Community Profile # David Franco

### Federal University of Tocantins

30 total contributions since 2014

Industrial Engineer from the Pontifical Catholic University of Paraná (2008/2012) and Master in Production and Systems Engineering also from the Pontifical Catholic University of Paraná (2013/2015). PhD in Production and Systems Engineering at Pontifical Catholic University of Paraná (2015/2019). Works in the area of Production Engineering, with emphasis on Operations Research, sub-areas: Modeling, Analysis and Simulation of Productive Systems; Decision-making processes; Time Series Analysis and Forecasting; Intelligent Systems (Artificial Neural Networks); Mathematical Programming and Optimization (Linear, Integer, Mixed and Non-Linear Programming; Global Optimization: Genetic Algorithms, Simulated Annealing, Tabu Search, Direct Search, Multiobjective Optimization, Swarm Optimization, among other techniques); and Data Mining (Big Data).

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How Matlab calculate the centroid of a polyshape?
From http://paulbourke.net/geometry/polygonmesh/: Where:

2 months ago | 0

| accepted

Question

How Matlab calculate the centroid of a polyshape?
I am using the centroid command to find the centroids of polyshapes, but on the documentation I didn't find how Matlab calculate...

2 months ago | 1 answer | 0

### 1

Question

How to detect a dark color in RGB triplet?
I am plotting a map with many subdivision and colors. I would like to automatically draw the borders with contrasting color wit...

2 months ago | 1 answer | 0

### 1

Question

How to partition (discretize) the space around points using Voronoi Diagram?
I have a problem: The plot shows a 399 cities locations and the Voroni Diagram (in latitude and longitude coordinates). The qu...

2 months ago | 1 answer | 1

### 1

Question

How can I convert a shapefile boundaries to lat and lon?
I have a shapefile of counties subdivisions (Paraná State, Brazil) and I would like to extract an array of bounding lat and lon ...

2 months ago | 0 answers | 0

### 0

How to calculate the Euclidean distance beetwen all points of Latitude Longitude pairs?
function [d1,d2] = pos2dist(point1,point2) % Distance: % d1: distance in km based on Haversine formula % d2: distance in km b...

2 months ago | 0

| accepted

Question

How to calculate the Euclidean distance beetwen all points of Latitude Longitude pairs?
I have a 399 cities array with LON LAT coordinates (first column for the Longitudes), like the picture below. How can I calcu...

2 months ago | 1 answer | 0

### 1

Question

Better “centerpoint” than centroid of a concave polygon
I'm using the centroid of polygons to attach a marker in a map application. This works definitely fine for convex polygons and ...

3 months ago | 2 answers | 0

### 2

Question

How to find a figure's centroid inside a polyshape?
I have the following problem: I am plotting the boundaries of several municipalities and I need to list each one. As there are...

4 months ago | 1 answer | 0

### 1

Question

How to plot text in mapshow map
I have this map I made using mapshow function: I used the data in this structure to create the map: My function is (I ne...

10 months ago | 0 answers | 0

### 0

Question

Mathematical formulation of a operations research problem
How can I implement this objective function and its constraints in Matlab (p-median problem)? Thank you very much!

10 months ago | 1 answer | 0

### 1

Submitted

Quantum-Behaved Particle Swarm Optimization
The Q-PSO function + 11 benchmark functions. Submitted

Gaussian Quantum-Behaved Particle Swarm Optimization
The Gaussian Q-PSO function + 11 benchmark functions + original article. Submitted

CLONALG - Clonal Selection Algorithm for Optimization Problems
Clonal Selection Algorithm for Minimization Problems Question

How to plot the content of a Structure without using a for loop?
I need to plot the content of a *_structure_* fiel: <</matlabcentral/answers/uploaded_files/111837/Capture.PNG>> Each ...

2 years ago | 1 answer | 0

### 1

Submitted

Elastic Distortion Transformation on an image
Expanding Data Sets through Elastic Distortions Question

Neural Network - How to use a custom training function
Is it possible to replace standard matlab training methods (like _*Gradient Descent*_, *_Levenberg-Marquardt_*, etc.) by other m...

2 years ago | 2 answers | 0

### 2

How can I plot a confusion matrix for a multi-class or non-binary classification problem?
Implementation code: Confusion Matrix function [] = confusion_matrix(T,Y) M = size(unique(T),2); N = size(T,2)...

2 years ago | 1

How can I vectorize a function?
Because of the above problems I'm using my own function with *|surfc|* to replace *|fsurf|*: function z = plotfcn(fcn,range...

2 years ago | 0

Difference between fsurf and ezsurf
*MathWorks' Support Response:* I have been able to reproduce the slow down that you were experiencing. The *|fsurf|* function...

2 years ago | 0

| accepted

Question

Difference between fsurf and ezsurf
I have a problem with |*fsurf*| command: When I use fsurf(@(x,y) ackleyfcn([x,y]),[-32 32 -32 32]) I got this warning...

2 years ago | 2 answers | 1

### 2

Question

How can I vectorize this function with nested FOR loop?
The function is: x = -10:10; y = -5:5; for j = 1:21 for i = 1:11 f(i) = - 20 * exp( - 0.2 * sqr...

2 years ago | 2 answers | 0

### 2

Question

How can I vectorize a function?
The function I want to vectorize is *Cross-in-Tray Function* (2-D): f(X,Y) = -0.0001*(abs(sin(X)*sin(Y)*exp(abs(100-sqrt(X^...

2 years ago | 2 answers | 0

### 2

Question

How to use Neural Network Error as a Feedback Input
Using neural network error as a feedback input helps reduce the overall network error and increase forecasting accuracy ( _Wahhe...

2 years ago | 2 answers | 0

### 2

Question

Optimization of hidden layer dimension in neural network (number of neurons)
*I am using GA optimization to train my neural network (to try to find the best weights set):* % Neural Network trained by ...

2 years ago | 1 answer | 0

### 1

How to calculate Akaike Information Criterion and BIC from a Neural Network?
After training the network and simulating the outputs: [net,tr] = train(net,inputs,targets); output = sim(net,inputs...

3 years ago | 2

Question

How to plot a contour USA map from a Shapefile
When I read my shapefile I get this attributes: S = shaperead('nsrdb_9814_dni_ovit.shp', 'UseGeoCoords', true) S =...

3 years ago | 0 answers | 1

### 0

Question

Before training my Neural Network I converted prices to returns (for stationarity). After training and forecasting N days ahead ...

3 years ago | 0 answers | 0

### 0

Neural network AIC and BIC calculation (number of parameters?)
After training the network and simulating the outputs: [net,tr] = train(net,inputs,targets); output = sim(net,inputs); ...

3 years ago | 6

Question

What is the difference between 'divideblock' and 'divideint'?
In Neural Network Toolbox, what is the difference between 'divideblock' and 'divideint'? net.divideFcn = 'divideblock'; ...

6 years ago | 1 answer | 0