Paulo Silva

Con actividad desde 2010

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Just done my Masters degree in Control and Industrial Electronics, I also have one licenciates degree in Electrical Engineering and Computer Science.

I love to use MATLAB and to help others using it, everyday I learn something new.

Currently teaching and supporting students with several projects that use MATLAB for Biomedical Imaging.

Please don't send me emails asking for code or help, I will only help the best I can here at MATLAB Answers.
Professional Interests: Control engineering, biking, growing organic food, permaculture student (nature is my teacher)

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Respondida
Exponential transfer function
<http://www.mathworks.com/help/control/ug/models-with-time-delays.html Models with time delays>

alrededor de 9 años hace | 0

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Respondida
Looking for example code for Minimum Variance Control Systems
<http://www.amazon.com/Computer-Controlled-Systems-Theory-Electrical-Engineering/dp/0486486133/ref=sr_1_1?s=books&ie=UTF8&qid=14...

alrededor de 9 años hace | 0

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Getappdata and setappdata
<http://blogs.mathworks.com/videos/2011/11/23/passing-data-between-guide-callbacks-without-globals-in-matlab/ Passing data betwe...

casi 10 años hace | 0

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Draw polar curves
t=0:0.01:2*pi; polar(t,abs(sin(t/2).*cos(t/2)));

más de 12 años hace | 0

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Simulink bit operations
[1 0]------>Gain(-1)----->[-1 0] Use the Gain block and define that gain as -1

más de 12 años hace | 0

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Generate Square Wave
Here's my crazy way to do it, I'm assuming some values for example the sampling time. This way doesn't require any toolboxes, an...

más de 12 años hace | 1

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Transfer Function in Simulink
Use those variables (a and b) in the simulation, define them in the workspace with default values before the simulation starts ...

más de 12 años hace | 0

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multiple bode plots on same graph
Maybe something with *hold on*?! g = tf([1 0.1 7.5],[1 0.12 9 0 0]); bode(g) hold on g = tf([1],[1 0.12 9 0 0]); ...

más de 12 años hace | 1

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vectors from array
a=randi(5,3,5) %sample array %put all columns of the array in diferent cells b=arrayfun(@(x)a(:,x),1:size(a,2),'un...

más de 12 años hace | 0

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Reset button
set(findobj(0,'style','edit'),'string','') %put this in the button callback %that should clear all edit uicontrols or s...

más de 12 años hace | 2

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Repetition of rows of a matrix maintaining the number of columns
A=[ 1 2 3 4 5 6] N=1; %number of repeats kron(A,ones(N+1,1))

más de 12 años hace | 1

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Frequence of the signal
From the MATLAB documentation of the fft function: Fs = 1000; % Sampling frequency T = 1/Fs; ...

más de 12 años hace | 0

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compute number of pulses for ECG signal
Find the number of peaks with the Signal Processing Toolbox™ *findpeaks* function or one similar function from the <http://www.m...

más de 12 años hace | 0

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MATLAB - Stop execution of .m file while Simulink is running
Use the Simulink *sim* function instead to start the simulation, that way after the simulation is over the code continues execut...

más de 12 años hace | 1

Respondida
How to divide and times in matlab
1/sqrt(R^2+(w*L-1/(w*C))^2) if perhaps you are working with arrays or vectors and you want the operations to be performed ele...

más de 12 años hace | 1

Respondida
Are you convert matlab code to visual basic code form for me, please?
clc,clear all x = 0:0.2:1; % get a dimensional array of real number type fid = fopen('dene3.txt','w';); ...

más de 12 años hace | 0

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finding a mathematical function that passes from specified points
x=[10 30 50 100 125 250 350 500 550 750 1000]; y=[91 92 93.2 93.5 94 95.2 95.4 95.1 95 94.5 93.8]; plot(x,y,'o') n=8;...

más de 12 años hace | 1

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Comparing two matrices, and acting upon the result element by element.
A=randi(5,3,3) B=10*randi(5,3,3)+5 v=2 %your specific value A(A==v)=B(A==v) %replace elements of A equal t...

más de 12 años hace | 0

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Using Figure
doc subplot example t=0.01:0.01:1; x=rand(100,2); subplot(211) plot(t,x(:,1),'red','linewidth',2 ) xlabel('Time (s...

más de 12 años hace | 1

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how do I reshape an array into a matrix that has dimensions of (user indicated number) by 4?
parameter =[1 2 3 4 1 2 3 4 1 2 3 4] reshape(parameter,4,3)

más de 12 años hace | 0

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Creating a distance matrix in Matlab?
On the Neural Network Toolbox™ you have the mandist function that seems to do what you need, if you don't have that toolbox try ...

más de 12 años hace | 0

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Matrix - empty selected cells
You might encounter problems when removing values from array because the dimensions must be consistent M = [ 1.23 1.34-4i 275...

más de 12 años hace | 0

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Create Labview/Simulink like environment with GUIDE?
I'm not familiar with Labview but I made several GUI's that control Simulink simulations, you can have something like this <http...

más de 12 años hace | 0

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Help needed displaying multiple plots (and maybe preassigning too)
doc hold %allows you to have more than one plot on a axes doc subplot %if you want more than one axes on a figure <ht...

más de 12 años hace | 0

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output
A=[20 30 40 50] MATLAB index values start at 1 not 0

más de 12 años hace | 0

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Detect P-code
Maybe this: a=dbstack('-completenames'); if (isempty(strfind(a.file,'.m'))) disp('pcode') else disp('mfile') ...

más de 12 años hace | 0

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In an assignment A(I) = B, the number of elements in B and I must be the same.
syms t x=-3:.1:3; for i=1:length(x); Pin=3*exp(-t^2); z=x(i); Eo(i)=int(Pin,t,-inf,z); ...

más de 12 años hace | 0

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Return the number of rows of an array of cell data
doc cellfun

más de 12 años hace | 0

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Expression (equation)
Simplest version I can think of t=0:0.1:100; % Time vector A=0.1; % Value of A that you can c...

más de 12 años hace | 0

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problem in using symbols
doc vpa %just a wild guess of something that might be useful to you

más de 12 años hace | 0

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