<p>This should work:</p>

<pre><code>mut<span class="math-container">$chr &lt;- paste("chr", mut$</span>chr, sep = "")
</code></pre>

CC BY-SA 4.0
2019-03-31T22:13:26.517Z
if you use *paste0* instead of *paste*, you can omit the 'sep=""'
gringer
CC BY-SA 4.0
2019-03-31T17:57:27.563Z
2019-03-31T18:02:45.357Z
2019-03-31T18:02:45.357Z
h3ab74
<p>I have this dataframe </p>

<pre><code>&gt; head(mut)
  sample chr     pos ref alt
1  t_005   1  928006   G   A
2  t_005   1 1649842   G   T
3  t_005   1 2020408   G   A
4  t_005   1 2031677   T   A
5  t_005   1 2901878   G   A
6  t_005   1 3039338   G   A
&gt;
</code></pre>

<p>How I can add <code>"chr"</code> to the <code>chr</code> column? I mean, instead of <code>"1"</code> I want <code>"chr1"</code>, etc.</p>

CC BY-SA 4.0
2019-04-01T09:21:33.187Z
This is basic R question and more suitable to StackOverflow main site, and it is already has been asked many times, see [here for example](https://stackoverflow.com/q/24055308/680068)
zx8754
<r>
Adding a string to start of one column
# Adding a string to start of one column

(Asked by: username_0 on 2019-03-31)

I have this dataframe 
> head(mut)
  sample chr     pos ref alt
1  t_005   1  928006   G   A
2  t_005   1 1649842   G   T
3  t_005   1 2020408   G   A
4  t_005   1 2031677   T   A
5  t_005   1 2901878   G   A
6  t_005   1 3039338   G   A
>

How I can add "chr" to the chr column? I mean, instead of "1" I want "chr1", etc.

**Tags:** r
> **Comments:**
> **username_1**: This is basic R question and more suitable to StackOverflow main site, and it is already has been asked many times, see [here for example](https://stackoverflow.com/q/24055308/680068)  

---

## 1 answers

### Answer by username_2 on 2019-03-31. Score: 5 | Accepted answer

This should work:
mut$chr <- paste("chr", mut$chr, sep = "")

> **Comments:**
> **username_3**: if you use *paste0* instead of *paste*, you can omit the 'sep=""'  

---

