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Paulo Silva


Active since 2010

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

más de 7 años ago | 0

| accepted

Answered
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...

más de 7 años ago | 0

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

más de 8 años ago | 0

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

casi 11 años ago | 0

| accepted

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

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 1

Answered
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 ...

casi 11 años ago | 0

| accepted

Answered
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]); ...

casi 11 años ago | 1

Answered
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...

casi 11 años ago | 0

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

casi 11 años ago | 2

Answered
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))

casi 11 años ago | 1

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

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 1

Answered
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...

casi 11 años ago | 1

Answered
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';); ...

casi 11 años ago | 0

Answered
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;...

casi 11 años ago | 1

| accepted

Answered
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...

casi 11 años ago | 0

| accepted

Answered
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...

casi 11 años ago | 1

Answered
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)

casi 11 años ago | 0

Answered
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 ...

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 0

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

casi 11 años ago | 0

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

casi 11 años ago | 0

| accepted

Answered
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); ...

casi 11 años ago | 0

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

casi 11 años ago | 0

Answered
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...

casi 11 años ago | 0

| accepted

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

casi 11 años ago | 0

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