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R Introductory Series: Lists

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Bioinformatics

Unlike an atomic vector, a list can contain multiple elements of different types, (e.g., character vector, numeric vector, list, data frame, matrix).

Introductory R for Novices: Lists

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Bioinformatics

Unlike an atomic vector, a list can contain multiple elements of different types, (e.g., character vector, numeric vector, list, data frame, matrix). Lists are not the focus of this lesson, but you should be Read More...

R Introductory Series: Vectors

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Bioinformatics

Vectors are probably the most used commonly used object type in R. A vector is a collection of values that are all of the same type (numbers, characters, etc.). The columns that make up a Read More...

R Introductory Series: Using %in%

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Bioinformatics

%in% "returns a logical vector indicating if there is a match or not for its left operand". This logical vector can then be used to filter the datamframe to only matched values. For Read More...

R Introductory Series 2023: Vectors

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Bioinformatics

Vectors are probably the most used commonly used object type in R. A vector is a collection of values that are all of the same type (numbers, characters, etc.). The columns that make up a Read More...

Biopharmaceutical Development Program (BDP)
Frederick, MD

Collaborative

The Biopharmaceutical Development Program (BDP) provides resources for the development of investigational biological agents. The BDP supports feasibility through development and Phase I/II cGMP manufacturing plus regulatory documentation.The BDP was established in 1993. We Read More...

R Introductory Series: Logical subsetting

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Bioinformatics

It is also possible to subset in R using logical evaluation or numerical comparison. To do this, we use comparison operators (See table below). Comparison Operator Description > greater than >= greater than or equal Read More...

R Introductory Series: Test your learning

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Bioinformatics

Given the following R code: fruit 678] c. Total_subjects(Total_subjects < 678) d. Total_subjects[Total_subjects < 678] {{Sdet}} Solution{{Esum}} D {{Edet}}

Data Wrangling with R: The %in% operator

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Bioinformatics

Used to match elements of a vector. %in% returns a logical vector indicating if there is a match or not for its left operand. --- match R Documentation. The returned logical vector will be the Read More...

R Introductory Series 2023: Logical subsetting

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Bioinformatics

It is also possible to subset in R using logical evaluation or numerical comparison. To do this, we use comparison operators (See table below). Comparison Operator Description > greater than >= greater than or equal Read More...

March 2023 Newsletter

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CREx Monthly Newsletter Learn about the NIH Collaborative Research Exchange (CREx), Core Facilities, Webinars, & More New Resources on CREx NCI CLIA Molecular Diagnostics Laboratory (CMDL) The NCI CMDL is available to assist all Read More...

R Introductory Series: Using functions

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Bioinformatics

A function in R (or any computing language) is a short program that takes some input and returns some output. An R function has three key properties: Functions have a name (e.g. dir, getwd); Read More...

R Introductory Series: Data Structures

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Bioinformatics

Data structures are objects that store data. Previously, we learned that vectors are collections of values of the same type . A vector is also one of the most basic data structures. Other common data structures Read More...

R Introductory Series: What are factors?

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Bioinformatics

Factors are an important data structure in statistical computing. They are specialized vectors (ordered or unordered) for the storage of categorical data. While they appear to be character vectors, data in factors are stored as Read More...

R Introductory Series: Objectives

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Bioinformatics

To understand some of the most basic features of the R language including: Creating R objects and understanding object types Using mathematical operations Using comparison operators Creating, subsetting, and modifying vectors By the end of Read More...

R Introductory Series: Important functions

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Bioinformatics

factor() - to create a factor and reorder levels as.factor() - to coerce to a factor levels() - view the levels of a factor nlevels() - return the number of levels For example: sex

Data Wrangling with R: Practice problems

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Bioinformatics

Which of the following will throw an error and why? 4 _ chr :1:2: unexpected input ## 1: 4_ ## ^ . 4 chr :1:3: unexpected symbol ## 1: .4chr ## ^ {{Edet}} Create the following objects; give each object an appropriate name (your best guess at what name to Read More...

