# 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**

Question

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 ...

nästan 2 år ago | 0 answers | 0

### 0

answersQuestion

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...

mer än 2 år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än 2 år ago | 0 answers | 0

### 0

answersHow 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...

mer än 2 år ago | 0

| accepted

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...

mer än 2 år ago | 0

| accepted

Question

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?

mer än 2 år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än 2 år ago | 0 answers | 0

### 0

answersi 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.

mer än 2 år ago | 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 ...

mer än 2 år ago | 0

Question

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 ...

nästan 3 år ago | 1 answer | 0

### 1

answerHow Matlab calculate the centroid of a polyshape?

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

ungefär 3 år 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...

ungefär 3 år ago | 1 answer | 0

### 1

answerQuestion

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...

ungefär 3 år ago | 1 answer | 0

### 1

answerQuestion

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...

ungefär 3 år ago | 1 answer | 1

### 1

answerQuestion

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 ...

ungefär 3 år ago | 1 answer | 0

### 1

answerHow 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...

ungefär 3 år 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...

ungefär 3 år ago | 1 answer | 0

### 1

answerQuestion

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 ...

ungefär 3 år ago | 4 answers | 0

### 4

answersQuestion

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...

ungefär 3 år ago | 2 answers | 0

### 2

answersQuestion

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...

mer än 3 år ago | 0 answers | 0

### 0

answersQuestion

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!

mer än 3 år ago | 2 answers | 0

### 2

answersQuestion

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 ...

ungefär 5 år ago | 1 answer | 0

### 1

answerQuestion

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...

ungefär 5 år ago | 2 answers | 0

### 2

answersHow 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)...

ungefär 5 år 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...

ungefär 5 år 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...

ungefär 5 år 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...

ungefär 5 år ago | 2 answers | 1

### 2

answersQuestion

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...

ungefär 5 år ago | 2 answers | 0

### 2

answersQuestion

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^...

ungefär 5 år ago | 2 answers | 0

### 2

answersQuestion

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...

mer än 5 år ago | 2 answers | 0