Zara  Bryant

Zara Bryant

1549947888

Rename files with loop variable name

I am trying to download a bunch of files and rename them as I go. the download portion works correctly, but i can't get it to rename the files. This is the script I'm using:

COUNTER=0
for (( i = 696; i <= 773; i++ ))
  do
  fastq-dump --split-3 --accession SRR546$i
mv SRR546"$i"_1 ./"$COUNTER"mVD_SRR546$i_1
mv SRR546"$i"_2 ./"$COUNTER"mVD_SRR546$i_2
gzip *.fastq

COUNTER=$[COUNTER + 1]
done

This will correctly download the file SRR546696, SRR546697 etc. but does nothing to rename them.

I also tried using:

rename ‘s/SRR/"$COUNTER"mVD_SRR/’ *.fastq

but this also did nothing.

#bash #loops

What is GEEK

Buddha Community

Brooke Giles

1549962682

You need to double quote the arguments to prevent word splitting and globbing. At the same time, you need to preserve the variable names with {}:

counter=0
for ((i = 696; i <= 773; i++)); do
  fastq-dump --split-3 --accession "SRR546$i"
  mv "SRR546${i}_1" "./${counter}mVD_SRR546${i}_1"
  mv "SRR546${i}_2" "./${counter}mVD_SRR546${i}_2"
  gzip *.fastq
  ((counter++))
done

Improvements:

  • use lower case for your normal variables (counter instead of COUNTER)
  • use quoting to prevent word splitting and globbing (though not an issue in your problem since the variable holds a number, free from space or other meta characters
  • use a single set of double quotes rather than multiple single quotes
  • use ++ operator to increment counter as in ((counter++) and ((…)) is a better syntax than $[ … ]
Ida  Nader

Ida Nader

1599099600

How to Use If-Else Statements and Loops in R – Dataquest

When we’re programming in R (or any other language, for that matter), we often want to control when and how particular parts of our code are executed. We can do that using control structures like if-else statements, for loops, and while loops.

Control structures are blocks of code that determine how other sections of code are executed based on specified parameters. You can think of these as a bit like the instructions a parent might give a child before leaving the house:

“If I’m not home by 8pm, make yourself dinner.”

Control structures set a condition and tell R what to do when that condition is met or not met. And unlike some kids, R will always do what we tell it to! You can learn more about control structures in the R documentation if you would like.

In this tutorial, we assume you’re familiar with basic data structures, and arithmetic operations in R.

Not quite there yet? Check out our Introductory R Programming course that’s part of our Data Analyst in R path. It’s free to start learning, there are no prerequisites, and there’s nothing to install — you can start learning in your browser right now.

install.packages(“Dataquest”)

Start learning R today with our Introduction to R course — no credit card required!

SIGN UP

(This tutorial is based on our intermediate R programming course, so check that out as well! It’s interactive and will allow you to write and run code right in your browser.)

Comparison Operators in R

In order to use control structures, we need to create statements that will turn out to be either TRUE or FALSE. In the kids example above, the statement “It’s 8pm. Are my parents home yet?” yields TRUE (“Yes”) or FALSE (“No”). In R, the most fundamental way to evaluate something as TRUE or FALSE is through comparison operators.

Below are six essential comparison operators for working with control structures in R:

  • == means equality. The statement x == a framed as a question means “Does the value of x equal the value of a?”
  • != means “not equal”. The statement x == b means “Does the value of x not equal the value of b?”
  • < means “less than”. The statement x < c means “Is the value of x less than the value of c?”
  • <= means “less than or equal”. The statement x <= d means “Is the value of x less or equal to the value of d?”
  • > means “greater than”. The statement x > e means “Is the value of x greater than the value of e?”
  • >= means “greater than or equal”. The statement x >= f means “Is the value of xgreater than or equal to the value of f?”

#data science tutorials #beginner #for loop #for loops #if #if else #learn r #r #r tutorial #rstats #tutorial #tutorials #while loop #while loops

August  Larson

August Larson

1624331040

Python For Loop (with Examples)

A Python tutorial to understand the uses of for loop in various ways including examples.

Python is a general-purpose programming language, which emphasizes making programming easy, efficient coding, and unleashes the user’s potential. Loops are the vital part of programming as it allows the user to repetitive use a set of codes using loops. So in the following article, we will see how to use for loops in python.

FOR Loop:

Till the iteration of the last item in the sequence, for loop run the instructions. It iterates over sets of instructions in sequence, arrays, and a tuple for a pre-defined period or until the last item and calculation are executed.

For loop can be categorized in three ways.

  1. Traditional for loop – It is usually used in programming language and contains three parts of a loop, i.e., initialization, condition, increment/decrement.
  2. Iterator/collection-based for loop – It is used for the iteration of objects and collections instead of numbers.
  3. Vectorize for loop – It is used to iterate parallel arrays simultaneously.

#python #for loop #loops #loop #python for loop

I am Developer

1597559012

Multiple File Upload in Laravel 7, 6

in this post, i will show you easy steps for multiple file upload in laravel 7, 6.

As well as how to validate file type, size before uploading to database in laravel.

Laravel 7/6 Multiple File Upload

You can easily upload multiple file with validation in laravel application using the following steps:

  1. Download Laravel Fresh New Setup
  2. Setup Database Credentials
  3. Generate Migration & Model For File
  4. Make Route For File uploading
  5. Create File Controller & Methods
  6. Create Multiple File Blade View
  7. Run Development Server

https://www.tutsmake.com/laravel-6-multiple-file-upload-with-validation-example/

#laravel multiple file upload validation #multiple file upload in laravel 7 #multiple file upload in laravel 6 #upload multiple files laravel 7 #upload multiple files in laravel 6 #upload multiple files php laravel

Zara  Bryant

Zara Bryant

1549947888

Rename files with loop variable name

I am trying to download a bunch of files and rename them as I go. the download portion works correctly, but i can't get it to rename the files. This is the script I'm using:

COUNTER=0
for (( i = 696; i <= 773; i++ ))
  do
  fastq-dump --split-3 --accession SRR546$i
mv SRR546"$i"_1 ./"$COUNTER"mVD_SRR546$i_1
mv SRR546"$i"_2 ./"$COUNTER"mVD_SRR546$i_2
gzip *.fastq

COUNTER=$[COUNTER + 1]
done

This will correctly download the file SRR546696, SRR546697 etc. but does nothing to rename them.

I also tried using:

rename ‘s/SRR/"$COUNTER"mVD_SRR/’ *.fastq

but this also did nothing.

#bash #loops

Hudson  Larkin

Hudson Larkin

1599201978

For loop in C++ Program | C++ For Loop Example

For loop in C++ Program | C++ For Loop Example is today’s topic. For understanding for loop, we must have prior knowledge of loops in C++. Loops are used when we want a particular piece of code to run multiple times. We use loops to execute the statement of codes repeatedly until a specific condition is satisfied. It eases the work of the programmer and also shortens the code length.

For loop in C++ Program

For example, if we want to print numbers from 1 to 1000, then if we don’t use loops, we have to write 1000 different print statements for printing numbers from 1 to 1000. With the help of loops, we can write this code in 2 lines. We need to run the loop and give iteration conditions.

There are 3 types of loops for loopwhile loop and do-while loop. In this tutorial, we will learn about for loop.

A for loop is the repetition control structure that is generally used to write a code more efficiently which is supposed to be executed a specific number of times.

#c++ #for loop #while loop #do-while loop