Re: Array.deleteElement within macro language

Posted by Wayne Rasband-2 on
URL: http://imagej.273.s1.nabble.com/Array-deleteElement-within-macro-language-tp5021937p5021941.html

> On Mar 27, 2019, at 7:06 AM, Philippe CARL <[hidden email]> wrote:
>
> Dear all,
>
> Would there be an interest for having an "Array.deleteElement(array, index)"
> entry within the macro language methods?

Thanks to Norbert Vischer, the ImageJ 1.52o7 daily build adds an Array.delete(array,value) macro function that can be used to delete array elements by value or by index.

Here is an example:

  // delete using a value
   a1 = Array.getSequence(10);
   Array.reverse(a1);
   without3 = Array.delete(a1, 3);

   // delete using indexes
   a2 = Array.getSequence(10);
   a22 = Array.copy(a2);
   a22[5] = NaN;
   a22[6] = NaN;
   without5and6 = Array.delete(a22, NaN);

   // delete using string value
   a3= newArray("one", "two", "three", "four");
   withoutTwo = Array.delete(a3, "two");

   Array.show(a1, without3, a2, without5and6, a3, withoutTwo);

-wayne

> Such deletion could be performed with the code below, but could not be too
> easy to figure out:
>
>                function ArrayDeleteElement(array, index)
>
>                {
>
>                               return Array.concat(Array.slice(array, 0,
> index - 1), Array.slice(array, index, array.length));
>
>                }
>
> My best regards,
>
> Philippe

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