I've got a vector with some values, and I want to replace the vector indexing by names. So, I want to replace `[1,] [2,] [3,]`

by some names like this:

Here are the beta values without names:

```
[1,] 9.335256626
[2,] 0.031369303
[3,] -0.050801928
[4,] -0.513624383
[5,] -3.714115555
[6,] 0.022378632
[7,] .
[8,] -0.599622031
[9,] 0.494720259
[10,] .
[11,] -0.106661630
[12,] -0.007580542
[13,] 0.117596852
[14,] -0.125227171
```

And I am trying to add names like this:

```
(Intercept) 9.335256626
zn 0.031369303
indus -0.050801928
chas -0.513624383
nox -3.714115555
rm 0.022378632
age .
dis -0.599622031
rad 0.494720259
tax .
ptratio -0.106661630
black -0.007580542
lstat 0.117596852
medv -0.125227171
```

This is what I did till now:

```
library(MASS)
library(glmnet)
Boston=na.omit(Boston)
x=model.matrix(crim~.,Boston)[,-1]
y=as.matrix(Boston$crim)
lasso.mod =glmnet(x,y, alpha =1, lambda = 0.1)
beta=coef(lasso.mod)
rownames(beta)=c() #Here I removed the names just to try to add them
```

I tried this `rownames(beta[,-1])=colnames(x)`

but I get an error: **Error in dimnamesGets(x, value) :
invalid dimnames given for “dgCMatrix” object**