# TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array

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I want to write a function that randomly picks elements from a training set, based on the bin probabilities provided. I divide the set indices to 11 bins, then create custom probabilities for them.

``````bin_probs = [0.5, 0.3, 0.15, 0.04, 0.0025, 0.0025, 0.001, 0.001, 0.001, 0.001, 0.001]

X_train = list(range(2000000))

train_probs = bin_probs * int(len(X_train) / len(bin_probs)) # extend probabilities across bin elements
train_probs.extend([0.001]*(len(X_train) - len(train_probs))) # a small fix to match number of elements
train_probs = train_probs/np.sum(train_probs) # normalize
indices = np.random.choice(range(len(X_train)), replace=False, size=50000, p=train_probs)
out_images = X_train[indices.astype(int)] # this is where I get the error
``````

I get the following error:

``````TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array
``````

I find this weird, since I already checked the array of indices that I have created. It is 1-D, it is integer, and it is scalar.

What am I missing?

Note : I tried to pass `indices` with `astype(int)`. Same error.

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We hope this article has helped you to resolve the problem. Apart from TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array, check other array Python module-related topics.

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Boris Krasiko

Prague | 2023-01-31

Simply put and clear. Thank you for sharing. TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array and other issues with astype was always my weak point 😁. Will use it in my bachelor thesis

Oliver Chamberlet

Massachussetts | 2023-01-31

Simply put and clear. Thank you for sharing. TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array and other issues with Arrays was always my weak point 😁. I just hope that will not emerge anymore

Frank Robinson

Singapore | 2023-01-31

I was preparing for my coding interview, thanks for clarifying this - TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array in Python is not the simplest one. Will get back tomorrow with feedback

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