Is this behavior expected?

[kuentang]

KDB+ 3.3 2015.11.03 Copyright (C) 1993-2015 Kx Systems    

q)f:{x}                                                   

q).[f;(),1]                                               

1                                                          

q).[f;(),1;{`$x}]                                         

1                                                         

q).[`f;(),1]                                               

1                                                         

q).[`f;(),1;{`$x}]   / imho: this should not throw an error

'type                                                     

Kim                       

[quintanar401]

Yes, .[fn;arg;errFn] is a catch block and it requires a real fn not its name,  otherwise the meaning of this statement would be unclear - is it a catch block or unary function application to the global:

f:{x}

.[`f;();{x 1}]

q)f
1

WBR, Andrey Kozyrev.

суббота, 9 января 2016 г., 20:03:17 UTC+3 пользователь kuentang написал:

KDB+ 3.3 2015.11.03 Copyright (C) 1993-2015 Kx Systems    

q)f:{x}                                                   

q).[f;(),1]                                               

1                                                          

q).[f;(),1;{`$x}]                                         

1                                                         

q).[`f;(),1]                                               

1                                                         

q).[`f;(),1;{`$x}]   / imho: this should not throw an error

'type                                                     

Kim                       

[kuentang]

Yes, the night was too long and forgot that dot with three arguments can also mean functional application.

Actually this breaks my bt library:  https://github.com/kimtang/btlib-bt

Thanks,

Kim

Von: personal-kdbplus@googlegroups.com [mailto:personal-kdbplus@googlegroups.com] Im Auftrag von Andrew Kozyrev
Gesendet: Montag, 11. Januar 2016 11:51
An: Kdb+ Personal Developers
Betreff: [personal kdb+] Re: Is this behavior expected?

Yes, .[fn;arg;errFn] is a catch block and it requires a real fn not its name,  otherwise the meaning of this statement would be unclear - is it a catch block or unary function application to the global:

f:{x}

.[`f;();{x 1}]

q)f
1

WBR, Andrey Kozyrev.

суббота, 9 января 2016 г., 20:03:17 UTC+3 пользователь kuentang написал:

KDB+ 3.3 2015.11.03 Copyright (C) 1993-2015 Kx Systems    

q)f:{x}                                                   

q).[f;(),1]                                               

1                                                          

q).[f;(),1;{`$x}]                                         

1                                                         

q).[`f;(),1]                                               

1                                                         

q).[`f;(),1;{`$x}]   / imho: this should not throw an error

'type                                                     

Kim                       

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