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Re: Simple question about the '>' sign. [message #69698 is a reply to message #69697]

Mon, 01 February 2010 14:55

R.G.Stockwell
Messages: 163
Registered: October 2004

Senior Member

> munka writes:
>
>> I came across this line:
>>
>> Y=( B - A*6)>0.
>>
>> is this equal to:
>>
>> Y=B - A*6
>> index=where( Y lt 0., ct)
>> if ct ne 0 then Y[index]=0.
>
> No, this is the "greater than" operator. It compares
> the two values on either side of the operator and returns
> the largest of the two.
>
>> Also, is the decimal point after the 0 significant?

actually, it could force Y to be a float array, rather than an int array.
(if a and b are ints)

IDL> help,( b - a*6) > 0
<Expression> INT = Array[10]
IDL> help,( b - a*6) > 0.
<Expression> FLOAT = Array[10]

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[Message index]

		Re: Simple question about the '>' sign. By: Wout De Nolf on Wed, 03 February 2010 02:12
		Re: Simple question about the '>' sign. By: munka on Tue, 02 February 2010 20:52
		Re: Simple question about the '>' sign. By: Kenneth P. Bowman on Tue, 02 February 2010 07:23
		Re: Simple question about the '>' sign. By: David Fanning on Mon, 01 February 2010 15:02
		Re: Simple question about the '>' sign. By: R.G.Stockwell on Mon, 01 February 2010 14:55
		Re: Simple question about the '>' sign. By: David Fanning on Sat, 30 January 2010 16:25
		Re: Simple question about the '>' sign. By: wlandsman on Sat, 30 January 2010 13:39
		Re: Simple question about the '>' sign. By: David Fanning on Sat, 30 January 2010 12:38

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