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Re: Feature request: printing very long arrays [message #91257 is a reply to message #91127]

Tue, 23 June 2015 11:22

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Hello,

I do this a lot too but my approach is:

IDL> verybigvariable=dindgen(1000000)
IDL> print, verybigvariable[0:10]
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000 5.0000000 6.0000000 7.0000000
8.0000000 9.0000000 10.000000
IDL> print, verybigvariable[-10:-1]
999990.00 999991.00 999992.00 999993.00
999994.00 999995.00 999996.00 999997.00
999998.00 999999.00

That seems a lot simpler than requesting/supplying a keyword for a PRINT
statement.

What if you want to look at the middle part of the array, e.g.

IDL> n=n_elements(verybigvariable)
IDL> print, verybigvariable[n/2-5:n/2+5]

What would the PRINT keyword be?

IDL> print, veryBigVariable, /TruncatedPrint, $
Location="middle", NumberToPrint=20

(ha ha)

Why not write you own "Inspect" procedure to implement this type of
thing? Then simply teach yourself to type "Inspect" rather than "Print",

IDL> Inspect, verybigvariable

?

cheers,

paulv

On 06/08/15 08:48, Helder wrote:
> Hi, I don't know if this happens only to me, but sometimes while
> debugging I like to look at what's inside a variable. Most of the
> times I use the command:
>
> help, variable
>
> and sometimes
>
> print, variable
>
> However, sometimes I'm too eager to look at what's hidden under the
> name and I go directly for the print option. And if I'm so stupid to
> do that on array of say 4096 x 4096 elements... well it takes a while
> and the only way to stop this useless overflow of data is to kill the
> IDL process.
>
> Is there a chance we a print command that looks like this:
>
> IDL> print, veryBigVariable [ 0 1 ... 999998
> 999999]
>
> and IDL> print, veryBigVariable, /fullPrint 0 1 2 3
> 4 5 6 7 8 9 10 11 12
> 13 14 15 16 17 18 19 20 21
> 22 23 24 25 26 27 28 29 30
> 31 32 33 34 35 36 37 38 39 40
> 41 42 43 44 45 46 47 48 49
> 50 51 52 53 54 55 56 57 58
> 59 60 61 62 63 64 65 ....
>
> well you got the point.
>
> Any chance of this showing up in the future?
>
> Cheers, Helder
>

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[Message index]

		Feature request: printing very long arrays By: Helder Marchetto on Mon, 08 June 2015 05:48
		Re: Feature request: printing very long arrays By: optiksguy on Tue, 09 June 2015 06:43
		Re: Feature request: printing very long arrays By: Lajos Foldy on Tue, 09 June 2015 08:57
		Re: Feature request: printing very long arrays By: Helder Marchetto on Wed, 10 June 2015 00:56
		Re: Feature request: printing very long arrays By: wlandsman on Tue, 09 June 2015 10:03
		Re: Feature request: printing very long arrays By: Paul Van Delst[1] on Tue, 23 June 2015 11:22
		Re: Feature request: printing very long arrays By: Helder Marchetto on Wed, 24 June 2015 04:13

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