Multiply the columns of the data frame by the elements of the vector in R

Multiply matrix columns by vector.Rmd

---
title: "Multiply the columns of the data frame by the elements of the vector"
output: html_notebook
---

Matrix: 
```{r}
(mat <- matrix(c(4:9),ncol = 2))
```

Vector:
```{r}
(vec <- c(3,4))
```


One quick way to multiply the columns of the data frame by the elements of the vector is to construct a diagonal matrix and then multiply the two together: 
```{r}
(vec <- diag(vec))
```

And multiply: 
```{r}
mat %*% vec
```