# Save `BumpyMatrix` objects to file
|Environment|Status|
|---|---|
|[BioC-release](https://bioconductor.org/packages/release/bioc/html/alabaster.bumpy.html)|[](http://bioconductor.org/checkResults/release/bioc-LATEST/alabaster.bumpy/)|
|[BioC-devel](https://bioconductor.org/packages/devel/bioc/html/alabaster.bumpy.html)|[](http://bioconductor.org/checkResults/devel/bioc-LATEST/alabaster.bumpy/)|
The **alabaster.bumpy** package implements methods for saving and loading [`BumpyMatrix`](https://bioconductor.org/packages/BumpyMatrix) objects under the **alabaster** framework.
It provides a language-agnostic method for serializing data in bumpy matrices, most typically as assays of a `SummarizedExperiment`.
To get started, install the package and its dependencies from [Bioconductor](https://bioconductor.org/packages/alabaster.bumpy):
```r
# install.packages("BiocManager")
BiocManager::install("alabaster.bumpy")
```
Let's create a `BumpyMatrix` object:
```r
library(BumpyMatrix)
library(S4Vectors)
df <- DataFrame(x=runif(100), y=runif(100))
f <- factor(sample(letters[1:20], nrow(df), replace=TRUE), letters[1:20])
mat <- BumpyMatrix(split(df, f), c(5, 4))
```
We save it to file:
```{r}
library(alabaster.bumpy)
tmp <- tempfile()
saveObject(mat, tmp)
```
And then load it back:
```{r}
roundtrip <- readObject(tmp)
class(roundtrip)
## [1] "BumpyDataFrameMatrix"
## attr(,"package")
## [1] "BumpyMatrix"
```
