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Jose Marques


Petrobras / UFSJ

Last seen: 2 years ago |  Active since 2017

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

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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...

6 years ago | 1 answer | 0

1

answer

Question


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 ago | 1 answer | 0

1

answer

Question


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 ago | 1 answer | 0

1

answer

Question


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 ago | 1 answer | 0

1

answer

Question


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 ago | 0 answers | 0

0

answers

Question


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 ago | 0 answers | 0

0

answers

Answered
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 ago | 0

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

7 years ago | 0

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

7 years ago | 0

Answered
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 ago | 0

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

7 years ago | 0

Answered
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 ago | 0

Answered
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 ago | 0

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

7 years ago | 0

Answered
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 ago | 0

Answered
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 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 ...

7 years ago | 2 answers | 0

2

answers

Question


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 ago | 0 answers | 0

0

answers

Answered
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 ago | 0

| accepted

Answered
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 ago | 1

| accepted

Solved


Side of an equilateral triangle
If an equilateral triangle has area A, then what is the length of each of its sides, x? <<http://upload.wikimedia.org/wikipe...

7 years ago

Solved


Length of a short side
Calculate the length of the short side, a, of a right-angled triangle with hypotenuse of length c, and other short side of lengt...

7 years ago

Solved


Side of a rhombus
If a rhombus has diagonals of length x and x+1, then what is the length of its side, y? <<http://upload.wikimedia.org/wikipe...

7 years ago

Solved


Area of an equilateral triangle
Calculate the area of an equilateral triangle of side x. <<http://upload.wikimedia.org/wikipedia/commons/e/e0/Equilateral-tr...

7 years ago

Solved


Dimensions of a rectangle
The longer side of a rectangle is three times the length of the shorter side. If the length of the diagonal is x, find the width...

7 years ago

Solved


Area of an Isoceles Triangle
An isosceles triangle has equal sides of length x and a base of length y. Find the area, A, of the triangle. <<http://upload...

7 years ago

Solved


Find a Pythagorean triple
Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

7 years ago

Solved


Is this triangle right-angled?
Given three positive numbers a, b, c, where c is the largest number, return *true* if the triangle with sides a, b and c is righ...

7 years ago

Solved


Triangle sequence
A sequence of triangles is constructed in the following way: 1) the first triangle is Pythagoras' 3-4-5 triangle 2) the s...

7 years ago

Solved


Length of the hypotenuse
Given short sides of lengths a and b, calculate the length c of the hypotenuse of the right-angled triangle. <<http://upload....

7 years ago

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