

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Answered
Simulating a FIR filter
Use the filter command. In this case your denominator, (A), coefficients are just 1. x = [ 0 0 0 1 1 1 1 1 ]' % input b = [...

circa 16 ore ago | 1

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Answered
Obtain input knowing output and transfer function
Since you have a simple transfer function, here's what I would do. (1) First generate some data that we will subsequently try ...

12 giorni ago | 0

Answered
curve fitting of non linear data for strain-time of creep experiment
Here's my attempt: load data1 t = time; e = strain; plot(t,e) %% Now try curve fit creep = @(p, t) p(1)*(1-exp(-p...

16 giorni ago | 0

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Answered
Trouble with time delay differential equation
I've only made one small change to your function. You have tried to index a non-integer number back, but the "Z" variable holds ...

16 giorni ago | 0

Answered
How can I simultaneously solve for these equations?
If you have the symbolic toolbox, a straight forward approach works, although it takes some time ... % ODE propblem syms B...

26 giorni ago | 0

Answered
Error when using ode15
It is good practice to try and avoid globals, but rather pass them as auxilary variables into the function. Fao = 1487.351; % ...

27 giorni ago | 0

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Answered
Plotting Step Response of a Differential Equation
You are close to a viable solution. Solve for an analytical solution, then make it a Matlab (anonymous) function with matlabFunc...

27 giorni ago | 0

Answered
Runge-Kutta 4th order method
First up, you will need a much smaller step size to get an accurate solution using this explicit RK4 (with no error control). I ...

circa un mese ago | 0

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Answered
How to draw Fig. 1 from the attached pdf with this code
I didn't bother draw the other 3 lines, but you just ned to make the necessary changes to gamma for that. If you run somethi...

circa 2 mesi ago | 0

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Answered
fsurf not drawing cant explain
Do you really need to use the symbolic toolbox? Why not just plot a numerical surface? But you are right, your numbers are widel...

circa 2 mesi ago | 0

Answered
Fitting Monod Equation with ODE45 to data using lsqcurvefit function
Here's my solution. First set up the measured data, plot it, and look to see that it is all OK. t = [0 3 5 8 9.5 11.5 14 16 ...

circa 2 mesi ago | 0

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Answered
Solve integrals with Matlab
Do you have the symbolic toolbox? If so, start with the int command. You can do both indefinite and definite integration. sy...

circa 2 mesi ago | 1

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Answered
MATLAB Help - Rolling Dice Simulation / Central Limit Theorem
A quick hack using randi and cumsum is N = 100 x = randi(6,N,6); cs = cumsum(x')'; for i=1:6 subplot(3,2,i) histogram...

2 mesi ago | 0

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Answered
How to calculate the accumulated rainfall value of 1, 2, 3, 4, 5, 6 and 7 days.
Here is my solution: I notice that you've got few NaNs for about a year and a half. Your last year is also incomplete. I is...

2 mesi ago | 0

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Answered
plot x axis as persentage
Below, I've plotted an arbitrary function between arbitrary limits, -5 and +37. %% x = linspace(-5,37)'; y = erf(x/20); ...

2 mesi ago | 0

Answered
inline function error help(tanh)
I can, but perhaps you should use anonymous functions. The inline approach is now discouraged. Instead of what you wrote above...

2 mesi ago | 0

Answered
how to plot multiple waves on one surface
Here is a mock up solution. Code is: below. I've used part of your data, but I've made up some similar data (using a sinc fun...

2 mesi ago | 0

Answered
LaTex with 2 strings separated by a num2str
Use an escape (backslash) for the % errordisplay=[' $\varepsilon_{RTP}=$ ',num2str(rtep),'\%'];

2 mesi ago | 1

Answered
Solving second order implicit differential equation
Just convert the 2nd order ODE into Cauchy form. You will of course need 2 initial condtions. Define x, now you original equat...

2 mesi ago | 0

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Answered
Stimulating Chemical Reaction with Differential Equation on Simulink
Homework? Anyway, to get you started, take a look at my Simulink layout: I've painted the integrators yellow, and I have expli...

2 mesi ago | 0

Answered
how do i rotate an airfoil points? and plot.
Does this look better? Some (small) changes to your code. I swapped your rotation direction to better follow your example pl...

2 mesi ago | 2

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Answered
plotting an exponential will a matrix over time
OK, your question is a bit vauge, and there are missing bits, i.e. the start point for y. I'm assuming you are trying to solve...

2 mesi ago | 0

Answered
finding lengths of an ellipse
If you need a little more help, then it pays to plot the ellipse and look at the arc lengths. t = linspace(0,2*pi)'; x = @(t)...

2 mesi ago | 0

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Answered
I want to know how i can apply k-means clustering on my scatter plotted dataset.
You probably want to use kmeans. Since you didn't give us any data to workj with, nor did you give us any idea of the number o...

2 mesi ago | 1

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Answered
Fitting model to titration data
For one thing, you don't assign an answer to function sseval. That's not going to help things. Here's my solution: I've re...

2 mesi ago | 1

Answered
Position of two subplots with bar charts
One option is to obtain the position of the plot with the long legend, and then re-size the other to the same width. But it's pr...

2 mesi ago | 0

Answered
Histogram x axis tick labels – string
Try >> get(gca,'XTicklabel') and hack that.

2 mesi ago | 1

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Answered
Histogram x axis tick labels – string
Released 2016b. What's your version? >> which xticklabels C:\Program Files\MATLAB\R2018b\toolbox\matlab\graph3d\xticklabels.m...

2 mesi ago | 0

Answered
Histogram x axis tick labels – string
Hack the final xticklabel x = randn(1e5,1); x= x-min(x)+1; histogram(log(x)) xlim([0,3]) xt = xticklabels; xt{end} = 'oth...

2 mesi ago | 1

Answered
solving a very complicated equation implicitly
A quick answer is you probably need to dot-divide (./) the term with the (vector) rpf. 2nd point. Because I used a root finder...

2 mesi ago | 0

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