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.
Programming Languages:
Python, C++, C, MATLAB
Spoken Languages:
English, French, Spanish
Professional Interests:
Control Systems, Physics, Engineering, Renewable Energy
Python, C++, C, MATLAB
Spoken Languages:
English, French, Spanish
Professional Interests:
Control Systems, Physics, Engineering, Renewable Energy
統計
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Awarded to David Sanchez on 16 Jun 2022
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Awarded to David Sanchez on 20 Jul 2017
Answer 1 question that was unanswered for more than 30 days
Awarded to David Sanchez on 20 Jul 2017
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Awarded to David Sanchez on 20 Jul 2017
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Awarded to David Sanchez on 20 Jul 2017
Solve a problem for the first time
Awarded to David Sanchez on 22 May 2015
Feeds
回答済み
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 ...
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 ...
2年以上 前 | 0
回答済み
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 ...
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 ...
3年弱 前 | 0
| 採用済み
回答済み
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...
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...
3年弱 前 | 0
| 採用済み
回答済み
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 (...
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 (...
3年弱 前 | 0
回答済み
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...
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...
3年弱 前 | 0
| 採用済み
回答済み
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: ...
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: ...
5年以上 前 | 1
| 採用済み
回答済み
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/...
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/...
5年以上 前 | 0
| 採用済み
回答済み
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 ...
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 ...
8年以上 前 | 0
回答済み
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 ...
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 ...
8年以上 前 | 1
| 採用済み
回答済み
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 ...
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 ...
8年以上 前 | 0
回答済み
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...
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...
9年弱 前 | 0
| 採用済み
回答済み
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_...
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_...
9年弱 前 | 1
回答済み
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...
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...
9年弱 前 | 1
| 採用済み
回答済み
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; ...
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; ...
約9年 前 | 0
回答済み
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 ...
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 ...
9年以上 前 | 0
回答済み
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...
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...
9年以上 前 | 0
| 採用済み
回答済み
changing names of files
% Renaming a File in the Current Folder % In the current folder, rename oldname.m to newname.m: % movefile('oldname.m','...
changing names of files
% Renaming a File in the Current Folder % In the current folder, rename oldname.m to newname.m: % movefile('oldname.m','...
9年以上 前 | 0
回答済み
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...
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...
9年以上 前 | 0
回答済み
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...
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...
9年以上 前 | 0
回答済み
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 ...
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 ...
9年以上 前 | 0
回答済み
how can store multiple value in a matrix??
ncadre=15; nbclasse=1000; load('D:\Documents\MATLAB\classifieur1.mat'); load('D:\Documents\MATLAB\classifieur2.mat');...
how can store multiple value in a matrix??
ncadre=15; nbclasse=1000; load('D:\Documents\MATLAB\classifieur1.mat'); load('D:\Documents\MATLAB\classifieur2.mat');...
9年以上 前 | 0
| 採用済み
回答済み
Efficient Frontier code error
Watch the last line of code: print portfolio03.ps - deps ; Mind the blank space right before deps simply delete it: ...
Efficient Frontier code error
Watch the last line of code: print portfolio03.ps - deps ; Mind the blank space right before deps simply delete it: ...
9年以上 前 | 0
| 採用済み
回答済み
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...
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...
9年以上 前 | 0
回答済み
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 ...
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 ...
9年以上 前 | 1
| 採用済み
回答済み
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 ...
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 ...
9年以上 前 | 0
回答済み
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'); ...
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'); ...
9年以上 前 | 0
回答済み
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...
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...
9年以上 前 | 0
回答済み
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);
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);
9年以上 前 | 0
| 採用済み
回答済み
Using Meshgrid for 3 variables
Make sure the size of d is right: If length(a) = n and length(L) = m, then, you have to have size(d) = [m x n] for example...
Using Meshgrid for 3 variables
Make sure the size of d is right: If length(a) = n and length(L) = m, then, you have to have size(d) = [m x n] for example...
9年以上 前 | 0
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