I am working with RNA seq data with Gene names as my first column and cluster gene expression data as the following columns. There are a lot of genes however I am only interested in about 200 of them. Is there a way to just target those specific genes and then create a data matrix with them. I can retrieve information from columns 

```
Mydata.1 <- x[c("Gene Name", "Cluster_1")]

```

But not rows for example this fails

```
Mydata.1 <- x[c("Malat1", "Cd74")] 

```

does anyone know how I would be able to do that? 
Thanks!