Why same output address is invalid in a transaction on Bitcoin Core?

I’m studying Bitcoin Core currently. I found incomprehensible code, that shows making a transaction is rejected if there are same output addresses in a transaction. See Fig1, Fig2 Origin source code : https://github.com/bitcoin/bitcoin/blob/8aac85d71e218783bc7ce06e5bf8bc660e24079d/src/rpc/rawtransaction_util.cpp#L95 So, the transaction illustrated in Fig1 will be rejected as shown Fig3. Can you give reason about the policy of described in…

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Create New File keyboard shortcut Ubuntu 18.04

I was wondering whether there is a possibility to assign a keyboard shortcut for creating a new empty file in Ubuntu 18.04 for nautilus. Namely if there is a possibility to assign a keyboard shortcut to the “Empty File” option generated by the right mouse click. The solution provided in [1]: http:////askubuntu.com/questions/53202/how-do-you-create-a-new-document-keyboard-shortcut does not appear…

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Librosa Display Waveplot, why are they totally blue and flat?

I followed this example of Music Synchronization with Dynamic Time Warping However, when I do this: import matplolib.pyplot as plt import librosa import librosa.display x_1, fs = librosa.load(‘musicdata/slow_melody.wav’) plt.figure(figsize=(16, 4)) librosa.display.waveplot(x_1, sr=fs) plt.title(‘Slower Version $X_1$’) plt.tight_layout() and same for the faster version, I get this result: I can properly reach the pitch classes of the…

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