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Re: A simple DLM question [message #81213]

Wed, 29 August 2012 11:16

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 8/29/12 11:50 AM, Chris Torrence wrote:
> On Wednesday, August 29, 2012 11:31:39 AM UTC-6, fawltyl...@gmail.com wrote:
>>
>> A '-' can be both unary (-3) and binary (a-3). Including the '-' in the constant would be erroneous in the binary case and you would get a syntax error.
>>
>> There is a similar feature (or bug?) in parsing the exponent of floating point literals. IDL accepts 1e- as a valid float number:
>>
>> IDL> help, 1e-
>> <Expression> FLOAT = 1.00000
>>
>> But this results in a syntax error for expressions like 1e-a:
>>
>> IDL> a=0 & help, 1e-a
>>
>> a=0 & help, 1e-a
>> ^
>> % Syntax error.
>>
>> (I think 1e- should be invalid and 1e-a should be valid.)
>>
>> regards,
>> Lajos
>
> This is the one that always drives me nuts:
> IDL> a = 3
> IDL> help,1d+a
> % Syntax error.
> IDL> help,1d + a
> <Expression> DOUBLE = 4.0000000
>
> What kind of crazy language requires spaces to work properly?!
> [Three cheers for whoever answers this question first! And IDL doesn't count...]
>
> -Chris

Python! (Although you can use tabs as long as you are consistent.)

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
Research Mathematician
Tech-X Corporation

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[Message index]

		Re: A simple DLM question By: Michael Galloy on Wed, 29 August 2012 11:16
		Re: A simple DLM question By: chris_torrence@NOSPAM on Wed, 29 August 2012 10:50
		Re: A simple DLM question By: Lajos Foldy on Wed, 29 August 2012 10:31
		Re: A simple DLM question By: Xin Tao on Wed, 29 August 2012 09:23
		Re: A simple DLM question By: chris_torrence@NOSPAM on Wed, 29 August 2012 08:55
		Re: A simple DLM question By: Xin Tao on Tue, 28 August 2012 22:03
		Re: A simple DLM question By: Craig Markwardt on Tue, 28 August 2012 18:10
		Re: A simple DLM question By: Xin Tao on Tue, 28 August 2012 14:16
		Re: A simple DLM question By: Jim Pendleton on Tue, 28 August 2012 09:06
		Re: A simple DLM question By: Xin Tao on Mon, 27 August 2012 15:08
		Re: A simple DLM question By: Xin Tao on Mon, 27 August 2012 15:04
		Re: A simple DLM question By: Craig Markwardt on Mon, 27 August 2012 13:51
		Re: A simple DLM question By: Jim Pendleton on Mon, 27 August 2012 13:48

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