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Paulo Silva


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

circa 9 anni fa | 0

| accettato

Risposto
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...

circa 9 anni fa | 0

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

quasi 10 anni fa | 0

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

oltre 12 anni fa | 0

| accettato

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

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 1

Risposto
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 ...

oltre 12 anni fa | 0

| accettato

Risposto
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]); ...

oltre 12 anni fa | 1

Risposto
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...

oltre 12 anni fa | 0

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

oltre 12 anni fa | 2

Risposto
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))

oltre 12 anni fa | 1

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

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 1

Risposto
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...

oltre 12 anni fa | 1

Risposto
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';); ...

oltre 12 anni fa | 0

Risposto
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;...

oltre 12 anni fa | 1

| accettato

Risposto
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...

oltre 12 anni fa | 0

| accettato

Risposto
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...

oltre 12 anni fa | 1

Risposto
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)

oltre 12 anni fa | 0

Risposto
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 ...

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 0

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

oltre 12 anni fa | 0

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

oltre 12 anni fa | 0

| accettato

Risposto
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); ...

oltre 12 anni fa | 0

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

oltre 12 anni fa | 0

Risposto
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...

oltre 12 anni fa | 0

| accettato

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

oltre 12 anni fa | 0

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