Jose Marques
Petrobras / UFSJ
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Youtube channel: https://www.youtube.com/channel/UC2WovW85lxhSQndD97lPaSA
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Accept 2 answers given by other contributors
Awarded to Jose Marques on 15 Feb 2022
10 of your answers have been accepted
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Accept 1 answer given by other contributors
Awarded to Jose Marques on 26 Jan 2018
Solve all the problems in CUP Challenge
Awarded to Jose Marques on 10 Sep 2017
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Feeds
Question
How to select the number of samples to train a Machine Learning algorithm?
I working in a dataset of 12000 samples concerning about 5 years of an industrial process. It is likely that during this ti...
meer dan 5 jaar ago | 1 answer | 0
1
answerQuestion
Error when trying to do 'Hyperparameter Optimization' using Parallel Computing
Hello, I am trying to optimize the function fitrsvm. But when I set 'true' to the 'UseParallel' property, I am getting a e...
bijna 6 jaar ago | 1 answer | 0
1
answerQuestion
PI (Plant Information) system from OSIsoft integration
Does anyone already integrated the PI (plant information) system (PIMS of OSIsoft) with MATLAB? I intend to use the Machine Lear...
meer dan 6 jaar ago | 1 answer | 0
1
answerQuestion
Setting the best training / validation ratio in a Neural Network
I am using a Neural Network to make a regression, using 10% of data to test. But how can I set the ratio values of training and ...
meer dan 6 jaar ago | 1 answer | 0
1
answerQuestion
100% precision in training set with SVM classifier
<</matlabcentral/answers/uploaded_files/108243/Gr%C3%A1fico%20treinamento%20com%20e%20sem%20ru%C3%ADdo%20_%20mao.png>> Hello!...
meer dan 6 jaar ago | 0 answers | 0
0
answersQuestion
Clustering and feedforwardnet giving always the same result
Hello! I am having some problems with clustering and feedforwardnet. The idea is compare these methods and improve the accuracy ...
meer dan 6 jaar ago | 0 answers | 0
0
answersHow to display multiple images side by side and on top/bottom of each other?
Try to use subplot. <https://www.mathworks.com/help/matlab/ref/subplot.html>
meer dan 6 jaar ago | 0
Applying Threshold to Video Pixels
Try to transform the image in a double matrix. readFrame gives a uint8 output.
meer dan 6 jaar ago | 0
Matlab cannot recognize kinect
Hello. I tested Kinect at several MATLAB versions. Just work in MATLAB 2013.
meer dan 6 jaar ago | 0
Using a while loop to determine and display the number of terms it takes for a given series to converge within 0.01% of its exact value ((pi^2)/6)?
In the first iteration, seem that nn == 0 and nn_sum == (1/nn^2) which means a zero division. Maybe you can include a if stateme...
bijna 7 jaar ago | 0
Custom neural network - input mismatch
Please, verify the order of elements. Maybe you can try to transposte the inputs matrix.
bijna 7 jaar ago | 0
How to find a symbolic derivative?
Use diff function: syms f(x) f(x) = sin(x^2); df = diff(f,x) Result: df(x) = 2*x*cos(x^2) <https://www.m...
bijna 7 jaar ago | 0
I do not have any licenses associated with your MathWorks Account.
You can use this version. It is a free Matlab Trial for 30 days. <https://www.mathworks.com/programs/trials/trial_request.htm...
bijna 7 jaar ago | 0
How to solve Index exceeds matrix dimensions?
Have you verify the size of the images? They must be the same.
bijna 7 jaar ago | 0
Separating Connected Objects Effectively in Image
Hello. Have you tried "imopen"? <https://www.mathworks.com/help/images/ref/imopen.html> Please, post your code and figures...
bijna 7 jaar ago | 0
How to know the response time of a system in simulink?
For the response to a step input: step(sys); For the response to a ramp input: ramp(sys); where sys is the syste...
bijna 7 jaar ago | 0
Question
Missing properties of Kinect 360 V1 Matlab 2017a - no TrackingMode, no Skeleton
Hello evereyone! Has anyone used the Kinect 360 v1 in Matlab R2017a? I have some troubles connecting Kinect 360 V1 with ...
bijna 7 jaar ago | 2 answers | 0
2
answersQuestion
Has anyone used the Kinect 360 v1 in Matlab R2017a?
It just appears few properties when I try to communicate with Matlab R2017a. The Kinect v1 works fine with the Matlab R2013a.
bijna 7 jaar ago | 0 answers | 0
0
answersUnexpected Matlab Expression ?
Natalie, try this: E= [-1 1] * 3 *( exp (1) .^ ((-x)/4)) E will be a matrix 1x2 that first element is positive value and...
bijna 7 jaar ago | 0
| accepted
Deleting sequence of igual values from a matrix
Hello Felipe. Try this: A = [0 0 0 1 1 1 2 2 2 3 3 3, 0 1 2 2 3 4 5 6 7 8 9 10]; [C, ia, ic] = unique(A(1,:)); C...
bijna 7 jaar ago | 1
| accepted
For loop question of Iteration
Hello, KACPER PAWLOWSKI. You can see the values in each iteration. After each iteration, you must press enter to continue to nex...
bijna 7 jaar ago | 0
Plot Matrix Columns in a Loop
Hello, Jacqueline Kpognon. Do you want to differents figures? Try this: pos = find(y==1); neg = find(y==0); plo...
bijna 7 jaar ago | 0
Question about initial movement of inverted pendulum
Maybe the force is not being applied in the gravity center. So a momentum will be generate, rotating the body. Some parts of th...
bijna 7 jaar ago | 0
How to convert binary number to decimal integer?
Hello. Maybe this can be helpfull for you <https://www.mathworks.com/matlabcentral/answers/98649-how-can-i-convert-a-negat...
bijna 7 jaar ago | 0
I am trying to plot a Gaussian normal probability density function with 500 points, mean=1.5 standard deviation 0.5. The Below is my code. My code doesn't have a error but the plot is not accurate.
Hello Sam. I used: Y = normpdf(x,m,s) and give the same result. Seems that is correct.
bijna 7 jaar ago | 0
| accepted
Replacing Values of a Larger Matrix with that of a Smaller Matrix
imgSiz = [x1,y1]; blkSiz = [x1,size_column]; numRep = imgSiz./blkSiz; basMat = toeplitz(mod(0:numRep(1)-1,2),mod(0:nu...
bijna 7 jaar ago | 0
How to Create Alternating Black Columns Across an Image?
Hello Richard! You can try this: size_of_column = 16; img = imread('image_exemple.jpg'); imshow(img); mask = ze...
bijna 7 jaar ago | 0
| accepted
How to do a convolution for n samples starting from n=0 ?
Hello Jucimar. You can try this: x = [-1 0 1]; h = [0.5 0.25 0 0.125]; w = conv(x,h) w = Columns 1 through...
bijna 7 jaar ago | 0
| accepted
How to plot a circle of some radius on a polar plot, when the circle is not centered in the origen?
Hello Gabriel Malagon Carvajal. You can try this: %k is a constant that you can difine as the circles size k = 0.4 %a ...
bijna 7 jaar ago | 0
How to crop square of size 100 X 100 around the centroid of an image?
Change x_cent and y_cent for your centroids; change the name of images variables x_cent = 120; y_cent = 150; ...
bijna 7 jaar ago | 2
| accepted
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