How to make sure all the elements in an array are less than certain value?

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raghavendra kandukuri 2018-12-18

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评论： raghavendra kandukuri 2018-12-19

I have an array of type double (name= speed) and it has 72000 values, and i want to write a condition that if any of the elements in speed are less than '800' then do certain calculations, if it is greater than '800' then do certain caluclations

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Image Analyst 2018-12-18

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编辑：James Tursa 2018-12-19

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Let's say you want to multiply by 2 if less than 800, and divide by 4 otherwise. Create a mask, then do the assignment of the new values.

mask = speed < 800;
speed(mask) = speed(mask) * 2;
% ~mask (tilde mask) inverts mask and selects speed >= 800
speed(~mask) = speed(~mask) / 4; % fixed typo