MATLAB: Extracting numbers from a cell

cell arrays

SP={{{1,4,5,6},{2},{3}}}
SP =
  1×1 cell array
{1×3 cell}
d=SP{1}
d =
  1×3 cell array
    {1×4 cell}    {1×1 cell}    {1×1 cell}
d{1}
ans =
  1×4 cell array
    {[1]}    {[4]}    {[5]}    {[6]}
I want d{1} to be
1 4 5 6
to be able to use these as indices of a matrix.

Best Answer

d = SP{:}
>>[d{1}{:}]
1     4     5     6
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