Re: [basex-talk] increment a variable only when a conditional is true?

[thufir]

Hi Bridger,

Yes, this may very well.  I'll dive into it later today or tomorrow. 
The difficulty for me will be to decrement only if a conditional.  But, 
that may very well suffice.

If so, it will give the data some structure through attributes.

Then, I can use those attributes.


Thanks,

Thufi

On 2020-02-19 7:57 a.m., Bridger Dyson-Smith wrote:
Hi Thufir -

Maybe something like this will help?

```
xquery version "3.1";

let $y := 99

for $x in (1 to 9)
count $iterator
let $decrease := $y - $iterator
return(
   comment { "iterator = " ||  $iterator },
   comment { "decrease = " || $decrease },
   <xy x='{ $x }' y='{ $decrease }'/>
)
```

I'm basically ripping Walmsley's book off for this example -- see pages 
~135-7 (examples P-6,7). The `count` clause makes this work.

Best,
Bridger

PS Remember, the first step in avoiding a *trap* is knowing of its 
existence. :)

On Wed, Feb 19, 2020 at 10:33 AM thufir <hawat.thu...@gmail.com 
<mailto:hawat.thu...@gmail.com>> wrote:

    How do I decrement y?

    Pardon, output for a simpler example:

    <xy x="1" y="98"/>
    <xy x="2" y="98"/>
    <xy x="3" y="98"/>
    <xy x="4" y="98"/>
    <xy x="5" y="98"/>
    <xy x="6" y="98"/>
    <xy x="7" y="98"/>
    <xy x="8" y="98"/>
    <xy x="9" y="98"/>

    the FLWOR:

    xquery version "3.0";
    let $y := 99
    for $x in (1 to 9)
       let $y := $y - 1
    return <xy x='{$x}' y='{$y}' />


    is it not possible to decrement $y without using some external
    scripting
    function?  That seems odd.


    thanks,

    Thufir