Finding Row Number for Items in 2D array

[fafzal]

No loops needed. Numpy can do all the work by itself:

three = three * np.arange(three.shape[0])[:, np.newaxis] # 0-based numbering # or three = three * np.arange(1, three.shape[0] + 1)[:, np.newaxis] # 1-based numbering 

This works neatly but I'm sorry I should have mentioned that I'm asked to do this using indexing and looping.

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I was able to find a way and wanted to post back. Here's what worked
Thanks for the help

for i in range (0,5):
    three[i]=three[i]*(i+1)