### Check Java version with java –version

Source: https://jdemetradocumentation.github.io/JDemetra-documentation/pages/quick-start/installing-jdemetra.html

Run this command in a terminal to verify that Java SE Runtime Environment (JRE) is properly installed. If launching JDemetra+ fails, this is the first troubleshooting step.

```bash
java –version
```

--------------------------------

### Load simulated data from Excel file

Source: https://jdemetradocumentation.github.io/JDemetra-documentation/2019/02/19/rotating-errors.html

Loads an Excel file with simulated data and converts it into a matrix named 'errors' with time in rows and errors for 5 waves in columns.

```R
# Let's load an excel file with simulated data 
data<-read_excel("../Data/simulWaves.xlsx")
# Convert it into a matrix named "errors"
#(time in the rows and errors corresponding to 5 waves in the columns)
errors<-as.matrix(data[,1:5])

```