Data Wrangling with R: Lesson 2: Help Session

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Bioinformatics

This is our first coding help session. We have designed some practice problems to get you acquainted with using R before beginning to wrangle in our next lesson. Practice problems Which of the following will Read More...

Data Wrangling with R: Subsetting Data (library(dplyr))

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Bioinformatics

select() - Filters data by column. Check out associated helper functions: Select specific columns: everything() last_col() Select columns by matching some aspect of the column name: starts_with() ends_with() contains() matches() num_range() Read More...

R Introductory Series 2023: R basics

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Bioinformatics

Objectives : To understand some of the most basic features of the R language including: Creating R objects and understanding object types Using mathematical operations Using comparison operators Creating, subsetting, and modifying vectors By the end Read More...

Mass Spectrometry for Proteins

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Mass Spectrometry Section of the Collaborative Protein Technology Resource (Bldg. 37) Core Capabilities: Identification of proteins in complexes, organelles, subcellular fractions, or fluids. Global relative protein quantitation. Quantitation by isotopic labeling of cells in culture (SILAC) Read More...

Protein Expression Laboratory

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Protein Expression Laboratory The Protein Expression Laboratory develops, improves, and delivers protein-centric services. Our goal is to help client investigators achieve their research goals with the lowest possible cost in the shortest time. All PEL Read More...

Spatiotemporal Modeling of Molecular Holograms

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Bioinformatics

03/20/2025 - Please note: Registration is required to get the Meeting Link for this event. Please pre-register. BTEP and the Single Cell and Spatial Transcriptomics Interest Group jointly present: Quantifying spatiotemporal dynamics during embryogenesis is crucial Read More...

R Introductory Series: Basics of R Programming

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Bioinformatics

Objectives To understand some of the most basic features of the R language including: Creating R objects and understanding object types Using mathematical operations Using comparison operators Creating, subsetting, and modifying vectors By the end Read More...

R Introductory Series: Data Matrices

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Bioinformatics

Another important data structure in R is the data matrix. Data frames and data matrices are similar in that both are tabular in nature and are defined by dimensions (i.e., rows (m) and columns ( Read More...

R Introductory Series: Object data types

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Bioinformatics

The data type of an R object affects how that object can be used or will behave. Examples of base R data types include numeric, integer, complex, character, and logical. R objects can also have Read More...

R Introductory Series 2023: R Basics

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Bioinformatics

R basics Objectives : To understand some of the most basic features of the R language including: Creating R objects and understanding object types Using mathematical operations Using comparison operators Creating, subsetting, and modifying vectors By Read More...

R Introductory Series 2023: Object data types

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Bioinformatics

R objects have certain attributes, and these attributes will be important for how they can interact with certain methods / functions. Understanding the mode (storage type) or the class of an object will be important for Read More...

R Introductory Series 2023: Mutate and transmute

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Bioinformatics

Other useful data manipulation functions from dplyr include mutate() and transmute() . These functions allow you to create a new variable from existing variables. Perhaps you want to know the ratio of two columns or convert Read More...

R Introductory Series: Introduction to R and RStudio

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Bioinformatics

Learning Objectives To understand: 1. the difference between R and RStudioIDE. 2. how to work within the RStudio environment including: creating an Rproject and Rscript navigating between directories using functions obtaining help how R can enhance data Read More...

Data Wrangling with R: Excel files (.xls, .xlsx)

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Bioinformatics

Excel files are the primary means by which many people save spreadsheet data. .xls or .xlsx files store workbooks composed of one or more spreadsheets. Importing excel files requires the R package readxl . While this Read More...

R Introductory Series 2023: Introduction to R and RStudio

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Bioinformatics

Introduction to R and RStudio IDE Objectives To understand: 1. the difference between R and RStudioIDE. 2. how to work within the RStudio environment including: creating an Rproject and Rscript navigating between directories using functions obtaining help 3. Read More...

The Art and Science of Data Mining (1-day)

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Bioinformatics

06/19/2017 - Harvesting the Wealth of TCGA Data The Cancer Genome Atlas (TCGA) is a large-scale study that has catalogued genomic data accumulated from more than 20 different types of cancer including mutations, copy number variation, mRNA Read More...