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I have a numpy array and I want to force every element that is less than zero to be zero and every element above 255 will be forced down to 255.

eg. x = (-1,7,255,299) => (0,7,255,255)

Is there a not too complicated one-liner that can accomplish this?

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  • Perhaps you should change the title of this question to more accurately reflect your specific problem. Commented Aug 13, 2011 at 6:26

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The answer is numpy.clip

numpy.clip(x, 0, 255)

Regarding the question posted in your title: don't. You can apply the lambda function to every element, using vectorize but that's rarely the best choice.

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2 Comments

Technically, @senderle answered my question but clip is noticeably faster.
@Dex, that's because you asked the wrong question.

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