Find indices in accumarray syntax

How can I find the indices in the accumarray syntax below, Thanks in advance

 accumarray(OrbNO,elev,[],@(x) max(x)-min(x), 0);

[Oday Shahadh]

You are great Walter.. Thanks

Answer 1

[Walter Roberson]

function idx = maxidx(x)
  [~, idx] = max(x);

function idx = minidx(x)
  [~, idx] = min(x);

Together with

 accumarray(OrbNO,elev,[],@(x) maxidx(x)-minidx(x), 0);