Notebook for chapter 1.Rmd

---
title: "R Notebook"
output: html_notebook
---

This is an [R Markdown](http://rmarkdown.rstudio.com) Notebook. When you execute code within the notebook, the results appear beneath the code. 

Try executing this chunk by clicking the *Run* button within the chunk or by placing your cursor inside it and pressing *Ctrl+Shift+Enter*. 

```{r}
plot(cars)
```
Basic commands on R
Assigning variable 
```{r}
x<- 2*8
x
```
Numeric Vector and operation on it
```{r}
y <- c(2.3, 1, 5)
y
```

```{r}
length(y)
mode(y)
class(y)
```
sequence of integers storing in vector
```{r}
mynums <- 10:1
mynums 
```
operating on Numeric vector
```{r}
sum(mynums)
min(mynums)
max(mynums)
range(mynums)
```
standard deviation, mean and median 
```{r}
mean(mynums)
sd(mynums)
median(mynums)
```
Indexing Numeric vector
```{r}
mynums[2]
mynums[1:4]	
mynums[-4] # retrieve everything except fourth position
```
character vectors
```{r}
gender <- c('F', 'M', 'M', 'F', 'F')
gender
class(gender)
```
Finding repitition of a character
```{r}
gender[gender == 'F']
```
operating on Data frames
```{r}
participant <- c('louis', 'paula', 'vincenzo')
mydf <- data.frame(participant, score = c(67, 85, 32)) 
mydf
mydf$score
mean(mydf$score)
```
Indexing on Data frame
```{r}
mydf[1,] # first row
mydf[, 1][2]
```
Indexing
```{r}
mydf[2, ] # 2nd column
```
PLOTING
```{r}
mean(mydf$score)
str(mydf)
summary(mydf)
```
Loading files
```{r}
covid_19 <- read.csv('india_covid_19_statewise_status.csv')
covid_19
```
ASSIGNMENT
Assignment for chapter -1 

1.	Create a Numeric vector with 10 elements ranging between 20 to 30, name it Mynums. Find maximum and minimum element of the vector. Compute Sum operation on the vector put it in a variable z. Find out the 4,5,6 th element of the vector.

2.	Create a 10 element numeric vector and compute mean, median and Standard deviation of the vector. 

3.	Create a dataframe with 5 participants and their math score. Calculate mean of their score.


Student name	Math score
Louis	67
Paul	86
Vincenzo	80
Tim	56
Dorothy	91