David Sanchez
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Physicist, working as control engineer for a wind turbine manufacturer. Professional Interests: control,optimization, computer vision, robotics, renewable energies.
Python, C++, C, MATLAB
Spoken Languages:
English, French, Spanish
Professional Interests:
Control Systems, Physics, Engineering, Renewable Energy
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MATLAB Central Treasure Hunt finisher badge
Awarded to David Sanchez on 16 Jun 2022
Contribute at least one answer each month for 12 consecutive months
Awarded to David Sanchez on 20 Jul 2017
Answer 1 question that was unanswered for more than 30 days
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Feeds
why is it not plotting or graph? it comes out blank
Hi there, if you run your code by blocks, after finishing the first while loop, you end up having: x = 0 0.5000 ...
más de 2 años hace | 0
Resuelto
Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...
más de 2 años hace
Create a plot with values from matrices of many dimensions.
Hi Stelios, it seems you are trying to plug 4D matrices into the surfc function, and as you mention: surfc: "Value must be a ...
casi 3 años hace | 0
| aceptada
How to save data in for loop to excel
Hi Jidapa, type in your matlab terminal doc xlswrite This will give you lots of information about how to do it. As an example...
casi 3 años hace | 0
| aceptada
Control systems failing to plot
Hi Daniel, your problem has definitely to do with your PC for sure. As you mention, the code works in your colleagues machines (...
casi 3 años hace | 0
i can not figure out what is wrong with my code,when i call my function it does show eny outpout
Hi Tasos, your nested "ff" conditions only contemplate cases for temp(i) equal to 10, 20, 30 or 40. When temp(i) is differente t...
casi 3 años hace | 0
| aceptada
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: ...
más de 5 años hace | 1
| aceptada
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/...
más de 5 años hace | 0
| aceptada
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 ...
más de 8 años hace | 0
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 ...
más de 8 años hace | 1
| aceptada
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 ...
más de 8 años hace | 0
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...
más de 8 años hace | 0
| aceptada
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_...
casi 9 años hace | 1
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...
casi 9 años hace | 1
| aceptada
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; ...
alrededor de 9 años hace | 0
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 ...
más de 9 años hace | 0
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...
más de 9 años hace | 0
| aceptada
changing names of files
% Renaming a File in the Current Folder % In the current folder, rename oldname.m to newname.m: % movefile('oldname.m','...
más de 9 años hace | 0
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...
más de 9 años hace | 0
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...
más de 9 años hace | 0
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 ...
más de 9 años hace | 0
Resuelto
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:...
más de 9 años hace
Resuelto
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 ...
más de 9 años hace
Resuelto
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 ...
más de 9 años hace
Resuelto
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...
más de 9 años hace
how can store multiple value in a matrix??
ncadre=15; nbclasse=1000; load('D:\Documents\MATLAB\classifieur1.mat'); load('D:\Documents\MATLAB\classifieur2.mat');...
más de 9 años hace | 0
| aceptada
Efficient Frontier code error
Watch the last line of code: print portfolio03.ps - deps ; Mind the blank space right before deps simply delete it: ...
más de 9 años hace | 0
| aceptada
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