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Last Post 25 Mar 2016 03:31 PM by  anon
Differences between > and GT or < and LW
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anon



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25 Mar 2016 03:31 PM
    Hi everyone, I am trying to use the where function and i have found a dilema. My results are differents if i use the > than if i use GT. I had read the IDL online help but i don't understand the difference. I think where I use the > symbol, the values lower than the condition are set equal to the condition and with GT the values lower than the condition are ignored, isn't it? Thank you in advice.

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    08 Apr 2016 11:42 AM
    Hi, I don't use the '>' symbolic version much, but I do use the GT and friends (EQ, GE, LT...) quite a bit and its my understanding that the character version returns a true/false. The example I'm thinking of is if you have a float image and you give it 'b1 gt 0.5', the result will be a binary image with all pixels that met the condition as 1 and all that failed as 0. I hope that helps a bit. Laura
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