Thiago G. Martins thigm85
thigm85
/ YahooFinance_odb_table.R
Last active
December 17, 2015 12:09
This is the first step to establish a simple and free database to hold stock quotes downloaded from Yahoo Finance!
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| require(ODB) | |
| database_path = "~/example_path/my_database.odb" | |
| # Create a database | |
| odb.create(database_path) | |
| # Connect to the database | |
| ODB <- odb.open(database_path) |
thigm85
/ simple_neural_network_diagram
Created
May 26, 2013 15:10
Graphviz script to draw a simple neural network diagram. Copy this to a `file.txt` file and then run `dot -Tpng -O file.txt` from command-line to get a .png figure with the diagram.
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| digraph G { | |
| rankdir=LR | |
| splines=line | |
| node [fixedsize=true, label=""]; | |
| subgraph cluster_0 { | |
| color=white; | |
| node [style=solid,color=blue4, shape=circle]; |
thigm85
/ multi_class_neural_netwrok_diagram
Created
June 11, 2013 20:04
Graphviz script to draw a multi-class neural network diagram. Copy this to a `file.txt` file and then run `dot -Tpng -O file.txt` from command-line to get a .png figure with the diagram.
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| digraph G { | |
| rankdir=LR | |
| splines=line | |
| nodesep=.05; | |
| node [label=""]; | |
| subgraph cluster_0 { | |
| color=white; |
thigm85
/ transform_center_scale_caret.R
Last active
December 27, 2015 15:59
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| require(ggplot2) | |
| require(gridExtra) | |
| require(reshape2) | |
| set.seed(1) | |
| predictors = data.frame(x1 = rnorm(1000, mean = 5, sd = 2), | |
| x2 = rexp(1000, rate=10)) | |
| p1 = ggplot(predictors) + geom_point(aes(x = x1, y = x2)) |
thigm85
/ loading_plot.R
Created
November 28, 2013 09:45
Sample code to plot PCs coefficients associated with variables in the dataset. See http://tgmstat.wordpress.com/2013/11/28/computing-and-visualizing-pca-in-r/ for more info.
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| require(ggplot2) | |
| theta <- seq(0,2*pi,length.out = 100) | |
| circle <- data.frame(x = cos(theta), y = sin(theta)) | |
| p <- ggplot(circle,aes(x,y)) + geom_path() | |
| loadings <- data.frame(ir.pca$rotation, | |
| .names = row.names(ir.pca$rotation)) | |
| p + geom_text(data=loadings, | |
| mapping=aes(x = PC1, y = PC2, label = .names, colour = .names)) + |
thigm85
/ lda_vs_pca.R
Last active
March 16, 2021 11:31
Visualize the difference between PCA and LDA on the iris dataset.
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| require(MASS) | |
| require(ggplot2) | |
| require(scales) | |
| require(gridExtra) | |
| pca <- prcomp(iris[,-5], | |
| center = TRUE, | |
| scale. = TRUE) | |
| prop.pca = pca$sdev^2/sum(pca$sdev^2) |
thigm85
/ Class_GermanCredit.R
Created
February 12, 2014 08:35
Code for Figure 1 in http://tgmstat.wordpress.com/2014/02/12/german-credit-data/
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| require(ggplot2) | |
| # Figure 1 | |
| ggplot(GermanCredit, aes(x = Class)) + | |
| geom_bar(aes(y = (..count..)/sum(..count..))) + | |
| labs(y = "prob.") |
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| var http = require("http"); | |
| http.createServer(function (request, response) { | |
| // Send the HTTP header | |
| // HTTP Status: 200 : OK | |
| // Content Type: text/plain | |
| response.writeHead(200, {'Content-Type': 'text/plain'}); | |
| // Send the response body as "Hello World" |
thigm85
/ file_uploader.html
Created
February 9, 2016 13:46
File uploader using POST method. Reference: http://www.tutorialspoint.com/nodejs/nodejs_express_framework.htm
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| <html> | |
| <head> | |
| <title>File Uploading Form</title> | |
| </head> | |
| <body> | |
| <h3>File Upload:</h3> | |
| Select a file to upload: <br /> | |
| <form action="http://127.0.0.1:8081/file_upload" method="POST" | |
| enctype="multipart/form-data"> | |
| <input type="file" name="file" size="50" /> |
thigm85
/ pre_post_clean_pom.xml
Created
February 17, 2016 21:25
POM file where a goal is executed in the pre-clean, clean and post-clean phases of the clean lifecycle. Reference: http://www.tutorialspoint.com/maven/maven_build_life_cycle.htm
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| <project xmlns="http://maven.apache.org/POM/4.0.0" | |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 | |
| http://maven.apache.org/xsd/maven-4.0.0.xsd"> | |
| <modelVersion>4.0.0</modelVersion> | |
| <groupId>com.companyname.projectgroup</groupId> | |
| <artifactId>project</artifactId> | |
| <version>1.0</version> | |
| <build> | |
| <plugins> |
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