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David Sanchez


738 total contributions since 2013

Physicist, working as control engineer for a wind turbine manufacturer.
Professional Interests: control,optimization, computer vision, robotics, renewable energies.

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Answered
Cut Sinusoidal signal in a integer number of periods
Hi, bear in mind that the sampling of your curve might play an important role in the game. The code below might help you out: ...

13 days ago | 0

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Answered
State observer bode plot
Hi, I'm sure that you can find an example similar to your problem in the Bode documentation: https://mathworks.com/help/ident/...

13 days ago | 0

| accepted

Answered
How I can split a matrix in four matrixes
M = rand(1001,3); % your matrix L = size(M,1); % L = number of rows n = floor(L/4); % number of rows for your matrices ...

3 years ago | 0

Answered
Respected sir, i have code for extracting ROI from dorsal hand image, my problem is to read and save multiple images from folder. in following code only single image has read and save but i want multiple images to read and save please help me.
Hi, firstly, your way of asking the question does not make it easy to help you. Your code presentation is really annoying, but ...

3 years ago | 1

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Answered
Saving a file with name of reference of other file name ?
Hi, it all depends on how the user introduces the *.stl file name, but taking for granted that the name is somehow available to ...

3 years ago | 0

Answered
I have a 6000x9424x50 matrix and want to convert it into 6000x9424x10 and 6000x9424x20?? I meant to to split 50 bands to 10 or 20 bands individually?
your_matrix = rand(6000,9424,50); % random matrix M_10 = your_matrix(:,:,1:10); % 10 bands M_20 = your_matrix(:,:,11...

3 years ago | 0

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Answered
How do I index within a structure?
% dummy struct your_struct.field_1 = rand(5,1); your_struct.field_2 = rand(5,1); % array with field-mean your_...

3 years ago | 1

Answered
Set image roi to zero
If _I_ is your image I(201:210,201:210) = 0;

3 years ago | 0

Answered
Clean way to find which elements of categorical array are part of a set of labels
I think you are looking for this: data = {'a', 'b', 'c', 'b', 'a'} ; members = {'a','b'}; ismember(data,membe...

3 years ago | 1

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Answered
How do I ajust the vallues the X-axis of a mesh (Z,Y,X) plot?
hi, adjust this example to your needs: [X,Y] = meshgrid(-8:.5:8); R = sqrt(X.^2 + Y.^2) + eps; Z = sin(R)./R; ...

4 years ago | 0

Answered
Apply code on matlab files in different directories ?
From Documentation: path(path,'newpath') adds the newpath folder to the end of the search path. If newpath is already on the ...

4 years ago | 0

Answered
How to execute fft and ifft
Hi thereb, the sine wave is right there, but the problem is that after FFTing the your _y_ data, _YfreqD_ contains half the sam...

4 years ago | 0

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Answered
changing names of files
% Renaming a File in the Current Folder % In the current folder, rename oldname.m to newname.m: % movefile('oldname.m','...

4 years ago | 0

Answered
the code wont display an answers calculated
Hi there, after reordering your code, I saw it follows this structure: method=='f' --> n= 1,2,3,other_value meth...

4 years ago | 0

Answered
Adding phase noise in simple signal
Hello Kutru, I do not know exactly what were you expecting to find in your plots. The difference in your plots is only the nois...

4 years ago | 0

Answered
The expression to the left of the equals sign is not a valid target for an assignment.
You are using the notation used by numeric::int instead of that to int Take a look at their differences in the ...

4 years ago | 0

Solved


Add two numbers
Given a and b, return the sum a+b in c.

4 years ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

4 years ago

Solved


Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

4 years ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

4 years ago

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

4 years ago

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

4 years ago

Answered
how can store multiple value in a matrix??
ncadre=15; nbclasse=1000; load('D:\Documents\MATLAB\classifieur1.mat'); load('D:\Documents\MATLAB\classifieur2.mat');...

4 years ago | 0

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Answered
Efficient Frontier code error
Watch the last line of code: print portfolio03.ps - deps ; Mind the blank space right before deps simply delete it: ...

4 years ago | 0

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Answered
error in working with cell array
hi, transform C into a matrix before concatenating A, B and C in result: C = cell2mat(C); result={A; B; C}; mydat...

4 years ago | 0

Answered
How to replace data in a matrix by comparing from another matrix?
for k=1:length(B) x = A(:,1)==B(k,1); B(k,2) = A(x,2); end B = 1 5 ...

4 years ago | 1

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Answered
How do I loop through incrementally changing values
alpha = 1:0.5:20; a = 0.1+3*10^-3 * alpha.^2; b = 0.2+0.1*alpha - (3*10^-3)*(alpha.^2); c = 1./tan(-a./b); % I don't ...

4 years ago | 0

Answered
Good way to import data file
I'm sure this might be shorter, but I guess it'll be a valid solution for you: fid = fopen('your_file_name_here.txt'); ...

4 years ago | 0

Answered
how to select particular cell in the cell array and particular column in that cell array
You have to add new values to old ones: % initialize your data (I do it with empty array to make it easy) X0 = []; Y0...

4 years ago | 0

Answered
How do I find the two smallest values in varargin?
function out = two_lowest_values(varargin) a = sort(cell2mat(varargin)); out = a(1)*a(2);

4 years ago | 0

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