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Trying to delete small elements from a list with

copy = DeleteCases[copy, {y_} /; y <= 1500.0 ] 

but it does not work.

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closed as off-topic by Kuba, bobthechemist, Artes, RunnyKine, belisarius May 23 at 17:13

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question cannot be answered without additional information. Questions on problems in code must describe the specific problem and include valid code to reproduce it. Any data used for programming examples should be embedded in the question or code to generate the (fake) data must be included." – Kuba, bobthechemist, Artes, RunnyKine
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Is your data actually a list of single element lists? That's what your code addresses... –  rasher May 23 at 11:22
2  
Welcome to mathematica.stackexchange.com! It's hard to answer you question unless you provide info on how copy looks. However, you might try DeleteCases[copy, y_ /; y <= 1500.0]. –  Akater May 23 at 11:24
2  
What rasher is saying is: The default value for levelspec in DeleteCases is {1}. –  Kuba May 23 at 11:31

1 Answer 1

I'm guessing that your code didn't work because you have a list of approximate numbers, like so,

SeedRandom[1]; data = RandomReal[2000., 5]
{1634.78, 222.839, 1579.05, 375.606, 482.722}

and not a list of form {{1634.78}, {222.839}, ..., {482.722}}. Presuming that I've guessed right, there are two straight-forward ways to remove the numbers less than 1500.

DeleteCases[data, x_ /; x <= 1500.]
Select[data, # > 1500. &]

Both will return

{1634.78, 1579.05}

I would use Select.

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