# David Franco

### Federal University of Tocantins

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).

**Programming Languages:**

MATLAB

**Spoken Languages:**

English, Portuguese, Spanish

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**Content Feed**

Domanda

Do I need to differentiate ARIMA model input data?

If my ARIMA model is (1,1,1), do I need to differentiate the data before inserting it into the model? sys = arima(1,1,1); Md1 ...

oltre un anno fa | 0 risposte | 0

### 0

risposteDomanda

Surrogate optimization with different size constraints

I have this problem for optimization (22-dimensional): Min sum(t1/x1,t2/x2,...,t22/x22) Subject to: x1 + x2 + ... + x22 -140...

circa 2 anni fa | 1 risposta | 0

### 1

rispostaDomanda

Why is the Neural Network training slow when I don't use the Matlab Toolbox?

I am trying to optimize neural weights using the standalone Levenberg-Marquard algorithm, but the ANN training is much slower th...

circa 2 anni fa | 0 risposte | 0

### 0

risposteHow can I use the trained weights of a neural network

I found the answer (output and yy are equal): % Simulated a Neural Network clear close clc rng default [x,y] = sim...

circa 2 anni fa | 0

| accettato

How to use weights and bias from Neural Network Toolbox for classification

I found the answer (output and yy are equal): % Simulated a Neural Network clear close clc rng default [x,y] = sim...

circa 2 anni fa | 0

| accettato

Domanda

How can I use the trained weights of a neural network

How can I use the trained weights of a neural network to simulate the output of a classification problem?

circa 2 anni fa | 1 risposta | 0

### 1

rispostaDomanda

Matlab returns which epoch's weights of a Neural Network training?

If I trained my Neural Network until 10 iterations and my best validation epoch is 3, Matlab will return the weights from the 10...

oltre 2 anni fa | 0 risposte | 0

### 0

rispostei want to train neural network with nntool but input and target size donot match error occur

The input and targets must be 4x81 and 1x81. Use the transpose function.

oltre 2 anni fa | 0

Which epoch is the training result of the train function

For a shallow neural network you can use the code: net.trainParam.max_fail = x where x is the number of fails in increase the ...

oltre 2 anni fa | 0

Domanda

How to use weights and bias from Neural Network Toolbox for classification

I found a code in Matlab Answers for regression: x = 0:0.1:10; % input dimension 1x101 y = sin(x); % output dimension 1x101 ...

oltre 2 anni fa | 1 risposta | 0

### 1

rispostaHow Matlab calculate the centroid of a polyshape?

From http://paulbourke.net/geometry/polygonmesh/: Where:

oltre 2 anni fa | 0

| accettato

Domanda

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...

oltre 2 anni fa | 1 risposta | 0

### 1

rispostaDomanda

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...

oltre 2 anni fa | 1 risposta | 0

### 1

rispostaDomanda

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...

oltre 2 anni fa | 1 risposta | 1

### 1

rispostaDomanda

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 ...

oltre 2 anni fa | 1 risposta | 0

### 1

rispostaHow 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...

oltre 2 anni fa | 0

| accettato

Domanda

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...

oltre 2 anni fa | 1 risposta | 0

### 1

rispostaDomanda

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 ...

oltre 2 anni fa | 4 risposte | 0

### 4

risposteDomanda

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...

oltre 2 anni fa | 2 risposte | 0

### 2

risposteDomanda

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...

circa 3 anni fa | 0 risposte | 0

### 0

risposteDomanda

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!

circa 3 anni fa | 2 risposte | 0

### 2

risposteDomanda

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 ...

oltre 4 anni fa | 1 risposta | 0

### 1

rispostaDomanda

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...

oltre 4 anni fa | 2 risposte | 0

### 2

risposteHow 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)...

oltre 4 anni fa | 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...

circa 5 anni fa | 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...

circa 5 anni fa | 0

| accettato

Domanda

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...

circa 5 anni fa | 2 risposte | 1

### 2

risposteDomanda

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...

circa 5 anni fa | 2 risposte | 0

### 2

risposteDomanda

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^...

circa 5 anni fa | 2 risposte | 0

### 2

risposteDomanda

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...

circa 5 anni fa | 2 risposte | 0