Qfyilyi

Here's the expected output:

{{a, b}, {c, d}, {e, f}} * {3, 4} = {{3a, 4b}, {3c, 4d}, {3e, 4f}}

However, the code above will multiply each element of the encompassing list (3 elements) by {3, 4} (2 elements) and cause an error.

I've tried defining a function and using Map, but I'm sure there's a more elegant way of doing this speedily, without needing to first define a function.

{3, 4} # & /@ {{a, b}, {c, d}, {e, f}}

{{3 a, 4 b}, {3 c, 4 d}, {3 e, 4 f}}

Alternative forms:

Map[{3, 4} # &][{{a, b}, {c, d}, {e, f}}]

{{3 a, 4 b}, {3 c, 4 d}, {3 e, 4 f}}

Map[{3, 4} # &, {{a, b}, {c, d}, {e, f}}]

{{3 a, 4 b}, {3 c, 4 d}, {3 e, 4 f}}

{{a, b}, {c, d}, {e, f}}.DiagonalMatrix[{3, 4}]

{{3 a, 4 b}, {3 c, 4 d}, {3 e, 4 f}}

Dear @WeavingBird1917 you can use Table for your purpose.

list={{a, b}, {c, d}, {e, f}};



result=Table[

{3*list[[i,1]],4*list[[i,2]]}

,{i,1,Length[list]}

]

If you want to change multiplication with summation, subtraction or division, you need only change the * sign with +, - or /.