In R, the .rdata file is created with the save() function.
- Use the save() function to save one or more R objects into a .rdata file.
- Use the load() function to restore objects in the .rdata file to the current work environment.
1. Create and save the object to .rdata
Suppose there is a linear regression model trained on the iris dataset and want to save it to a .rdata file:
# Load the necessary packageslibrary(tidymodels)
# Train a simple model using the iris dataset(123) # Set random seeds to ensure results are repeatablemodel <- linear_reg() %>%
set_engine("lm") %>%
fit( ~ , data = iris)
# View model summarysummary(model)
# Save the model as a .rdata filesave(model, file = "models/tidymodels_iris.rdata")- A linear regression model was trained using the linear_reg() function in the tidymodels package.
- Use the save() function to save the model object (model) to the models/tidymodels_iris.rdata file.
2. Save multiple objects to the same .rdata file
# Create some extra objectspredictions <- model %>% predict(new_data = iris) metrics <- metrics(truth = iris$, estimate = predictions$.pred) # Save the model, predicted values and evaluation metrics togethersave(model, predictions, metrics, file = "models/tidymodels_iris.rdata")
The models/tidymodels_iris.rdata file will contain three objects: model, predictions, and metrics.
3. Load and check saved content
# Load the .rdata fileload("models/tidymodels_iris.rdata")
# View objects in the work environmentls()
# Check the specific content of an objectsummary(model)
head(predictions)
print(metrics)4. Things to note
- Path issue: Make sure the paths are correct when saving and loading the file. If the path is incorrect, R may not be able to find the file.
- Object Naming: The object name saved to the .rdata file will be preserved. Therefore, after loading the file, these objects can be accessed directly by the name.
- Version Compatibility: The .rdata file is in binary format and may depend on the version and operating system of R. Try to save and load files in the same environment.
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