5

I have a function f[m,n] and a list of arguments args = {{m1,n1},{m2,n2},{m3,n3},{m4,n4}, ...} that I want to apply to it. I tried f/@args, but this yields {f[{m1,n1}], ...}. Is there a more elegant solution than defining the function as f[{m,n}]?

H.v.M.
  • 1,093
  • 5
  • 12

4 Answers4

7
args = {{m1, n1}, {m2, n2}, {m3, n3}, {m4, n4}};

f @@@ args

{f[m1, n1], f[m2, n2], f[m3, n3], f[m4, n4]}

Apply[f, args, {1}]

{f[m1, n1], f[m2, n2], f[m3, n3], f[m4, n4]}

f @@ # & /@ args

{f[m1, n1], f[m2, n2], f[m3, n3], f[m4, n4]}

f[Sequence @@ #] & /@ args

{f[m1, n1], f[m2, n2], f[m3, n3], f[m4, n4]}

% == %% == %%% == %%%%

True

Bob Hanlon
  • 157,611
  • 7
  • 77
  • 198
5
args = {{m1, n1}, {m2, n2}, {m3, n3}, {m4, n4}};

Since V 13.1 we could also MapApply

MapApply[f] @ args

{f[m1, n1], f[m2, n2], f[m3, n3], f[m4, n4]}

And since V 14.0 ComapApply to apply more than one function

ComapApply[{f, g}] /@ args

{{f[m1, n1], g[m1, n1]}, {f[m2, n2], g[m2, n2]}, {f[m3, n3], g[m3, n3]}, {f[m4, n4], g[m4, n4]}}

For versions prior to 14.0:

Query[All, Apply /@ {f, g}] @ args

{{f[m1, n1], g[m1, n1]}, {f[m2, n2], g[m2, n2]}, {f[m3, n3], g[m3, n3]}, {f[m4, n4], g[m4, n4]}}

eldo
  • 67,911
  • 5
  • 60
  • 168
2

In addition:

args = {{m1, n1}, {m2, n2}, {m3, n3}, {m4, n4}};

MapThread[f, Transpose@args]


(* {f[m1,n1],f[m2,n2],f[m3,n3],f[m4,n4]} *)
user1066
  • 17,923
  • 3
  • 31
  • 49
2

An alternative is to use BlockMap:

args = {{m1, n1}, {m2, n2}, {m3, n3}, {m4, n4}};

BlockMap[Sequence @@ f @@@ # &, args, 2]


({f[m1, n1], f[m2, n2], f[m3, n3], f[m4, n4]})
E. Chan-López
  • 23,117
  • 3
  • 21
  • 44