Re: Array.deleteElement within macro language

Posted by Kenneth Sloan-2 on
URL: http://imagej.273.s1.nabble.com/Array-deleteElement-within-macro-language-tp5021937p5021942.html

I'm not a macro language user, but I'm curious: how does Array.delete(a1,3) know that the '3' is an index and not a value?
Please forgive me if this is obvious.

(perhaps Arrays cannot hold integer values??)

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Kenneth Sloan
[hidden email]
Vision is the art of seeing what is invisible to others.

> On Mar 29, 2019, at 11:09, Wayne Rasband <[hidden email]> wrote:
>
>> 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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