Haw a look at Create a correlation heatmap for some hints assuming I understood the question.
Otherwise can you supply more info?
A handy way to supply some sample data is the dput() function. In the case of a large dataset something like dput(head(mydata, 100)) should supply the data we need. Just do dput(mydata) where mydata is your data. Copy the output and paste it here between
```
```