Jose Marques

Petrobras / UFSJ

Last seen: 2 years 前 | 自 2017 起处于活动状态

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Youtube channel: https://www.youtube.com/channel/UC2WovW85lxhSQndD97lPaSA

统计学

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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...

6 years 前 | 1 个回答 | 0

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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...

6 years 前 | 1 个回答 | 0

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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...

6 years 前 | 1 个回答 | 0

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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 ...

6 years 前 | 1 个回答 | 0

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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!...

6 years 前 | 0 个回答 | 0

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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 ...

6 years 前 | 0 个回答 | 0

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How 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>

7 years 前 | 0

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Applying Threshold to Video Pixels
Try to transform the image in a double matrix. readFrame gives a uint8 output.

7 years 前 | 0

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Matlab cannot recognize kinect
Hello. I tested Kinect at several MATLAB versions. Just work in MATLAB 2013.

7 years 前 | 0

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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...

7 years 前 | 0

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Custom neural network - input mismatch
Please, verify the order of elements. Maybe you can try to transposte the inputs matrix.

7 years 前 | 0

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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...

7 years 前 | 0

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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...

7 years 前 | 0

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How to solve Index exceeds matrix dimensions?
Have you verify the size of the images? They must be the same.

7 years 前 | 0

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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...

7 years 前 | 0

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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...

7 years 前 | 0

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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 ...

7 years 前 | 2 个回答 | 0

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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.

7 years 前 | 0 个回答 | 0

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Unexpected 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...

7 years 前 | 0

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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...

7 years 前 | 1

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已回答
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...

7 years 前 | 0

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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...

7 years 前 | 0

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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...

7 years 前 | 0

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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...

7 years 前 | 0

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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.

7 years 前 | 0

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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...

7 years 前 | 0

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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...

7 years 前 | 0

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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...

7 years 前 | 0

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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 ...

7 years 前 | 0

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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; ...

7 years 前 | 2

| 已接受

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Jose Marques

Petrobras / UFSJ

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