You want to save multiple numpy arrays a and b into a single .mat file and later load them back. Which code correctly saves and loads these arrays so you can access them by their variable names?
hard📝 Application Q15 of 15
SciPy - Integration with Scientific Ecosystem
You want to save multiple numpy arrays a and b into a single .mat file and later load them back. Which code correctly saves and loads these arrays so you can access them by their variable names?
Aio.savemat('multi.mat', [a, b])
data = io.loadmat('multi.mat')
print(data['a'], data['b'])
Bio.savemat('multi.mat', a, b)
data = io.loadmat('multi.mat')
print(data['a'], data['b'])
Cio.savemat('multi.mat', {'a': a, 'b': b})
data = io.loadmat('multi.mat')
print(data['multi']['a'], data['multi']['b'])
Dio.savemat('multi.mat', {'a': a, 'b': b})
data = io.loadmat('multi.mat')
print(data['a'], data['b'])
Step-by-Step Solution
Solution:
Step 1: Save multiple arrays with a dictionary
Use a dictionary with keys as variable names and values as arrays in savemat. io.savemat('multi.mat', {'a': a, 'b': b})
data = io.loadmat('multi.mat')
print(data['a'], data['b']) does this correctly.
Step 2: Load and access arrays by keys
After loading, access arrays by their keys 'a' and 'b' in the loaded dictionary. io.savemat('multi.mat', {'a': a, 'b': b})
data = io.loadmat('multi.mat')
print(data['a'], data['b']) prints them correctly.
Final Answer:
io.savemat('multi.mat', {'a': a, 'b': b})
data = io.loadmat('multi.mat')
print(data['a'], data['b']) -> Option D
Quick Check:
Save/load dict with keys = variable access [OK]
Quick Trick:Save dict with names, load dict and access keys [OK]
Common Mistakes:
Passing list instead of dict to savemat
Trying to access nested keys incorrectly
Passing multiple args to savemat instead of one dict
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