Use of .4f in C1_W2_Lab01_Python_Numpy_Vectorization_Soln

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
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np.random.seed(1)
a = np.random.rand(10000000) # very large arrays
b = np.random.rand(10000000)

tic = time.time() # capture start time
c = np.dot(a, b)
toc = time.time() # capture end time

print(f"np.dot(a, b) = {c:.4f}")
print(f"Vectorized version duration: {1000*(toc-tic):.4f} ms ")

I didn’t understand the use of {c:.4f}
what is .4f?

1 Like
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Hey @Ayush_Kazi_Shrestha,
Welcome to the community.

It is used to control the number of decimals to be printed by the print statement in Python for floating-point values. For instance, consider the following Python code:

variable = 10 /3
print(variable)
print(f"{variable:.4f}")

It will result in the following output,

3.3333333333333335
3.3333

Let me know if it helps.

Cheers,
Elemento

1 Like
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Hey @rmwkwok,
If I am not wrong, you wrote an elaborated reply regarding this exact issue recently. Can you please provide the link to that thread? I am unable to find that thread.

Cheers,
Elemento

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@Elemento, here it is.

Raymond

1 Like
5

Hey @rmwkwok, thanks a lot for sharing this. @Ayush_Kazi_Shrestha, please do check this thread out for further information.

Cheers,
Elemento

1 Like
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Thank you, I get it now. @Elemento