---
title: "Homework 4"
date: "November 21, 2019"
author: "Write your name here"
number: STUDENT_NUMBER
subtitle: "Computing in Molecular Biology and Genetics I. Istanbul University."
output: 
  html_document: 
    number_sections: yes
    self_contained: no
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```


1. Download the file [`midterm.txt`](/static/2019/cmb1/midterm.txt), store it in your computer, and read it into a data frame called `midterm`. Show `summary(midterm)`.
```{r q1}
# write here
```

2. Plot the vector `midterm$Grade`.
```{r q2}
# write here
```

3. Change the plot character to a solid bullet.
```{r q3}
# write here
```

4. Change the color of all points to blue.
```{r q4}
# write here
```

5. Change the color of each point, depending on `midterm$Num_Homework`. The result should be like the following image.
```{r q5}
# write here
```

6. Now each point is red color, and the size depends on the number of homework delivered. The result should be like the following image.
```{r q6}
# write here
```

7. Change the symbol of each point, depending on the number of homework delivered.
```{r q7}
# write here
```

8. Now each point should have a solid symbol. These symbols are identified by number 15, 16, 17, and 18.
```{r q8}
# write here
```

9. Combine everything. Change the plot character, the color, and the symbol size, depending on the number of homework delivered.
```{r q9}
# write here
```

10. Change the plot symbol by a letter. The vector `LETTERS` can be useful.
```{r q10}
# write here
```

11. This time use lines. Draw the following figure. The black line shows the grades, the red line is `midterm$Num_Homework*33`.
```{r q11}
# write here
```